Barbed fitting
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Fraction to Millimeter Conversion Table
| Fraction | Decimal | Millimeter (mm) |
|---|---|---|
| 1/2 | 0.5 | 500 |
| 1/3 | 0.333... | 333.33 |
| 2/3 | 0.666... | 666.67 |
| 1/4 | 0.25 | 250 |
| 3/4 | 0.75 | 750 |
| 1/5 | 0.2 | 200 |
| 2/5 | 0.4 | 400 |
| 3/5 | 0.6 | 600 |
| 4/5 | 0.8 | 800 |
| 1/6 | 0.166... | 166.67 |
| 5/6 | 0.833... | 833.33 |
| 1/8 | 0.125 | 125 |
| 3/8 | 0.375 | 375 |
| 5/8 | 0.625 | 625 |
| 7/8 | 0.875 | 875 |
| 1/9 | 0.111... | 111.11 |
Method A — Barbed Fitting (Most Common)
Barbed fittings grip tubing using ridges.
-
Steps:
- Find a barbed nozzle adapter matching the tube’s inner diameter (ID 6 mm).
- Push the tube onto the barb until it fully covers the ridges.
- Optionally add a hose clamp for extra security.
- Advantages: Simple, reliable for pressure under ~2–3 bar.
Example:
For ID 6 mm tubing, use a 6 mm barbed nozzle adapter.
Method B — Compression Fitting
Compression fittings create a tight seal without clamps.
-
Steps:
- Insert the tube into the fitting.
- Tighten the compression nut to seal.
- Advantages: Good for high pressure, removable.
- Disadvantages: Requires matching fitting size and nut.
Method C — Threaded Adapter with Tube Connector
If the nozzle has a threaded output:
- Use a threaded adapter.
- Attach a barbed or compression fitting.
- Attach tubing.
Method D — Quick-Connect Fittings
Useful if frequent disconnection is needed.
- Steps: Push the tube into a quick-connect nozzle adapter until it clicks.
- Advantages: Fast connection/disconnection.
3. Extra Tips
- Match ID 6 mm for the fitting/barb size for an OD 8 mm, ID 6 mm tube.
- Use a hose clamp for high pressure or vibration.
- Lubricate the tube end with a small amount of water or silicone grease to make fitting easier.
- Cut tubing squarely for a tight seal.
Summary Table:
| Method | Pros | Cons |
|---|---|---|
| Barbed | Simple, reliable, inexpensive | Needs hose clamp for high pressure |
| Compression | High pressure capable, removable | Requires fitting & nut |
| Threaded | Versatile | Needs adapter |
| Quick-Connect | Fast disconnection | Higher cost |
common tube fitting
