Airtac PSL Throttle Speed Control Fitting PSL601BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL601BD-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 PSL601BD-S
PSL601BD-S is the SUS304 stainless version of the AirTAC PSL speed controller sized for Dia 6 mm soft nylon or polyurethane tubing on a 1/8 in PT male thread. The B control method makes it a meter-in part: air flowing from the thread port out through the tube is throttled by the needle, while return flow runs freely, so it sets actuator speed by restricting supply rather than exhaust. The tube outlet on a PSL is fixed in line with the thread - only the PSS universal body swivels.
AirTAC fits a SUS304 throttling column in place of brass, with a stainless spring gasket, and the D suffix gives the body a black finish. Adjustment is a knurled knob under a locking cap: set the speed by hand, screw the cap down, and the setting holds against vibration. Ratings are identical to the standard part - 0 to 1.0 MPa working pressure and -20 to +70 C - because the stainless option changes material, not performance.
Airtac PSL Throttle Speed Control Fitting PSL601BD-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL601BD-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 PSL601BD-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 PSL601BD-S Is Used
Single-acting clamp on a veneer press
A spring-return clamp closing onto finished veneer panels needs its power stroke slowed so the surface is not marred. Meter-in control on the supply side suits the single-acting circuit, and the Dia 6 bore matches the compact clamp lines typical of woodworking cells.
Lift cylinder on a plating line
In copper-free zones around plating tanks, the SUS304 throttling column replaces the brass part to avoid copper contamination in the bath chemistry. The meter-in B method paces a single-acting lift rod, and the black D body hides staining in a wash-down environment.
Tray ejector on a bakery line
A single-acting ejector that pushes baked trays off a conveyor is timed by throttling its supply stroke. Dia 6 tubing on a 1/8 in port is the standard size for small ejector cylinders, and the locking cap keeps the timing fixed through flour dust and wash-downs.
Is the Airtac PSL Throttle Speed Control Fitting PSL601BD-S the Right Part?
Meter-in is the right pick for a single-acting cylinder, where exhaust throttling has no back-pressure to cushion; for a double-acting cylinder driven by a solenoid valve, AirTAC treats meter-out as the first priority and you would order the A version of this same size instead. On the 1/8 in ladder, PSL401BD-S steps down to Dia 4 tubing and PSL801BD-S steps up to Dia 8 - the larger bore passes proportionally more air, so the same knob setting yields a faster stroke. Fit the controller directly in the cylinder port so the small throttled volume keeps the stroke response crisp.
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 PSL601BD-S FAQ
Working pressure 0 to 1.0 MPa (0 to 10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), and a working temperature range of -20 to +70 C. This SKU takes Dia 6 mm soft nylon or polyurethane tubing on a 1/8 in PT thread, with a SUS304 throttling column and a black body. The stainless variant carries exactly the same ratings as the standard PSL601BD.
No. A speed controller leaks slightly when the needle is fully closed by design, so it must never be relied on to isolate a circuit. For a manual shut-off at this size, AirTAC's PHV6 finger valve is the correct part - PHV6A vents the outlet to atmosphere when shut, while PHV6B holds both ports closed.
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 PSL601BD-S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.