Airtac PSL Throttle Speed Control Fitting PSL603A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL603A 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 PSL603A
The PSL603A is an inline speed controller that screws into a 3/8in PT port and accepts Dia 6 soft nylon or polyurethane tubing in its fixed one-touch socket. With the A (meter-out) code, air flowing from the thread port to the tube is throttled by a tapered brass needle, while the return path passes freely. That throttled direction is what builds the back-pressure cushion AirTAC recommends for smooth double-acting cylinder strokes, so this is the default choice when a solenoid valve is driving the actuator.
Speed is set by a ribbed knob over an aluminium locking cap: turn the knob to set the stroke time, then push the cap down to lock the needle against vibration. Unlike the PSS universal type, the PSL body is fixed - the tube points one way and the 3/8in PT taper does the sealing with sealant tape, so no separate O-ring is needed. A grey PBT holder carries the cartridge and is marked A to confirm meter-out orientation on the machine.
Airtac PSL Throttle Speed Control Fitting PSL603A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL603A |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| 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 PSL603A
| 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. |
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 PSL603A Is Used
Conveyor indexing pusher
A 3/8in valve port feeding a short-stroke pusher that kicks cartons across a belt: meter-out throttling gives a repeatable push-and-retract cycle timed to the belt, and the locking cap stops the setting drifting as the frame shakes.
Pick-and-place gantry arm
On a small gantry lowering a suction-cupped PCB into a test nest, the meter-out cushion on the down-stroke prevents the arm slamming onto the nest when the load changes between a picked and an empty cycle.
Gentle clamp on machined parts
A pneumatic clamp closing on freshly milled aluminium faces needs a slow approach speed; dialling the PSL603A down at the clamp port lets the jaw close softly without marring, while the free reverse direction gives a fast, full-power open.
Is the Airtac PSL Throttle Speed Control Fitting PSL603A the Right Part?
On the 3/8in port ladder this sits between PSL803A (Dia 8 tube) and PSL1003A (Dia 10 tube); stepping up a bore raises free-flow capacity through a wider passage, while stepping down suits slimmer 8mm tubing on the same valve port. If your port is smaller, the same Dia 6 tube exists on PSL601A (1/8in) and PSL602A (1/4in); for a 1/2in port use PSL604A. Mount the controller directly at the cylinder port so the throttled air volume stays small and response stays crisp. If the tubing must swivel or the panel is tight, compare the PSS universal body instead; if you need tube-to-tube inline with no thread, the PSA range covers Dia 6.
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 PSL603A 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 6 tube on a 3/8in PT thread, meter-out (A). It suits soft nylon or polyurethane tubing, and PT taper threads seal with sealant tape rather than an O-ring.
Orient it so the controlled direction (thread port to tube) is the stroke you want to slow - for a double-acting cylinder that is normally the supply into the cylinder, leaving the exhaust free for the back-pressure cushion that keeps the stroke smooth. The handle marked A confirms meter-out. Screw the body into the cylinder port itself with sealant tape on the 3/8in PT taper, and remember the needle is not a shut-off: fully closed it still weeps slightly, so isolate the circuit elsewhere.
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