Airtac PSL Throttle Speed Control Fitting PSL4M5A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL4M5A-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 PSL4M5A-S
The PSL4M5A-S meters air flowing from its M5 thread port out to the Dia 4 tube, while the return direction passes through unrestricted. This is the A suffix, meter-out, the control method AirTAC names as first priority: on a double-acting cylinder the throttled exhaust leaves a back-pressure cushion, so the stroke stays smooth instead of chattering under changing load. Adjustment is by a knob with an aluminium locking cap that holds the setting against machine vibration.
This is the -S stainless build: the throttling column is SUS304 instead of the brass used on the standard PSL, with a stainless spring gasket, which makes it the version to pick where copper contact is unwanted - plating lines, semiconductor bench tooling, similar processes. The M5 thread screws straight into a small valve or cylinder port and the Dia 4 push-in socket takes soft nylon or polyurethane tubing. Ratings are identical to the standard part: 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C.
Airtac PSL Throttle Speed Control Fitting PSL4M5A-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL4M5A-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 PSL4M5A-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 PSL4M5A-S Is Used
Analytical instrument probe actuator
On a compact sampling arm in a laboratory analyser, the SUS304 throttling column avoids copper contact with reagents while the Dia 4 bore matches the small lines that drive a light probe at a repeatable pace.
Micro pick-and-place head
A wafer-handling or small-component picker on an electronics assembly bench uses meter-out throttling so the head descends smoothly onto the part instead of dropping, and the M5 thread fits the tight manifold spacing of a compact valve island.
Gentle clamp on a small assembly jig
A fixture clamp closing on a polished or coated workpiece needs a damped final approach; the locking cap holds the knob setting so the gentle closing speed survives vibration from nearby machining.
Is the Airtac PSL Throttle Speed Control Fitting PSL4M5A-S the Right Part?
Dia 4 is the smallest tube the PSL offers on M5, so there is no smaller step in this ladder; the next size up is Dia 6 (PSL6M5A-S), which buys you a larger bore for shorter fill times on slightly bigger actuators. If your port is 1/8 in PT rather than M5, the PSL401A-S in stainless covers the same Dia 4 tube on the bigger thread. Fit the controller directly at the cylinder port so the throttled volume stays small and response stays crisp.
Choose this over a push-lock PTL-M when you want fast hand adjustment: the knob resets in seconds, whereas push-lock resists being knocked out of position but is slower to change. A fixed thread body like this suits a straight entry into the port; for tubing that has to swivel, move to the PSS family.
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 PSL4M5A-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under vacuum down to -750 mmHg (10 Torr), operating temperature -20 to +70 C. It fits Dia 4 soft nylon or polyurethane tubing on the tube side and has an M5 PT thread on the port side. Control is meter-out (A), and this -S version uses a SUS304 throttling column in place of brass with a stainless spring gasket. Stainless parts carry exactly the same ratings as the standard line.
No. The -S suffix swaps the throttling column and spring gasket to stainless for corrosion and copper-free duties; the adjustment mechanism, the meter-out A direction, the tube and thread ladder and every pressure or temperature figure are the same as the standard PSL4M5A. AirTAC publishes no separate ratings or finish specs for the stainless option, so you can drop it into the same position in the circuit without re-tuning anything.
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