Airtac PSL Throttle Speed Control Fitting PSL1203B-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1203B-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 PSL1203B-S
The PSL1203B-S is a stainless-equipped inline speed controller that screws into a 3/8in PT port and grips Dia 12 soft nylon or polyurethane tubing. Like every PSL, it throttles air in one direction and lets it pass freely in the other, so you set how fast an actuator moves without touching the valve that drives it.
The B suffix makes this the meter-in version: flow from the thread port into the tube runs free, and the return path through the body is the controlled side. That suits single-acting cylinders, where AirTAC's guidance says meter-in is the right choice and meter-out on a double-acting cylinder under changing load is what causes stick-slip. Adjustment is by a knob with an aluminium locking cap, so once the stroke speed is set it stays set. The -S build swaps the brass throttling column for SUS304 stainless, with a stainless spring gasket, which is why buyers put it on wash-down frames and plating lines where brass would corrode or contaminate.
Airtac PSL Throttle Speed Control Fitting PSL1203B-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1203B-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 PSL1203B-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 PSL1203B-S Is Used
Pallet strapping tensioner arm
A strapping machine's tension arm on a 3/8in-ported manifold needs a controlled pull so the strap seats without snapping back. The meter-in B control matches the single-acting tension cylinder, and Dia 12 tubing carries the volume a small-bore controller cannot.
Concrete block cubing pusher
A block-yard cubing line pushes heavy stacks in a dusty, damp environment. The SUS304 throttling column on this PSL1203B-S resists wash-down corrosion, and the large Dia 12 bore suits the big bore of the pusher cylinder.
Plating line rinse-station lifter
A hoist cylinder lifting jigs out of a rinse tank runs near copper-catalysed chemistry. The brass-free throttling column of the -S variant keeps copper ions out of the bath, while the 3/8in PT thread drops straight into the existing port.
Is the Airtac PSL Throttle Speed Control Fitting PSL1203B-S the Right Part?
Size both ways before ordering. One step down on the same 3/8in thread is the PSL1003B-S on Dia 10 tube - lighter hose and a smaller bore for compact actuators. One step up on Dia 12 tube is the PSL1204B-S, which moves to a 1/2in PT port; note that Dia 12 is not offered on the 1/4in thread at all, so stepping the thread down would force you down to Dia 10 too. Bigger bore means a curve capable of feeding bigger cylinders, not a published flow number - AirTAC publishes curves only.
Choose knob-style PSL over push-lock PTL when operators re-set speeds between product changeovers; the locking cap then holds the position. Mount the controller directly at the cylinder port so only the small trapped volume between valve and cylinder is throttled, and remember this part is not a shut-off: it is designed to weep slightly when fully closed. For isolating a Dia 12 circuit you need a proper valve such as the PHV.
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 PSL1203B-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is Dia 12 tube on a 3/8in PT thread, meter-in (B) control, with a SUS304 throttling column in place of the standard brass one. Ratings are identical to the non-stainless PSL1203B - stainless changes the material, never the figures.
Only soft nylon or polyurethane tubing in Dia 12 - rigid nylon or braided hose will not seal in the one-touch collet. The -S build keeps the same dimensions, knob and locking cap as the standard part; only the throttling column and spring gasket material change to SUS304, so no re-piping or panel rework is needed when you swap from the brass version.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Speed Controllers
Request a Quote for Airtac PSL Throttle Speed Control Fitting PSL1203B-S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.