The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X400-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 400mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X400-10S is a double-acting, single-rod pneumatic cylinder that puts 24544 N of push force at 0.5 MPa into a compact, adjustable package. Its rear-cap screw provides a fine-tunable 10 mm stroke-end adjustment, letting commissioning engineers dial in the exact stopping position for large-format presses or heavy-gauge material handling without remounting the cylinder. The 50 mm diameter rod and PT1 porting ensure robust flow for consistent cycling.
This ISO 6430 class tie-rod cylinder includes a built-in magnet, so standard CMSG/DMSG/EMSG sensors clamp directly onto the barrel for reliable end-of-stroke or mid-stroke position feedback. The adjustable air cushion at each end decelerates heavy loads smoothly, protecting the end caps during high-cycle operation. The body length is 409 mm, providing a rigid platform for demanding industrial tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X400-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 10 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. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
The 10 mm adjustment range allows operators to fine-tune the final pressing depth on large hydraulic-pneumatic forming presses during product changeovers, ensuring consistent part quality without mechanical stop changes.
In high-level palletizers, the adjustable stroke compensates for pallet height variations and material compression, ensuring each layer is placed precisely at the correct height by the heavy-duty pusher arm.
Used on a log carriage fence, the SCJ250X400-10S lets the operator micro-adjust the log's lateral position against the saw blade to account for blade wear, directly improving lumber recovery and dimensional accuracy.
Step up to this 250 mm bore when the 200 mm bore’s 15708 N push force is insufficient for the load. If your application requires a fixed, non-adjustable stroke, the standard SC series is a more economical choice. For guided motion to counteract side loads on the 400 mm stroke, consider an external guide rail or a guided cylinder. This model replaces any SCJ250X400-10S with a PT port, basic mount, and magnet, matching bore, nominal stroke, and the 10 mm adjustment range.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides a push force of 24544 N and a pull force of 23562 N. The push force is higher because the single rod reduces the piston area on the return side. The maximum theoretical force at 1.0 MPa is 5006 kgf.
Yes, this is a direct dimensional and functional replacement for any AirTAC SCJ250X400-10S cylinder. You must match the 250 mm bore, 400 mm nominal stroke, 10 mm adjustment range, PT port thread, basic mounting style, and the built-in magnet. The tie-rod body length A is 409 mm.
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