Airtac PSL Throttle Speed Control Fitting PSL4-M5A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL4-M5A is a genuine speed controller, threaded elbow with knob with aluminium-alloy locking cap and fixed tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeSpeed controller, threaded elbow
- SeriesPSL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- AdjustmentKnob with aluminium-alloy locking cap
- 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 PSL Throttle Speed Control Fitting PSL4-M5A
The PSL4-M5A is AirTAC's smallest threaded speed controller: a Dia 4 tube outlet on an M5 PT male thread, with the A suffix meaning meter-out. Air moving from the thread port to the tube is throttled by a brass needle column, while the return direction passes through essentially unrestricted. Screwed directly into a small double-acting cylinder port, that throttled exhaust builds a back-pressure cushion so the rod glides instead of snatching - which is why AirTAC calls meter-out the first choice over meter-in for this arrangement.
Adjustment is a knurled knob with an aluminium-alloy locking cap: set the stroke speed, then screw the cap down so machine vibration or a stray sleeve cannot drift the setting. The body is brass with a PBT holder, an NBR seal and a POM sealing face. Unlike the swivelling PSS type, the tube direction on a PSL is fixed, so plan the plumbing before you install. Note that no silencer is built in - throttle noise at the valve, not here, is where one belongs.
Airtac PSL Throttle Speed Control Fitting PSL4-M5A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL4-M5A |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| Size class | Mini series (-M) |
| 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. A speed controller is not a shut-off valve - a small leak past a fully closed needle is normal. Close it before applying air, and turn it open slowly. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PSL Throttle Speed Control Fitting PSL4-M5A
| PSL | Speed controller, threaded elbow. |
|---|---|
| 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). |
| A / B | A = meter-out (controls flow from the thread port to the tube). B = meter-in. |
| D | Black. Blank = grey. |
| -M | Mini series. |
Meter-Out or Meter-In?
- check Meter-out (A) is the default. It throttles the air LEAVING the cylinder, so the piston runs against a back-pressure cushion and moves smoothly.
- check Use meter-out on double-acting cylinders - it is the one AirTAC lists as first priority.
- check Meter-in (B) throttles air ENTERING the cylinder. It suits single-acting cylinders and air motors.
- check Meter-in on a double-acting cylinder tends to give a jerky, stick-slip stroke under varying load.
- check Fit the controller at the cylinder port, not at the valve, so the throttled volume is as small as possible.
Where the Airtac PSL Throttle Speed Control Fitting PSL4-M5A Is Used
Mini pick-and-place gripper
Throttle the exhaust of a compact parallel gripper fed by Dia 4 tube so delicate PCB assemblies are held and released without a jolt, with the M5 thread matching the cylinder's small port.
Bench-top dosing pusher
Set a smooth, repeatable dispense stroke on a laboratory or electronics bench fixture, where the locking cap keeps the fine speed setting fixed between operator shifts.
Compact linear slide feed
Drive a miniature guide slide on an assembly jig at a controlled pace; meter-out exhaust throttling keeps the carriage steady even as the load changes along the travel.
Is the Airtac PSL Throttle Speed Control Fitting PSL4-M5A the Right Part?
On the M5 thread the PSL ladder has only two rungs: Dia 4 and Dia 6. This is the smaller one, so there is no smaller PSL below it - if your lines are already Dia 6, take the PSL6-M5A instead for more flow headroom on the same M5 thread. If you can move to a 1/8 PT thread, the PSL401A keeps Dia 4 tube but opens the full larger ladder. Choose the B version (meter-in) only for single-acting cylinders; on a double-acting cylinder under varying load, meter-in invites stick-slip.
If your actuators get set once and never touched, the push-lock PTL-M mini resists accidental re-adjustment better than a knob. Wherever you mount it, fit the controller at the cylinder port, not back at the valve: the volume being compressed between throttle and cylinder stays tiny, so the speed response is immediate.
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
- ✓ Meter-out (A) unless you know you need meter-in
Airtac PSL Throttle Speed Control Fitting PSL4-M5A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a media and ambient temperature range of -20 to +70 C. This SKU is the Dia 4 tube size with an M5 PT thread, and it accepts soft nylon or polyurethane tubing only.
No. It is a speed controller, not a shut-off valve: fully closed, the needle still seeps slightly by design, so it must never be relied on to isolate a circuit. For a manual air-off function on Dia 4 to Dia 12 lines, use the AirTAC PHV finger valve - the quarter-turn shut-off in this range. Also remember the A marking: this unit meters flow from thread to tube only, so plumb the M5 port into the cylinder and the Dia 4 tube back toward the valve.
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