The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X225-75S is a double-acting, single-rod pneumatic cylinder with a 75 mm field-adjustable stroke range, set via a rear-cap adjusting screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a versatile actuator for applications requiring fine-tuned end-position control without swapping the cylinder.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors for precise, non-contact position feedback. The body length A is 185 mm, and it features a 21 mm air cushion for smooth deceleration. The adjustable stroke end is ideal for commissioning trials, format changeovers, and compensating for tooling wear.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 75 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. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -75 | 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 machine setup and trials without removing the cylinder, allowing engineers to quickly find the optimal stroke for a new process.
Adjust the stroke end to compensate for tooling wear or material thickness changes over time, maintaining consistent part quality in clamping or pressing operations.
Quickly adjust the cylinder stroke for different product sizes on a packaging or assembly line, reducing downtime during batch changes.
Choose the SCJ40X225-75S when you need to dial in a precise stroke end position within a 75 mm window on a 225 mm nominal stroke. For higher force, step up to the 50 mm bore SCJ50 series, which provides 982 N of push force at 0.5 MPa. If your application requires a lower force, the 32 mm bore SCJ32 series offers 402 N. This adjustable-stroke model is the correct choice over a fixed-stroke SC cylinder when the exact stroke length is not yet finalized or needs periodic adjustment. For a direct replacement, match the 40 mm bore, 225 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet.
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. The pull force is lower due to the 16 mm piston rod reducing the effective area on the return stroke.
A screw on the rear cap sets the stroke end position, allowing you to shorten the effective stroke by up to 75 mm from the 225 mm nominal maximum. It adjusts only the end position, not the cylinder's force or speed. The piston rod will not extend beyond the set point.
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