Airtac PU Straight Fitting PU8D
The AirTAC Airtac PU Straight Fitting PU8D is a genuine straight union for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeStraight union
- SeriesPU
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PU Straight Fitting PU8D
The PU8D is an AirTAC PU straight union, a tube-to-tube one-touch fitting that joins two lengths of Dia 8 mm soft nylon or polyurethane tubing end to end in a perfectly inline splice. There is no threaded port on this part at all, so no thread sealant or port orientation matters: push each tube home and the internal chuck grips it, press the release ring to free it.
The D suffix makes the union body black, and on the PU series that colour runs through the whole body, not just the button as it does on PC connectors. This is the resin spec profile: working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature window of -20 to +70 C. The POM chuck, stainless spring gasket and NBR O-ring do the sealing work on both ends.
Airtac PU Straight Fitting PU8D Technical Specifications
| Model | Airtac PU Straight Fitting PU8D |
|---|---|
| Type | Straight union |
| Series | PU |
| Connection | Push-in one-touch |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Applicable tubing | Soft nylon or polyurethane tube |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PU Straight Fitting PU8D
| PU | Straight union. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| D | Black. Blank = grey. |
Fitting & Sealing Notes
- check Cut the tube square and clean before pushing it home, or the seal will leak.
- check Push until it stops, then pull back to check the chuck has gripped.
- check To release, press the collet ring fully in and pull the tube out.
- check Threaded parts arrive with sealant on the thread; M5 sizes use a sealing gasket.
- check Match the tube OD exactly - a 6 mm fitting will not hold 1/4" tube.
Where the Airtac PU Straight Fitting PU8D Is Used
Splicing a vibratory bowl feed line
On a bowl feeder feed track, an 8 mm drop line that arrives a metre short of the air ejector can be extended with a straight inline union instead of replacing the whole run.
Pick-and-place gantry tube runs
Long X-axis runs on a pick-and-place gantry are built from standard tube lengths; a black PU8D splice keeps the joint discreet against black machine framing and fully serviceable.
Bench pneumatic test rigs
Lab and test benches reconfigured between experiments need temporary tube joins; the release ring lets an operator re-route 8 mm lines in seconds without tools.
Is the Airtac PU Straight Fitting PU8D the Right Part?
Step down to PU6 for a Dia 6 splice feeding lighter loads such as small grippers or pilot lines, or step up to PU10 when the run supplies a larger cylinder or air tool that draws more volume; the union bore scales with the tube, so capacity tracks the OD you choose rather than any published flow figure. Bulkhead option: if the splice must pass through a panel or machine wall instead of running in free air, the PM bulkhead union is the threaded-through equivalent.
Match the tube exactly. Both ends of the PU8D hold 8 mm OD soft nylon or polyurethane only, so a nominal 1/4 in (6.35 mm) tube is too small to seat on the chuck and will leak or blow off.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
Airtac PU Straight Fitting PU8D FAQ
The PU8D is an 8 mm to 8 mm one-touch straight union with no thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure is -750 mmHg (10 Torr), proof pressure is 1.5 MPa and the temperature range is -20 to +70 C. It takes soft nylon or polyurethane tube of exactly 8 mm OD on both ends.
On the PU series the D suffix turns the union body black. It does not alter dimensions, pressure rating or materials. This differs from the PC and POC connectors, where D only swaps the release button colour, so a black PU8D blends into dark machine frames rather than standing out like the standard grey.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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