The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-75 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-75 is a heavy-duty double-acting single-rod pneumatic cylinder engineered for applications demanding substantial force and on-machine stroke fine-tuning. Its 250 mm bore generates a powerful 24544 N of push force at just 0.5 MPa, while the 50 mm diameter piston rod provides the rigidity needed for large-scale industrial tooling. The defining feature is the rear-cap adjusting screw, which allows the effective stroke end to be shortened by up to 75 mm, giving commissioning engineers a wide window for precise mechanical setup without altering the cylinder's mounting position.
This ISO 6430 class tie-rod cylinder is built for robust service with a 40 mm air cushion at each end to decelerate high-inertia loads. It uses a PT1 inch port and an M42x2 rod thread for secure connection of heavy end-effectors. The body length A(SCJ) is 409 mm, accommodating the internal adjustment mechanism. Operating on filtered air from 0.15 to 1.0 MPa, it delivers a maximum theoretical force of 5006 kgf, suitable for pressing, clamping, and positioning large assemblies.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 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. |
| ×175 | 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.
During die changeover on a large stamping press, the 75 mm adjustment range allows operators to dial in the exact final shut height without removing the cylinder, accommodating variations in tooling stack-up and ensuring consistent forming pressure.
In a lumber or steel plate transfer system, the adjustable stroke end acts as a programmable hard stop. The stroke can be fine-tuned to position heavy workpieces of varying widths accurately against a datum for the next machining operation.
When commissioning a large HVAC or process air damper, the SCJ250X175-75 provides the high torque needed via a linkage. The 75 mm stroke adjustment allows the technician to perfectly set the damper blade's fully open and closed positions on-site to match the ductwork.
Select the SCJ250X175-75 when your application requires the high force output of a 250 mm bore—24544 N push at 0.5 MPa—combined with a field-adjustable stroke end. If the force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N at 0.5 MPa, which may suffice for lighter tooling and reduce air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC series offers a simpler, more cost-effective solution. This model is a direct replacement for an existing AirTAC SCJ250X175-75 with PT ports and basic mounting; ensure the 75 mm adjustment range matches your machine's setup requirements. For strokes of 300 mm or more, carefully evaluate side-loading on the 50 mm rod and consider an external guide rail or a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The output force depends on the air pressure. At the standard 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (lower due to the 50 mm rod area). The maximum push force at the 0.9 MPa operating limit is 44178 N. The adjustable stroke screw does not change the cylinder's force output.
A rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm from its nominal 175 mm maximum. This is ideal for applications where the exact stroke length needs to be determined during machine setup, for format changeovers, or to compensate for tooling wear. Choose the fixed-stroke SC250 series if your stroke requirement is final and will not change, as it is a simpler, more economical cylinder.
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