The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-40 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-40 is an ISO 6430 class double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications requiring precise, field-adjustable stroke end positioning. With a 250 mm bore and a 50 mm diameter piston rod, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for pressing, clamping, and material handling tasks where force demands are high. The rear-cap adjusting screw provides up to 40 mm of stroke-end reduction from the nominal 175 mm stroke, allowing fine-tuning without removing the cylinder from the machine.
This model features a 40 mm adjustable cushion for smooth deceleration and a PT1" port for standard air connections. The body length A(SCJ) is 409 mm, and the maximum theoretical force reaches 5006 kgf at 1.0 MPa. Operating on filtered air from 0.15 to 1.0 MPa, it performs reliably in temperatures ranging from -20 to +70 °C. The basic mounting configuration accepts the SCJ-specific accessory range, including FA, LB, and TC mounts, for straightforward integration into existing setups.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 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. |
| ×175 | 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 clamping position on a large hydraulic-style pneumatic press by adjusting the stroke end up to 40 mm, ensuring consistent part compression without over-stroking and damaging tooling.
Dial in the exact stop position for a heavy-duty conveyor diverter or pusher. The adjustable stroke compensates for different pallet or product widths on the fly during a format changeover.
Speed up the commissioning of a large welding or assembly fixture. The rear screw allows engineers to precisely set the actuator's end point to match the as-built fixture dimensions, eliminating the need for shims.
Select the SCJ250 bore when your application demands forces in the 24544 N push class at standard plant pressure. If your force requirement is closer to 15708 N, stepping down to the SCJ200 bore can reduce air consumption and physical footprint. This adjustable-stroke variant is the right choice over a fixed-stroke SC when you need to fine-tune the end position for commissioning, format changes, or to compensate for tooling wear without adding external hard stops. For a direct replacement, match a genuine AirTAC SCJ250 cylinder with a 175 mm nominal stroke, a 40 mm adjustment range, and a PT1" port thread.
For this 175 mm stroke, the heavy 50 mm rod provides excellent rigidity, but if the load has a significant off-axis component, consider an external guide rail or a guided cylinder to protect the rod bearings and piston seals from premature wear. The SCJ250 uses a tie-rod construction and is not dimensionally interchangeable with ISO 15552 profiles; it is an ISO 6430 class cylinder. If your application requires a fixed, non-adjustable stroke, the standard SC250 cylinder is the correct alternative.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The push force is higher because the single rod reduces the piston area on the return side. The maximum operating push force at 0.9 MPa is 44178 N.
Yes, if you need the ability to fine-tune the stroke end. The SCJ250X175-40 has the same 250 mm bore and PT1" port as a fixed SC250, but its body is slightly longer to house the rear adjusting screw. Ensure the 40 mm adjustment range covers your stroke-reduction needs and that the mounting footprint is compatible.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.