The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X250-100 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 100 mm of stroke-end adjustment. Operating on filtered air at 0.15–1.0 MPa, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a versatile actuator for mid-range linear tasks where the final stroke length must be dialed in on the machine.
This 40 mm bore cylinder uses a 16 mm diameter rod, PT1/4 ports, and an M12x1.25 rod thread. The adjustable air cushion is 21 mm long, and the SCJ body length (A dimension) is 185 mm. Its maximum standard stroke is 1200 mm, so the requested 250 mm stroke is well within the standard range, ensuring fast availability.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 100 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
Field technicians can precisely set the retract stroke end to align with a new machine fixture, eliminating the need for shims or custom mechanical stops during initial system bring-up.
In a packaging line, the 100 mm adjust range allows operators to quickly reposition a stop gate for different box sizes, reducing changeover time between product runs.
In a clamping or pressing operation, the adjusting screw can be turned to take up slack from worn tooling or workpieces, maintaining consistent clamp force without reprogramming the machine.
Choose the SCJ40X250-100 when you need to fine-tune the stroke end position by up to 100 mm without swapping the cylinder. If your force requirement is lower, the 32 mm bore SCJ offers 402 N of push force at 0.5 MPa. For higher force, stepping up to the 50 mm bore provides 982 N. If your application does not require stroke adjustability, a fixed-stroke SC40X250 cylinder is a simpler, more cost-effective alternative. For a direct replacement, match the 40 mm bore, 250 mm nominal stroke, 100 mm adjust range, PT ports, and basic mounting. This stroke length is moderate; for applications with high side loads, consider adding an external guide rail or switching to a guided cylinder to protect the rod bearing.
Adjustable-stroke checklist
The rear cap has an adjusting screw that limits how far the piston can retract. By turning this screw, you can shorten the retracted stroke end by anywhere from 0 to 100 mm. The nominal 250 mm stroke is the maximum; the screw only adjusts the end position, not the cylinder's force or speed.
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The difference is due to the single-rod design, where the rod takes up area on the piston's pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1256 N.
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