Airtac PSL Throttle Speed Control Fitting PSL4-M5B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL4-M5B 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-M5B
The AirTAC PSL4-M5B is a threaded speed controller that sets actuator speed by throttling air in one direction while letting it pass freely the other way. This is the B version: meter-in. Flow from the M5 thread port out to the Dia 4 tube runs free, and the return path is throttled, so it is the right choice for a SINGLE-acting, spring-return cylinder, where you control the air entering the chamber and let the spring do the retracting. AirTAC marks the handle B so the setting cannot be confused with a meter-out part on the same manifold. The company's own application guidance puts meter-out first for double-acting cylinders; forcing meter-in onto a double-acting actuator invites stick-slip under varying load.
Adjustment is by an aluminium-alloy locking knob over a brass throttling column: turn to set, then lock the cap so vibration cannot walk the setting off. The body screws straight into the M5 port and takes Dia 4 soft nylon or polyurethane tubing one-touch. Rated 0-1.0 MPa working, it suits compact control panels where an M5 port is already machined in and there is no room for a 1/8in fitting.
Airtac PSL Throttle Speed Control Fitting PSL4-M5B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL4-M5B |
|---|---|
| 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-M5B
| 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-M5B Is Used
Lab dosing head
A Dia 4 line feeding a small single-acting dosing cylinder on an analytical instrument - meter-in control gives a slow, repeatable dispense stroke with the spring returning it.
PCB test fixture clamp
M5 ports on a fixture base drive a spring-return clamp pad onto a populated board; the B throttling keeps contact pressure ramping in gently instead of pecking the solder joints.
Compact gripper block
A miniature spring-return gripper on a small assembly head, where the M5 thread screws directly into the gripper body port and the locking knob stops the cycle time drifting.
Is the Airtac PSL Throttle Speed Control Fitting PSL4-M5B the Right Part?
Meter-in (this B code) matches single-acting cylinders: soft close under spring return, no slam on extend. If your actuator is double-acting, step to the A suffix instead and throttle the exhaust for a back-pressure cushion. Body-wise, PSL has a FIXED tube direction; if the tubing must rotate relative to the port, the PSS universal version swivels 360 degrees instead.
Sizing: Dia 4 is the smallest tube AirTAC makes on the PSL ladder, so there is no size below it - the single neighbour is PSL6-M5B, which opens the bore to Dia 6 for circuits that need more free-flow capacity on the same M5 thread. If your port is 1/8in PT rather than M5, the same Dia 4 tube exists as PSL401B. Fit the controller at the cylinder port, not back at the valve: the throttled volume stays small and response stays crisp.
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-M5B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. It takes Dia 4 soft nylon or polyurethane tubing on a one-touch joint and screws into an M5 PT thread port. Control method is meter-in (B): the tube-to-port return flow is throttled, the port-to-tube supply runs free. Construction includes a brass body and throttling column with an aluminium locking knob and PBT holder.
The suffix is the control method, not a variant of size. B is meter-in: air leaving the cylinder is throttled, air entering runs free - the correct pairing for a single-acting, spring-return cylinder. A would be meter-out, AirTAC's stated first choice for double-acting cylinders, where throttling the exhaust builds a back-pressure cushion and keeps the stroke smooth. Pick the letter to match the actuator, and note the handle is marked so operators can tell them apart on the machine.
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