The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-10 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X250-10 is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw provides up to 10 mm of stroke-end retraction, allowing machine builders and maintenance teams to dial in the exact stopping position for a 250 mm nominal stroke without changing the cylinder body. At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, with a 16 mm diameter piston rod and PT1/4 ports.
The tie-rod construction and adjustable air cushion at both ends ensure reliable deceleration across the 30-800 mm/s speed range. Its body length A(SCJ) is 185 mm, making it a compact solution for applications where the stroke must be fine-tuned during commissioning, format changeover, or to compensate for mechanical wear over time.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Fine-tune the stroke end position during initial machine setup without swapping cylinders or machining external hard stops. The 10 mm adjustment range allows precise positioning of tooling or actuators.
In high-cycle pick-and-place or clamping stations, the adjustable screw can be used to take up mechanical play or compensate for pad wear, maintaining consistent contact pressure and position over time.
Quickly adapt the cylinder stroke for different product sizes on a packaging or assembly line. The rear screw adjustment is far faster than replacing the cylinder or re-machining end stops.
Step up to a 50 mm bore SCJ when you need more than 628 N of push force at 0.5 MPa; the SCJ50 series provides 982 N. If your application requires a fixed, non-adjustable stroke, the standard SC40 series offers the same bore and mounting footprint without the rear adjusting mechanism. For guided loads or applications where the 250 mm stroke introduces a risk of side-loading and rod bending, consider pairing this cylinder with an external guide rail or switching to a guided cylinder series.
This SCJ40X250-10 is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 250 mm nominal stroke, and 10 mm adjustment range with PT ports and basic mounting. Ensure any replacement matches the port thread, magnet option, and mounting style exactly.
Adjustable-stroke checklist
A screw in the rear cap acts as an internal stroke limiter for the retract stroke end. Turning the screw shortens the effective stroke by up to 10 mm from the 250 mm nominal maximum. It sets the end position mechanically but does not lock the piston or hold the load when air pressure is removed.
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The pull force is always lower due to the area consumed by the 16 mm piston rod.
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