Airtac PSL Throttle Speed Control Fitting PSL4M5B-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL4M5B-S 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 PSL4M5B-S
The PSL4M5B-S is a stainless-steel speed controller that sets actuator speed by throttling air in one direction while letting it pass freely in the other. This B code is the meter-in type, marked B on the handle: flow from the M5 thread port to the Dia 4 tube runs free, and the reverse direction is throttled. AirTAC designates meter-in as the match for single-acting, spring-return cylinders, where the supply side needs the restriction; for a double-acting cylinder driven by a solenoid valve, AirTAC recommends the meter-out A type instead, because meter-in control tends to stick-slip under changing load.
The -S suffix is the stainless variant: the throttling column is SUS304 instead of brass, with the throttling body in aluminium alloy or SUS304 and a stainless spring gasket, so the part suits copper-free circuits in electronics assembly, plating and similar processes. Every published rating is identical to the standard PSL - 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C - because only the wetted metal changes, not the geometry. Adjustment is a knob with an aluminium locking cap that clamps the setting against vibration, on a PBT plastic body with an NBR seal, taking Dia 4 soft nylon or polyurethane tube on a PT-taper M5 thread.
Airtac PSL Throttle Speed Control Fitting PSL4M5B-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL4M5B-S |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 throttling column and body parts in place of brass, for copper-free environments. Ratings are unchanged from the standard version. 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 PSL4M5B-S
| 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. |
| -S | Stainless-steel body. |
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 PSL4M5B-S Is Used
Spring-return clamp on an electronics fixture
A single-acting clamp that closes a cover onto a PCB test nest can be eased in with the meter-in B action, keeping the small Dia 4 supply line to the M5 port short and the SUS304 column copper-free near sensitive assemblies.
Benchtop laboratory dispensing head
On a compact lab filler or sample ejector, the Dia 4 bore matches the narrow tubing of a small single-acting dosing cylinder, and the locking cap holds the set stroke speed through repeated cycles.
Plating-line lift assist
Where airborne chemicals attack brass, the SUS304 throttling column and stainless gasket let a light single-acting lift cylinder run at a controlled pace without copper in the wetted path.
Is the Airtac PSL Throttle Speed Control Fitting PSL4M5B-S the Right Part?
This is the smallest tube size in the PSL ladder. Dia 4 exists only on M5 and 1/8in threads, so stepping up in tube means PSL6M5B-S (Dia 6, M5) for a slightly larger free area, or PSL401B-S (Dia 4, 1/8in) if your port is 1/8in PT rather than M5. There is no Dia 4 or smaller alternative below this code. Pick the knob type over the push-lock PTL when you expect to re-tune settings during commissioning - it turns by hand - and prefer the push-lock version where the knob could be knocked out of adjustment. The PSL body has a fixed tube direction; if you need the outlet to swivel to suit the tubing run, the PSS universal series is the alternative. Fit the controller directly at the cylinder port so the small trapped volume between valve and actuator is what gets throttled.
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 PSL4M5B-S FAQ
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. This SKU is the B (meter-in) version, taking Dia 4 soft nylon or polyurethane tube on an M5 PT-taper thread, with a SUS304 throttling column and stainless spring gasket in place of the standard brass parts. Ratings are identical to the standard PSL4M5B.
No. A PSL speed controller is designed to leak slightly when fully closed, so it must never be used to isolate a circuit. For a manual shut-off with venting, AirTAC's PHV finger valve is the correct part - the PHV6A, for example, vents the outlet to atmosphere when closed. Note also that AirTAC publishes no turn count for the PSL needle, so settings should be dialled in by observing cylinder speed, then locked with the aluminium cap.
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