The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X20-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X20-10 is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control into a compact 40 mm bore package. Its rear-cap adjusting screw provides up to 10 mm of stroke-end reduction, letting you dial in the exact stopping position without swapping the cylinder or adding external hard stops. With a 16 mm piston rod and PT1/4 ports, it delivers 628 N of push force at a standard 0.5 MPa supply.
This tie-rod cylinder uses a TPU seal for reliable operation from -20 to +70 °C and features an adjustable air cushion for smooth deceleration. The body length A is 185 mm, making it a direct fit for applications where space is tight but precise, repeatable end-position tuning is needed during commissioning or format changes.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X20-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 20 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | Nominal (maximum) stroke length in mm. |
| -10 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The 10 mm rear adjuster allows technicians to quickly fine-tune the actuator's end stop during initial machine bring-up, compensating for small assembly tolerances without needing to re-machine mounting brackets.
Perfect for applications where a sensor bracket or trip dog is mounted on the rod. The stroke can be tweaked by up to 10 mm to perfectly align with a reed switch or limit valve, ensuring consistent signal triggering.
Ideal for acting as an adjustable end-stop or diverter gate on a conveyor for small, lightweight products. The 628 N push force at 0.5 MPa provides ample power, and the stroke can be easily re-set for different product widths.
Choose the SCJ40X20-10 when your machine needs a short, 20 mm nominal stroke that can be finely shortened by up to 10 mm from the rear. If you require more force, stepping up to the SCJ50 series provides 982 N of push at 0.5 MPa. For applications where the stroke must remain absolutely fixed and never be adjusted, a standard SC40 fixed-stroke cylinder is a simpler, more cost-effective alternative. This model is a direct replacement for any AirTAC SCJ40X20-10 with PT ports and basic mounting.
Adjustable-stroke checklist
The theoretical push force is 628 N at 0.5 MPa and 1130 N at 0.9 MPa. The pull force is lower due to the 16 mm piston rod area, delivering 528 N at 0.5 MPa. These forces are identical to the fixed-stroke SC40 cylinder.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position by up to 10 mm. It sets a mechanical limit, so the cylinder will always stop at that precise point, but it does not lock or hold the position when air pressure is removed.
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