The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X125-75 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, 125mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X125-75 is a heavy-duty double-acting single-rod cylinder delivering 24544 N of push force at 0.5 MPa, built for applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 75 mm adjustable range, allowing operators to dial in the exact stopping point without swapping the cylinder or adding external hard stops.
With a 50 mm piston rod, 1-inch PT ports, and a 40 mm air cushion, this ISO 6430 class tie-rod cylinder handles large inertial loads while the integrated variable cushion decelerates the piston smoothly. The body length A(SCJ) is 409 mm, and the maximum standard stroke for this bore is 1500 mm.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X125-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 125 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. |
| ×125 | 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 retract stroke end position during initial machine setup with the 75 mm adjustment screw, eliminating the need for custom-length cylinders or shims.
Adjust the stroke end to precisely eject large castings or weldments from a fixture, accommodating part tolerance variations without reprogramming the PLC.
Periodically adjust the stroke end to compensate for tooling wear or seal compression in high-cycle clamping systems, maintaining consistent clamp force over the machine's life.
Choose the SCJ250 bore when your application requires a push force around 24544 N at 0.5 MPa; stepping down to a 200 mm bore reduces push force to 15708 N, while the 250 mm bore offers the highest force in the SCJ family. The 75 mm adjustable stroke range is ideal for commissioning and format changeovers where the end position needs significant field adjustment. For fixed-stroke applications, consider the standard SC cylinder. A replacement must match the 250 mm bore, 125 mm nominal stroke, 75 mm adjust range, and PT port thread. For strokes of 125 mm, ensure the rod is adequately supported if significant side loads are present; an external guide or guided cylinder is recommended to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower due to the 50 mm piston rod area.
A rear-cap adjusting screw limits the piston's retract stroke end. You can shorten the effective stroke by up to 75 mm from the nominal 125 mm maximum. It sets the mechanical stop position and does not adjust force or speed.
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