The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X25-30S is a double-acting, single-rod AirTAC cylinder that puts fine stroke tuning directly on the machine. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction from the 25 mm nominal maximum, letting you dial in the exact stopping position without swapping the cylinder or adding external hard stops. With a 16 mm diameter piston rod and PT1/4 ports, it delivers 628 N of push force at 0.5 MPa.
This model is built with an integrated magnet, so CMSG, DMSG, or EMSG solid-state sensors can be clamped directly onto the tie-rod barrel for non-contact position sensing. The body length A is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. It is a genuine AirTAC pneumatic component, ideal for applications where the stroke must be matched precisely to a workpiece or fixture during commissioning.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 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. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -30 | 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.
During machine commissioning, the 30 mm adjust range lets technicians precisely set the actuator end-stop to match the final tooling position without re-machining brackets.
The built-in magnet allows direct mounting of CMSG/DMSG sensors to confirm the adjusted stroke end, providing a closed-loop check for pick-and-place or clamping operations.
In applications where a gripper or contact pad wears over time, the rear adjusting screw can be periodically advanced to take up the slack and maintain consistent contact force and position.
Choose the SCJ40 when you need to fine-tune the stroke end on a compact 40 mm bore platform. If the 628 N push force at 0.5 MPa is slightly low, stepping up to the 50 mm bore (SCJ50) provides 982 N. For applications where the stroke is fixed and will never need adjustment, the standard SC40 fixed-stroke cylinder is a simpler, more cost-effective alternative. This SCJ40X25-30S is a direct replacement for another AirTAC SCJ40 with a 25 mm nominal stroke and 30 mm adjust range, equipped with a magnet, PT ports, and basic mounting.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The pull force is lower because the 16 mm piston rod reduces the effective piston area on the return stroke.
A screw in the rear end-cap mechanically limits how far the piston can retract. By turning the screw, you can shorten the stroke end by up to 30 mm from the 25 mm nominal maximum. This adjustment is done on the cylinder itself and does not require changing the air pressure or flow controls.
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