Airtac PSL Throttle Speed Control Fitting PSL6M5B-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL6M5B-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 PSL6M5B-S
The PSL6M5B-S is a meter-in speed controller with a fixed tube direction: air from the M5 thread port runs to the Dia 6 tube unthrottled, and flow going back from the tube toward the valve is throttled. AirTAC treats meter-in as the right choice for SINGLE-ACTING cylinders, where a spring or load returns the rod and only the supply side needs slowing. On a double-acting cylinder, prefer a meter-out code (the A suffix) instead, because meter-in can cause stick-slip when the load changes mid-stroke.
The -S suffix changes the wetted internals: the throttling column is SUS304 in place of brass, and the throttling body is aluminium alloy or SUS304 depending on the part, with a stainless spring gasket. Adjustment is a knob with an aluminium locking cap, so the setting stays put under machine vibration. One thing the -S does NOT change is the ratings: this part works at 0-1.0 MPa, tolerates 1.5 MPa proof, and handles -20 to +70 C exactly like the brass version. The M5 thread is small, so a light-handed seal (PT tape, sparingly) is enough to avoid cracking the port.
Airtac PSL Throttle Speed Control Fitting PSL6M5B-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL6M5B-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 PSL6M5B-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 PSL6M5B-S Is Used
Lab sample lifter
A small single-acting stainless air cylinder lifting sample trays in a wash-down analytical bench. The SUS304 throttling column avoids brass contact, and the M5 port suits the compact manifold.
Marine hatch damper
A return-spring hatch on a boat feeder mechanism lowered smoothly by throttling meter-in flow to a Dia 6 cylinder. Stainless internals cope with salt-laden air.
Plating line jig clamp
A single-acting clamp closing a jig on a copper-plating line, slowed on the supply side with meter-in control so the jig does not knock the rack. Copper-free internals matter here.
Is the Airtac PSL Throttle Speed Control Fitting PSL6M5B-S the Right Part?
Sizing within the PSL stainless ladder: the step DOWN is the PSL4M5B-S on Dia 4 tube, which slows a smaller feed but passes less air on the free leg. The step UP does not exist on M5 - Dia 6 is the largest tube the M5 PSL ladder offers. If you need Dia 8, move to the 1/8in thread PSL801B-S. Whatever you pick, mount the controller directly at the cylinder port so the throttled volume stays small and the response stays crisp.
Choose the B (meter-in) code only when the actuator is single-acting or gravity/return-spring driven. AirTAC's own guidance puts meter-out first for general double-acting circuits. If you need the tube to swivel during setup, that is the PSS family, not this fixed-direction PSL.
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 PSL6M5B-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 Dia 6 tube x M5 thread meter-in (B) speed controller with a SUS304 stainless throttling column and a knob with locking cap. It uses soft nylon or polyurethane tubing. The -S suffix does not alter any of these figures versus the standard PSL.
B means meter-in: the supply path from the M5 port to the Dia 6 tube runs free, and exhaust flow back toward the valve is throttled. That suits single-acting cylinders. For a double-acting cylinder driven by a solenoid valve, AirTAC recommends the meter-out A code instead, because throttling the exhaust creates a back-pressure cushion that keeps the stroke smooth. Physically the two fit the same port, so the choice is a circuit decision, not a fitting one.
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