The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-75S 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. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X100-75S is a robust double-acting, single-rod tie-rod cylinder with a field-adjustable stroke end, offering a massive 24544 N of push force at just 0.5 MPa. The rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, allowing machine builders to fine-tune the piston stop position during commissioning or changeovers without dismounting the cylinder.
This ISO 6430 class cylinder features a 50 mm diameter piston rod, a 1-inch PT port, and a 40 mm air cushion for smooth deceleration of high-inertia loads. The integrated magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact end-of-stroke detection.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×100 | 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 final pressing depth in a 50-ton pneumatic press by adjusting the stroke end screw, accommodating variations in material thickness or tooling wear without reprogramming.
Dial in the exact ejector stroke for large castings on a heavy-duty conveyor line, ensuring parts are pushed completely off the belt without over-traveling and damaging the stop.
Use the 75 mm adjustment range on a structural test rig to set precise, repeatable deflection limits for large beams, simplifying the setup between different test profiles.
Choose the SCJ250 when your application demands the highest force in the SCJ range, with 24544 N push at 0.5 MPa. If your force requirements are lower, stepping down to a 200 mm bore reduces push force to 15708 N at the same pressure. For applications requiring a fixed, non-adjustable stroke, the standard SC250 series is a more economical choice. This model is a direct replacement for any AirTAC SCJ250X100-75S cylinder with a PT port, basic mounting, and a magnet. For strokes of 300 mm or more, evaluate side-loading on the 50 mm rod and consider an external guide rail to prevent bending.
Adjustable-stroke checklist
The theoretical push force at the maximum operating pressure of 1.0 MPa is 5006 kgf (44178 N). At a standard factory pressure of 0.7 MPa, the push force is 34361 N. The pull force is lower due to the single 50 mm rod, providing 23562 N at 0.5 MPa.
Yes. The -S suffix in the model code SCJ250X100-75S indicates a built-in magnet on the piston. This allows you to directly clamp AirTAC CMSG, DMSG, or EMSG reed and solid-state sensors onto the cylinder's tie-rod barrel to detect piston position without external brackets.
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