The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X250-50 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal stroke of 250 mm, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable range for the stroke end position. This allows precise fine-tuning on the machine without swapping the cylinder. It delivers a push force of 628 N at 0.5 MPa and 1130 N at 0.9 MPa, using a 16 mm diameter piston rod.
This tie-rod cylinder uses PT1/4 ports and an M12x1.25 rod thread, with a 21 mm adjustable air cushion for smooth deceleration. The SCJ body length A is 185 mm, making it a compact solution for applications where the end-stop needs to be dialed in during commissioning or format changes. It is a genuine AirTAC product built for reliable industrial service.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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.
Fine-tune the end-stop position during machine commissioning by up to 50 mm to perfectly align with mating parts, eliminating the need for shims or custom mechanical stops.
Quickly adjust the stroke for different product sizes on a packaging line. The 50 mm range handles multiple formats with a single cylinder model, reducing changeover time.
Take up mechanical wear in tooling or grippers over time. The rear screw allows operators to restore the precise stroke end position without disassembling the actuator.
Choose the SCJ40X250-50 when you need to adjust the stroke end position by up to 50 mm on the fly. For higher force requirements, step up to the 50 mm bore SCJ50, which provides 982 N of push force at 0.5 MPa. If your application does not require stroke adjustability, a fixed-stroke SC40X250 cylinder offers the same force and mounting footprint. For direct replacement, match the 40 mm bore, 250 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. For strokes of 250 mm or more, ensure the rod is guided externally if significant side loads are present to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the 16 mm rod area on the piston.
Yes, if you need field-adjustable stroke control. The SCJ40X250-50 has the same 40 mm bore, PT1/4 ports, and mounting accessories as the SC40 series, but it includes a rear adjusting screw that shortens the stroke end by up to 50 mm. The body length A is 185 mm, which is slightly longer than the fixed-stroke version. Ensure your mounting arrangement has clearance for the rear screw mechanism.
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