The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X100-40S is a heavy-duty, double-acting single-rod cylinder designed for applications where the end-of-stroke position requires fine-tuning after installation. Its rear-cap adjusting screw provides a 40 mm adjustable range, allowing the effective stroke to be shortened from the nominal 100 mm without replacing the cylinder or adding external hard stops.
With a 50 mm diameter piston rod and PT1 inch ports, this ISO 6430 class tie-rod cylinder delivers 24544 N of push force at 0.5 MPa. The integrated magnet allows for direct mounting of CMSG/DMSG/EMSG sensors for precise end-of-stroke position feedback, making it ideal for automated heavy machinery commissioning.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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 on a large hydraulic-style pneumatic press during commissioning or after tooling changes, using the 40 mm screw adjustment to achieve perfect part formation.
Acts as a pneumatic tensioner for a heavy-duty mining conveyor belt, where the adjustable stroke allows operators to take up belt stretch over time without replacing the cylinder.
Positions a heavy guide plate in a steel rolling mill, where the 24544 N push force is sufficient for movement, and the stroke-end adjustment compensates for wear on the guide surface.
Choose the SCJ250X100-40S when you need substantial force and the ability to dial in the stroke end position on a large-scale machine. If your application requires even higher force, stepping up is not possible within the standard AirTAC range, so consider a larger custom solution. For a lower force class, the SCJ200 bore provides 15708 N push at 0.5 MPa. If the stroke never needs adjustment, the fixed-stroke SC250X100 is a simpler, more cost-effective alternative. For exact replacement, match the 250 mm bore, 100 mm nominal stroke, 40 mm adjust range, PT port thread, and the built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The maximum operating force at 0.9 MPa is 44178 N push. The force is reduced on the return stroke due to the 50 mm rod's cross-sectional area.
Only if you no longer need the stroke adjustment feature. The SCJ250X100-40S has a longer body to house the adjusting screw. A direct replacement requires the same SCJ series, 250 mm bore, 100 mm nominal stroke, 40 mm adjust range, PT port thread, and built-in magnet.
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