The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-100 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 100 mm of stroke-end reduction, allowing engineers to fine-tune the piston stop position for commissioning, format changes, or wear compensation without removing the cylinder from the machine.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod with an M42x2 thread and a PT 1 inch port. It features a 40 mm adjustable air cushion for smooth deceleration and a body length A of 409 mm. The maximum theoretical force reaches 5006 kgf at 1.0 MPa, making it suitable for heavy-duty industrial positioning tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 100 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -100 | 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 retract or extend end position on a large forming press during die setup and commissioning, using the 100 mm adjustment range to dial in the exact stroke without mechanical stops.
Adjust the stroke end of a log fence cylinder to accommodate different timber diameters, leveraging the 24544 N push force at 0.5 MPa to securely position heavy logs.
Remotely fine-tune the stroke of a guide roll cylinder on a hot strip mill, compensating for roll wear over time without shutting down the line, thanks to the rear adjusting screw.
Select the SCJ250X500-100 when you need a high-force, adjustable-stroke actuator for heavy tooling or clamping. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC250X500 is the direct alternative. A direct replacement must match the 250 mm bore, 500 mm nominal stroke, 100 mm adjustable range, PT 1 inch ports, and basic mounting. For strokes of 500 mm, ensure the rod is externally guided if significant side loads are present, or consider a guided cylinder to prevent rod bending and seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 24544 N of push force and 23562 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 44178 N.
A screw mechanism in the rear cap allows you to shorten the stroke end position by up to 100 mm from the nominal 500 mm stroke. This is a mechanical stop adjustment for commissioning and changeovers, not a speed or force control. It does not lock the piston in place when air pressure is removed; an external brake or pilot-operated check valve is required for load holding.
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