Airtac PGJ Plug Pin Reducing Straight Connector PGJ8-4
The AirTAC Airtac PGJ Plug Pin Reducing Straight Connector PGJ8-4 is a genuine plug-in reducer for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypePlug-in reducer
- SeriesPGJ
- 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 PGJ Plug Pin Reducing Straight Connector PGJ8-4
The PGJ8-4 is an AirTAC plug-in reducer, a tube-to-tube one-touch union that joins Dia 8 mm tubing on the supply side to Dia 4 mm tubing on the outlet side in a single moulded body. There is no threaded port at all: both ends are push-in sockets, so the reducer simply sits inline wherever a circuit has to step down from a main trunk line to a light-duty branch.
Each end works the same way. Push the soft nylon or polyurethane tube in until it bottoms, and the internal chuck grips the tube wall while the NBR O-ring seals around its OD; press the release ring and the tube slides free. This is the resin one-touch spec profile: 0 to 1.0 MPa working pressure, -750 mmHg vacuum capability, 1.5 MPa proof pressure and -20 to +70 C. Because there is no thread, there is no sealant and no PTFE tape to apply - the only seals are the two O-rings inside the chucks.
Airtac PGJ Plug Pin Reducing Straight Connector PGJ8-4 Technical Specifications
| Model | Airtac PGJ Plug Pin Reducing Straight Connector PGJ8-4 |
|---|---|
| Type | Plug-in reducer |
| Series | PGJ |
| 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 PGJ Plug Pin Reducing Straight Connector PGJ8-4
| PGJ | Plug-in reducer. |
|---|---|
| 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 PGJ Plug Pin Reducing Straight Connector PGJ8-4 Is Used
Pilot signal drop on a valve island
On a machine with a Dia 8 air trunk running along the frame, the PGJ8-4 steps a branch down to Dia 4 to feed solenoid pilot ports and pressure switches, where flow demand is tiny and the smaller tube routes far more neatly into the control cabinet.
Analytical instrument tubing reduction
Benchtop lab and analyser equipment often mixes Dia 8 carrier lines with Dia 4 lines to detectors and small pneumatic actuators. A push-in reducer splices the two without adapters, and the -750 mmHg vacuum rating means it also holds up on the suction side of sampling circuits.
Compact pick-and-place head
On a small robotics pick-and-place head, space above the gripper is tight. Routing the Dia 8 supply up the arm and reducing to Dia 4 with a PGJ8-4 lets the final drop to the suction cup or mini gripper use light, flexible tubing that will not fight the movement.
Is the Airtac PGJ Plug Pin Reducing Straight Connector PGJ8-4 the Right Part?
PGJ8-4 takes Dia 8 down to Dia 4, which is a fairly aggressive step. Dia 4 is the smallest tube size in this one-touch range, so there is nothing smaller below it; the next size up on the large side of the ladder is Dia 10. If a gentler reduction suits your circuit better, the PG different-diameter straight family covers other step combinations in the same resin spec profile, and PU straight unions keep a constant bore if you do not need to reduce at all.
Match tube OD exactly on both ends: the Dia 4 side will not hold 1/4 in (6.35 mm) tube even though the numbers look close, and the Dia 8 side needs true 8 mm OD soft nylon or polyurethane. Use soft-wall tubing only - rigid nylon or polyethylene will not seal on the chuck. On the Dia 8 side, check your flow need: a hard-working cylinder fed through a 4 mm drop will be noticeably slower than one fed in 8 mm throughout, so the reducer belongs on signal, pilot and light-actuation branches rather than on the main power line to a large bore.
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 PGJ Plug Pin Reducing Straight Connector PGJ8-4 FAQ
Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), with a negative-pressure capability of -750 mmHg (10 Torr) and a proof pressure of 1.5 MPa. The temperature range is -20 to +70 C. This SKU is a plug-in reducer joining Dia 8 mm tubing to Dia 4 mm tubing, both push-in, with no threaded port. Tubing must be soft nylon or polyurethane.
No sealant or PTFE tape is needed anywhere on this fitting - it has no threads, so the only seals are the NBR O-rings inside each chuck, and the joints are dry and reusable by pressing the release ring. But do not mix sizes: each end accepts only its own exact OD, so the Dia 4 socket will not grip 6 mm tube and the Dia 8 socket will not grip 6.35 mm (1/4 in) tube. For a 6 mm branch, step to Dia 6 first or use the PG different-diameter straight range.
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