mechanics-dat/mechanical-parts-dat/mechanical-parts-dat.md
... ...
@@ -3,7 +3,7 @@
3 3
4 4
5 5
6
-
6
+- [[screw-dat]]
7 7
8 8
- [[gear-dat]] - [[bearing-dat]] - [[bracket-dat]]
9 9
mechanics-dat/mechanical-parts-dat/screw-dat/2025-03-07-17-10-00.png
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-M3-dat/screw-M3-dat.md
... ...
@@ -0,0 +1,4 @@
1
+
2
+# screw-M3-dat
3
+
4
+- nut - perpendicular distance - 7
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-M4-dat/screw-M4-dat.md
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1
+
2
+# screw-M4-dat
3
+
4
+- nut - perpendicular distance - 8 mm
5
+- chamer == 2 mm
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-dat.md
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@@ -0,0 +1,214 @@
1
+
2
+# screws-dat
3
+
4
+- [[screws]]
5
+
6
+
7
+- [[screw-large-head-dat]]
8
+
9
+- M3x10
10
+- M5x10
11
+
12
+- M16
13
+- M25 == ￠25*M20*200(1颗)
14
+- M100螺栓 150mm-800mm == 240
15
+- M120螺栓 200mm-800mm
16
+
17
+- [[hex-key-dat]]
18
+
19
+## common combination
20
+
21
+- [[screws-dat]] + [[nut-dat]] + [[washer-spring-dat]] + [[washer-flat-dat]]
22
+
23
+![](2025-09-25-18-25-15.png)
24
+
25
+
26
+## bolt and screw
27
+
28
+| Feature | Bolt | Screw |
29
+| --------------------- | -------------------------------------------------- | ------------------------------------------------------------------- |
30
+| **Usage** | Used with a **nut** or threaded hole | Often used **without a nut**, threads into material directly |
31
+| **Holding Mechanism** | Relies on **external nut** for clamping force | Creates clamping force by threading directly into the material |
32
+| **Tools Used** | Typically needs a **wrench** or **socket** | Often driven by **screwdriver** or **Allen key** |
33
+| **Installation** | Requires access to **both sides** (to tighten nut) | Can often be installed from **one side** only |
34
+| **Thread Type** | Usually has a **blunt end** and uniform threads | Often has **pointed or tapered end**, cutting threads into material |
35
+| **Common Example** | Hex bolt with nut on the other end | Wood screw going into wood directly |
36
+
37
+
38
+
39
+## fit size
40
+
41
+### Common Screw Size Reference
42
+
43
+| Item | M3 | M4 |
44
+| ------------------------------------ | ---------- | ------- |
45
+| **Screw Shaft Diameter** | 3.0 mm | 4.0 mm |
46
+| **Button/Socket Head Diameter** | 5.5–6.0 mm | 7.0 mm |
47
+| **Countersunk Head Diameter** | ~5.6 mm | ~7.5 mm |
48
+| **Washer Outer Diameter (standard)** | 6.0 mm | 8.0 mm |
49
+
50
+## common used bolt
51
+
52
+- hex head bolt
53
+- hex socket head bolt
54
+- Phillips Head Screw
55
+
56
+
57
+## Screw == Self-tapping Screws
58
+
59
+Self-tapping screws are designed to create their own hole as they are driven into the material. They are commonly used in metal, plastic, and wood applications. The most common types of self-tapping screws include:
60
+
61
+## Other Head Types
62
+
63
+### Round head
64
+
65
+6. Round Head
66
+Name: Round Head Screw
67
+Description: Fully rounded top, offering a decorative or smooth finish.
68
+Usage: Less common in screws but used in vintage or decorative applications.
69
+
70
+
71
+### Pan head
72
+
73
+Pan Head Screws M3*6, note length is the screws part
74
+
75
+![](2025-03-07-17-10-00.png)
76
+
77
+4. Pan Head
78
+Name: Pan Head Screw
79
+Description: Rounded, slightly raised head with a large diameter.
80
+Usage: Common in electronics, sheet metal fastening, and general applications.
81
+
82
+
83
+
84
+### Countersunk Head
85
+
86
+Countersunk Head M3*6, note length is the total length
87
+
88
+![](2025-03-07-17-11-52.png)
89
+
90
+
91
+### Hex Head
92
+
93
+
94
+
95
+### Hex socket
96
+
97
+![](2025-03-13-18-03-58.png)
98
+
99
+
100
+
101
+### Button Head
102
+
103
+M5*10 pan head
104
+
105
+![](2025-03-11-16-36-15.png)
106
+
107
+2. Button Head (Socket Button Head Screw)
108
+Name: Button Head Screw
109
+Description: Low-profile, rounded head with a wide bearing surface.
110
+Usage: Used when a smooth, low-profile finish is needed, such as in enclosures or furniture.
111
+
112
+
113
+### Cap Head
114
+
115
+1. Cap Head (Socket Cap Screw)
116
+Name: Cap Head Screw
117
+Description: Tall, cylindrical head with a deep hex socket.
118
+Usage: High-strength fastening in machinery, automotive, and structural applications.
119
+
120
+### Flat Head
121
+
122
+3. Flat Head (Countersunk Head Screw)
123
+Name: Flat Head Screw
124
+Description: Tapered, countersunk head that sits flush with the surface.
125
+Usage: Used in applications requiring a smooth, flush surface, such as aerospace or furniture.
126
+
127
+### Low Head
128
+
129
+5. Low Head
130
+Name: Low Head Screw
131
+Description: Similar to cap head but with a reduced height for tight spaces.
132
+Usage: Used in applications where clearance is limited but a strong connection is needed.
133
+
134
+### Truss Head
135
+
136
+7. Truss Head
137
+Name: Truss Head Screw
138
+Description: Extra-wide, low-profile head for better load distribution.
139
+Usage: Used in thin materials like sheet metal or plastic to reduce material damage.
140
+
141
+### Oval Head
142
+
143
+8. Oval Head (Raised Countersunk Head Screw)
144
+Name: Oval Head Screw
145
+Description: Similar to a flat head but with a slightly domed top.
146
+Usage: Decorative applications or when a smooth, elegant look is needed.
147
+
148
+## Drive Types
149
+
150
+
151
+Screws can be categorized based on their **drive type**, which refers to the shape of the socket or recess in the screw head where the tool engages.
152
+
153
+### 1. Hex Drive (Allen)
154
+- **Common Names:** Hex Socket, Allen
155
+- **Description:** A hexagonal socket that requires a hex key (Allen wrench).
156
+- **Usage:** Used in machinery, furniture, and automotive applications for high torque fastening.
157
+
158
+### 2. Phillips Drive (Cross)
159
+- **Common Names:** Phillips, Cross Recess
160
+- **Description:** A cross-shaped recess designed to prevent over-tightening.
161
+- **Usage:** Widely used in general-purpose applications, especially in wood and drywall screws.
162
+
163
+### 3. Slotted Drive
164
+- **Common Names:** Slot, Flathead
165
+- **Description:** A single straight groove that uses a flat-blade screwdriver.
166
+- **Usage:** Common in older designs, electrical outlets, and light-duty applications.
167
+
168
+### 4. Torx Drive
169
+- **Common Names:** Torx, Star
170
+- **Description:** A six-pointed star-shaped recess that provides high torque transfer and reduces cam-out.
171
+- **Usage:** Used in electronics, automotive, and aerospace applications.
172
+
173
+### 5. Pozidriv Drive
174
+- **Common Names:** Pozidriv, PZ
175
+- **Description:** Similar to Phillips but with extra grooves for better torque and less slippage.
176
+- **Usage:** Common in European woodworking and electrical applications.
177
+
178
+### 6. Square Drive (Robertson)
179
+- **Common Names:** Robertson
180
+- **Description:** A square-shaped recess that offers strong torque resistance and prevents cam-out.
181
+- **Usage:** Used in construction, woodworking, and some automotive applications.
182
+
183
+### 7. Tri-Wing Drive
184
+- **Common Names:** Tri-Wing
185
+- **Description:** Three-winged recess designed for security screws.
186
+- **Usage:** Found in aerospace, electronics, and tamper-proof applications (e.g., Nintendo consoles).
187
+
188
+### 8. Spanner Drive (Snake Eye)
189
+- **Common Names:** Spanner, Snake Eye, Twin-Hole
190
+- **Description:** Two small round holes on the head requiring a special spanner bit.
191
+- **Usage:** Used in security screws to prevent tampering in public spaces.
192
+
193
+### 9. One-Way Drive
194
+- **Common Names:** One-Way, Security Slot
195
+- **Description:** Slotted design that allows installation but prevents removal.
196
+- **Usage:** Used in security applications like restroom fixtures and license plates.
197
+
198
+### 10. Hexalobular Drive (Torx Plus)
199
+- **Common Names:** Torx Plus, 6-Lobe
200
+- **Description:** A refined version of Torx with a more precise shape for higher torque.
201
+- **Usage:** Found in automotive, aerospace, and industrial applications.
202
+
203
+### 11. Clutch Drive
204
+- **Common Names:** Clutch Head
205
+- **Description:** Bowtie-shaped recess used in heavy machinery.
206
+- **Usage:** Found in buses, trailers, and some older appliances.
207
+
208
+
209
+
210
+## ref
211
+
212
+- [[nut-dat]]
213
+
214
+- [[screws]]
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-large-head-dat/2025-12-30-14-50-19.png
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-large-head-dat/screw-large-head-dat.md
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1
+
2
+# screw-large-head-dat.md
3
+
4
+![](2025-12-30-14-50-19.png)
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-pan-head-dat/2025-12-17-21-41-37.png
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mechanics-dat/mechanical-parts-dat/screw-dat/screw-pan-head-dat/screw-pan-head-dat.md
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1
+
2
+# screw-pan-head-dat
3
+
4
+![](2025-12-17-21-41-37.png)
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mechanics-dat/mechanical-structure-dat/Shaft-dat/Shaft-dat.md
... ...
@@ -9,7 +9,7 @@
9 9
10 10
- 8mm
11 11
12
-- 6mm - [[3d-printer-dat]]
12
+- 6mm - [[3d-printer-dat]] use shaft holder == 6.35 with screws
13 13
14 14
15 15
mechanics-dat/mechanical-structure-dat/belt-sys-dat/idler-dat/idler-dat.md
... ...
@@ -1,10 +0,0 @@
1
-
2
-# idler-dat
3
-
4
-## GT2_Idler_20T_5B_6mm
5
-
6
-
7
-
8
-## ref
9
-
10
-- [[idler]]
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\ No newline at end of file
mechanics-dat/mechanical-structure-dat/belt-sys-dat/pulley-dat/2025-04-11-16-38-50.png
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mechanics-dat/mechanical-structure-dat/belt-sys-dat/pulley-dat/pulley-dat.md
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1
+
2
+# timing-pulley-dat
3
+
4
+
5
+
6
+- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]
7
+
8
+
9
+| modes | category | teeth | inner diameter | belt width | note |
10
+| :------------- | :------- | :---- | :------------- | :--------- | :---: |
11
+| GT2_20T_8B_6mm | 2GT | 20 | 8 | 6 | - |
12
+
13
+
14
+
15
+
16
+### GT2_Timing_Pulley_20T_8B_6mm v8
17
+
18
+The **GT2 Timing Pulley 20T 8B 6mm (v8)** refers to a specific type of timing pulley used in belt-driven motion systems, often found in 3D printers, CNC machines, and other precision mechanical setups. Here’s a breakdown of its specifications:
19
+
20
+- **GT2**: Refers to the pulley type designed for **GT2 timing belts**, which have a 2mm pitch (distance between teeth). This type is commonly used in applications requiring precise movement and low backlash.
21
+- **Timing Pulley**: A mechanical component with teeth that engage with a timing belt to transfer motion with high accuracy.
22
+- **20T**: This pulley has **20 teeth**, which affects the step resolution and speed of the driven mechanism.
23
+- **8B**: Indicates an **8mm bore diameter**, meaning it fits shafts with an 8mm diameter.
24
+- **6mm**: This refers to the **belt width** it is compatible with, which is typically a **6mm-wide GT2 timing belt**.
25
+- **v8**: This likely refers to the **version** or **design iteration** of the pulley.
26
+
27
+This pulley is commonly used in precise motion control applications like 3D printing, where smooth and accurate belt-driven motion is needed. Let me know if you need further details! 🚀
28
+
29
+
30
+
31
+
32
+## GT2_Timing_Pulley_20T_8B_6mm
33
+
34
+- **GT2**: Refers to the tooth profile – 2 mm pitch (distance between teeth), ideal for precise motion control (e.g., 3D printers).
35
+- **20T**: 20 Teeth – the pulley has 20 teeth around its circumference.
36
+- **8B**: 8 mm **inner bore diameter** (fits an 8 mm shaft).
37
+- **6mm**: **Belt width** – designed for 6 mm wide GT2 timing belts.
38
+
39
+## Summary:
40
+This is a 20-tooth GT2 pulley with an 8 mm bore, suitable for 6 mm belts. It's commonly used in 3D printers, CNC machines, and robotics for accurate belt-driven motion.
41
+
42
+https://cad.onshape.com/documents/707b8372a3c9ced9cde96289/v/ee73401f89c866bc22119094/e/19e0ed0d5720546e9089804c?showReturnToWorkspaceLink=true
43
+
44
+- measured witdth = 9 mm
45
+- measured hole = 5 mm
46
+
47
+![](2025-04-11-16-38-50.png)
48
+
49
+## GT2_Timing_Pulley_20T_8B_5mm
50
+
51
+the following images show inner hole 5mm, not 6mm
52
+
53
+![](2025-04-11-17-02-34.png)
54
+
55
+
56
+## timing pulley VS. Coupler
57
+
58
+### 🔧 1. Function
59
+
60
+| Aspect | **Timing Pulley** | **Idler Pulley** |
61
+| ------- | ------------------------------------------------- | ------------------------------------------------ |
62
+| Purpose | Transmits power between shafts via timing belt | Guides or maintains tension in the belt |
63
+| Motion | Rotates with and drives the shaft it's mounted on | Usually free-spinning (not connected to a motor) |
64
+
65
+---
66
+
67
+### 🔁 2. Power Transmission
68
+
69
+| Aspect | **Timing Pulley** | **Idler Pulley** |
70
+| -------------- | ----------------------------------------------- | ------------------------------------------- |
71
+| Power Transfer | Yes – transfers torque and synchronizes timing | No – only redirects or tensions the belt |
72
+| Engagement | Toothed belt fits precisely to prevent slippage | May or may not be toothed; sometimes smooth |
73
+
74
+---
75
+
76
+### ⚙️ 3. Mounting and Design
77
+
78
+| Aspect | **Timing Pulley** | **Idler Pulley** |
79
+| -------------- | -------------------------------------- | ------------------------------------------- |
80
+| Shaft Mount | Mounted on driven or driving shaft | Mounted on a stationary or pivoting bracket |
81
+| Size Variation | Chosen for gear ratio and torque needs | Chosen based on tensioning or routing needs |
82
+
83
+---
84
+
85
+#### 🛠️ Example Scenario
86
+
87
+In a **3D printer or CNC machine**, the motor uses a **timing pulley** to drive a toothed belt, while an **idler pulley** on the other side keeps the belt tight and correctly aligned.
88
+
89
+
90
+## ref
91
+
92
+- [[timing-pulley]]
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\ No newline at end of file
mechanics-dat/mechanical-structure-dat/belt-sys-dat/pulley-dat/pulley-drive-dat/2026-01-07-14-55-34.png
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mechanics-dat/mechanical-structure-dat/belt-sys-dat/pulley-dat/pulley-drive-dat/pulley-drive-dat.md
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@@ -0,0 +1,43 @@
1
+
2
+# pulley-drive-dat
3
+
4
+
5
+- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]
6
+
7
+![](2026-01-07-14-55-34.png)
8
+
9
+
10
+- 普通版（16齿高14)内孔5mm
11
+- 普通版（20齿高16)内孔5mm
12
+- 普通版（20齿高16)内孔6.35mm
13
+- 普通版（20齿高16)内孔8mm
14
+- 普通版（20齿带宽6)内孔6mm
15
+- 普通版（20齿高16)内孔4mm
16
+- 普通版（16齿高14)内孔6mm
17
+- 高品质（16齿高14)内孔5mm
18
+- 高品质（20齿高16)内孔5mm
19
+- 高品质（20齿高16)内孔6.35mm
20
+- 高品质（20齿高16)内孔8mm
21
+- 高品质（20齿带宽6)内孔6mm
22
+- 30齿内孔5mm（带宽6mm）
23
+- 30齿内孔8mm（带宽6mm）
24
+- 36齿内孔5mm（带宽6mm）
25
+- 36齿内孔6.35mm（带宽6mm）
26
+- 36齿内孔8mm（带宽6mm）
27
+- 40齿内孔6.35mm（带宽6mm）
28
+- 40齿内孔5mm（带宽6mm）
29
+- 40齿内孔8mm（带宽6mm）
30
+- 40齿内孔10mm（带宽6mm）
31
+- 40齿内孔12mm（带宽6mm）
32
+- 80齿内孔5mm（带宽6mm）
33
+- 80齿内孔5mm（带宽6mm）黑色
34
+- 40齿/内径5mm带宽10
35
+- 16齿内孔5mm高20带宽10
36
+- 20齿内孔5mm高19带宽10
37
+- 20齿内孔6.35mm高19带宽10
38
+- 20齿内孔8mm高19带宽10
39
+- 20齿内孔6.35mm带宽10外径14
40
+- M3扳手【适用16齿同步轮】
41
+- M4扳手【适用20齿及以上同步轮】
42
+
43
+
mechanics-dat/mechanical-structure-dat/belt-sys-dat/pulley-dat/pulley-idler-dat/pulley-idler-dat.md
... ...
@@ -0,0 +1,15 @@
1
+
2
+# idler-dat
3
+
4
+
5
+
6
+- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]
7
+
8
+
9
+## GT2_Idler_20T_5B_6mm
10
+
11
+
12
+
13
+## ref
14
+
15
+- [[idler]]
... ...
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mechanics-dat/mechanical-structure-dat/belt-sys-dat/timing-pulley-dat/2025-04-11-17-02-34.png
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mechanics-dat/mechanical-structure-dat/belt-sys-dat/timing-pulley-dat/timing-pulley-dat.md
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@@ -1,88 +0,0 @@
1
-
2
-# timing-pulley-dat
3
-
4
-
5
-| modes | category | teeth | inner diameter | belt width | note |
6
-| :------------- | :------- | :---- | :------------- | :--------- | :---: |
7
-| GT2_20T_8B_6mm | 2GT | 20 | 8 | 6 | - |
8
-
9
-
10
-
11
-
12
-### GT2_Timing_Pulley_20T_8B_6mm v8
13
-
14
-The **GT2 Timing Pulley 20T 8B 6mm (v8)** refers to a specific type of timing pulley used in belt-driven motion systems, often found in 3D printers, CNC machines, and other precision mechanical setups. Here’s a breakdown of its specifications:
15
-
16
-- **GT2**: Refers to the pulley type designed for **GT2 timing belts**, which have a 2mm pitch (distance between teeth). This type is commonly used in applications requiring precise movement and low backlash.
17
-- **Timing Pulley**: A mechanical component with teeth that engage with a timing belt to transfer motion with high accuracy.
18
-- **20T**: This pulley has **20 teeth**, which affects the step resolution and speed of the driven mechanism.
19
-- **8B**: Indicates an **8mm bore diameter**, meaning it fits shafts with an 8mm diameter.
20
-- **6mm**: This refers to the **belt width** it is compatible with, which is typically a **6mm-wide GT2 timing belt**.
21
-- **v8**: This likely refers to the **version** or **design iteration** of the pulley.
22
-
23
-This pulley is commonly used in precise motion control applications like 3D printing, where smooth and accurate belt-driven motion is needed. Let me know if you need further details! 🚀
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-
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-
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-
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-
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-## GT2_Timing_Pulley_20T_8B_6mm
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-
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-- **GT2**: Refers to the tooth profile – 2 mm pitch (distance between teeth), ideal for precise motion control (e.g., 3D printers).
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-- **20T**: 20 Teeth – the pulley has 20 teeth around its circumference.
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-- **8B**: 8 mm **inner bore diameter** (fits an 8 mm shaft).
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-- **6mm**: **Belt width** – designed for 6 mm wide GT2 timing belts.
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-
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-## Summary:
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-This is a 20-tooth GT2 pulley with an 8 mm bore, suitable for 6 mm belts. It's commonly used in 3D printers, CNC machines, and robotics for accurate belt-driven motion.
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-
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-https://cad.onshape.com/documents/707b8372a3c9ced9cde96289/v/ee73401f89c866bc22119094/e/19e0ed0d5720546e9089804c?showReturnToWorkspaceLink=true
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-
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-- measured witdth = 9 mm
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-- measured hole = 5 mm
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-
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-![](2025-04-11-16-38-50.png)
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-
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-## GT2_Timing_Pulley_20T_8B_5mm
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-
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-the following images show inner hole 5mm, not 6mm
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-
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-![](2025-04-11-17-02-34.png)
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-
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-
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-## timing pulley VS. Coupler
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-
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-### 🔧 1. Function
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-
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-| Aspect | **Timing Pulley** | **Idler Pulley** |
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-| ------- | ------------------------------------------------- | ------------------------------------------------ |
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-| Purpose | Transmits power between shafts via timing belt | Guides or maintains tension in the belt |
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-| Motion | Rotates with and drives the shaft it's mounted on | Usually free-spinning (not connected to a motor) |
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-
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----
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-
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-### 🔁 2. Power Transmission
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-
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-| Aspect | **Timing Pulley** | **Idler Pulley** |
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-| -------------- | ----------------------------------------------- | ------------------------------------------- |
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-| Power Transfer | Yes – transfers torque and synchronizes timing | No – only redirects or tensions the belt |
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-| Engagement | Toothed belt fits precisely to prevent slippage | May or may not be toothed; sometimes smooth |
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-
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----
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-
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-### ⚙️ 3. Mounting and Design
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-
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-| Aspect | **Timing Pulley** | **Idler Pulley** |
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-| -------------- | -------------------------------------- | ------------------------------------------- |
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-| Shaft Mount | Mounted on driven or driving shaft | Mounted on a stationary or pivoting bracket |
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-| Size Variation | Chosen for gear ratio and torque needs | Chosen based on tensioning or routing needs |
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-
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----
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-
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-#### 🛠️ Example Scenario
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-
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-In a **3D printer or CNC machine**, the motor uses a **timing pulley** to drive a toothed belt, while an **idler pulley** on the other side keeps the belt tight and correctly aligned.
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-
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-
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-## ref
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-
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-- [[timing-pulley]]
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-
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-# screws-dat
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-
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-- [[screws]]
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-
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-
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-- [[screw-large-head-dat]]
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-
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-- M3x10
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-- M5x10
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-
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-- M16
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-- M25 == ￠25*M20*200(1颗)
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-- M100螺栓 150mm-800mm == 240
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-- M120螺栓 200mm-800mm
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-
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-- [[hex-key-dat]]
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-
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-## common combination
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-
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-- [[screws-dat]] + [[nut-dat]] + [[washer-spring-dat]] + [[washer-flat-dat]]
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-
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-![](2025-09-25-18-25-15.png)
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-
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-
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-## bolt and screw
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-
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-| Feature | Bolt | Screw |
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-| --------------------- | -------------------------------------------------- | ------------------------------------------------------------------- |
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-| **Usage** | Used with a **nut** or threaded hole | Often used **without a nut**, threads into material directly |
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-| **Holding Mechanism** | Relies on **external nut** for clamping force | Creates clamping force by threading directly into the material |
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-| **Tools Used** | Typically needs a **wrench** or **socket** | Often driven by **screwdriver** or **Allen key** |
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-| **Installation** | Requires access to **both sides** (to tighten nut) | Can often be installed from **one side** only |
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-| **Thread Type** | Usually has a **blunt end** and uniform threads | Often has **pointed or tapered end**, cutting threads into material |
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-| **Common Example** | Hex bolt with nut on the other end | Wood screw going into wood directly |
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-
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-
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-
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-## fit size
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-
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-### Common Screw Size Reference
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-
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-| Item | M3 | M4 |
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-| ------------------------------------ | ---------- | ------- |
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-| **Screw Shaft Diameter** | 3.0 mm | 4.0 mm |
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-| **Button/Socket Head Diameter** | 5.5–6.0 mm | 7.0 mm |
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-| **Countersunk Head Diameter** | ~5.6 mm | ~7.5 mm |
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-| **Washer Outer Diameter (standard)** | 6.0 mm | 8.0 mm |
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-
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-## common used bolt
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-
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-- hex head bolt
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-- hex socket head bolt
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-- Phillips Head Screw
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-
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-
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-## Screw == Self-tapping Screws
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-
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-Self-tapping screws are designed to create their own hole as they are driven into the material. They are commonly used in metal, plastic, and wood applications. The most common types of self-tapping screws include:
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-
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-## Other Head Types
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-
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-### Round head
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-
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-6. Round Head
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-Name: Round Head Screw
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-Description: Fully rounded top, offering a decorative or smooth finish.
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-Usage: Less common in screws but used in vintage or decorative applications.
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-
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-
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-### Pan head
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-
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-Pan Head Screws M3*6, note length is the screws part
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-
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-![](2025-03-07-17-10-00.png)
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-
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-4. Pan Head
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-Name: Pan Head Screw
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-Description: Rounded, slightly raised head with a large diameter.
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-Usage: Common in electronics, sheet metal fastening, and general applications.
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-
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-
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-
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-### Countersunk Head
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-
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-Countersunk Head M3*6, note length is the total length
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-
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-![](2025-03-07-17-11-52.png)
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-
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-
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-### Hex Head
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-
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-
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-
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-### Hex socket
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-
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-![](2025-03-13-18-03-58.png)
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-
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-
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-
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-### Button Head
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-
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-M5*10 pan head
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-
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-![](2025-03-11-16-36-15.png)
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-
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-2. Button Head (Socket Button Head Screw)
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-Name: Button Head Screw
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-Description: Low-profile, rounded head with a wide bearing surface.
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-Usage: Used when a smooth, low-profile finish is needed, such as in enclosures or furniture.
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-
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-
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-### Cap Head
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-
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-1. Cap Head (Socket Cap Screw)
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-Name: Cap Head Screw
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-Description: Tall, cylindrical head with a deep hex socket.
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-Usage: High-strength fastening in machinery, automotive, and structural applications.
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-
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-### Flat Head
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-
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-3. Flat Head (Countersunk Head Screw)
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-Name: Flat Head Screw
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-Description: Tapered, countersunk head that sits flush with the surface.
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-Usage: Used in applications requiring a smooth, flush surface, such as aerospace or furniture.
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-
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-### Low Head
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-
129
-5. Low Head
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-Name: Low Head Screw
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-Description: Similar to cap head but with a reduced height for tight spaces.
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-Usage: Used in applications where clearance is limited but a strong connection is needed.
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-
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-### Truss Head
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-
136
-7. Truss Head
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-Name: Truss Head Screw
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-Description: Extra-wide, low-profile head for better load distribution.
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-Usage: Used in thin materials like sheet metal or plastic to reduce material damage.
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-
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-### Oval Head
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-
143
-8. Oval Head (Raised Countersunk Head Screw)
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-Name: Oval Head Screw
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-Description: Similar to a flat head but with a slightly domed top.
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-Usage: Decorative applications or when a smooth, elegant look is needed.
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-
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-## Drive Types
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-
150
-
151
-Screws can be categorized based on their **drive type**, which refers to the shape of the socket or recess in the screw head where the tool engages.
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-
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-### 1. Hex Drive (Allen)
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-- **Common Names:** Hex Socket, Allen
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-- **Description:** A hexagonal socket that requires a hex key (Allen wrench).
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-- **Usage:** Used in machinery, furniture, and automotive applications for high torque fastening.
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-
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-### 2. Phillips Drive (Cross)
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-- **Common Names:** Phillips, Cross Recess
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-- **Description:** A cross-shaped recess designed to prevent over-tightening.
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-- **Usage:** Widely used in general-purpose applications, especially in wood and drywall screws.
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-
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-### 3. Slotted Drive
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-- **Common Names:** Slot, Flathead
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-- **Description:** A single straight groove that uses a flat-blade screwdriver.
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-- **Usage:** Common in older designs, electrical outlets, and light-duty applications.
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-
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-### 4. Torx Drive
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-- **Common Names:** Torx, Star
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-- **Description:** A six-pointed star-shaped recess that provides high torque transfer and reduces cam-out.
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-- **Usage:** Used in electronics, automotive, and aerospace applications.
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-
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-### 5. Pozidriv Drive
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-- **Common Names:** Pozidriv, PZ
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-- **Description:** Similar to Phillips but with extra grooves for better torque and less slippage.
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-- **Usage:** Common in European woodworking and electrical applications.
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-
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-### 6. Square Drive (Robertson)
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-- **Common Names:** Robertson
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-- **Description:** A square-shaped recess that offers strong torque resistance and prevents cam-out.
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-- **Usage:** Used in construction, woodworking, and some automotive applications.
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-
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-### 7. Tri-Wing Drive
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-- **Common Names:** Tri-Wing
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-- **Description:** Three-winged recess designed for security screws.
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-- **Usage:** Found in aerospace, electronics, and tamper-proof applications (e.g., Nintendo consoles).
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-
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-### 8. Spanner Drive (Snake Eye)
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-- **Common Names:** Spanner, Snake Eye, Twin-Hole
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-- **Description:** Two small round holes on the head requiring a special spanner bit.
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-- **Usage:** Used in security screws to prevent tampering in public spaces.
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-
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-### 9. One-Way Drive
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-- **Common Names:** One-Way, Security Slot
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-- **Description:** Slotted design that allows installation but prevents removal.
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-- **Usage:** Used in security applications like restroom fixtures and license plates.
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-
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-### 10. Hexalobular Drive (Torx Plus)
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-- **Common Names:** Torx Plus, 6-Lobe
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-- **Description:** A refined version of Torx with a more precise shape for higher torque.
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-- **Usage:** Found in automotive, aerospace, and industrial applications.
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-
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-### 11. Clutch Drive
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-- **Common Names:** Clutch Head
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-- **Description:** Bowtie-shaped recess used in heavy machinery.
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-- **Usage:** Found in buses, trailers, and some older appliances.
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-
208
-
209
-
210
-## ref
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-
212
-- [[nut-dat]]
213
-
214
-- [[screws]]
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-# screw-large-head-dat.md
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-
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-![](2025-12-30-14-50-19.png)
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-
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-# screw-pan-head-dat
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-
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