The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-75S 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-75S is a double-acting, single-rod pneumatic cylinder from AirTAC's tie-rod series, engineered for applications where the stroke end position must be fine-tuned on the machine. Its defining feature is the rear-cap adjusting screw, which provides up to 75 mm of field-adjustable stroke reduction, allowing operators to dial in the exact stopping point without swapping the cylinder or adding external hard stops. With a 250 mm bore and a 50 mm diameter piston rod, this unit generates a substantial 24544 N of push force at 0.5 MPa.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for reliable, non-contact position feedback. The cylinder body length A(SCJ) is 409 mm, and it features an adjustable air cushion with a 40 mm cushion length to decelerate heavy loads smoothly. Operating on filtered air from 0.15 to 1.0 MPa, this ISO 6430 class cylinder is built for heavy-duty industrial tasks requiring both high force and precise, variable end-position control.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-75S |
|---|---|
| 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.
In large hydraulic-style pneumatic press tools, the 75 mm adjust range allows operators to precisely set the final pressing depth for different material thicknesses or tooling setups, using the full 24544 N push force at 0.5 MPa.
Controls a heavy diverter gate on a mining or aggregate conveyor. The adjustable stroke allows fine-tuning of the gate opening to regulate material flow without needing to fabricate new mechanical stops for each product batch.
During the commissioning of a large automation cell, the 75 mm screw adjustment is critical for synchronizing the end position of a massive clamping fixture, compensating for accumulated tolerances in the welded frame.
Choose the SCJ250X175-75S when you need the immense force of a 250 mm bore combined with the ability to adjust the stroke end by up to 75 mm during commissioning or format changes. If your application requires even higher force, stepping up is not an option in this series, but if a smaller footprint is acceptable, the SCJ200 bore provides 15708 N of push force at 0.5 MPa. For applications not needing stroke adjustability, the fixed-stroke SC series is a simpler, more cost-effective alternative. This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with a 175 mm nominal stroke, 75 mm adjust range, PT ports, and a built-in magnet. For a 175 mm stroke, ensure the load is guided externally if significant side forces are present, as the long extension can create a large bending moment on the rod.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, the theoretical push force is 34361 N, and the pull force on the return stroke is 23562 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the retract side.
No. Like all standard pneumatic cylinders, the SCJ250X175-75S will not hold its position if air pressure is lost or the control valve is centered. The air cushion only decelerates the piston at the stroke end, and the adjusting screw only sets the mechanical end-stop. To hold a load safely without live pressure, you must add an external rod lock or a pilot-operated check valve.
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