The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X400-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 400mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X400-100S is a large-bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a generous 100 mm of stroke-end reduction, allowing engineers to fine-tune the piston's stop position for commissioning, format changes, or wear compensation without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, a PT1 inch port, and an M42x2 rod thread for robust connection. The built-in magnet (S suffix) allows for direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for precise, non-contact position feedback, making it ideal for heavy-duty industrial automation tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X400-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 100 mm adjustment range allows operators to quickly dial in the exact pressing depth for different material thicknesses on a large hydraulic-style pneumatic press, eliminating the need for mechanical shims.
In a steel processing line, the cylinder positions a heavy guide roller. The adjustable stroke compensates for roller wear over time, maintaining precise strip alignment without replacing the actuator.
Used on a fixture for welding large structural frames, the screw adjustment fine-tunes the clamp's closed position for different frame widths, ensuring consistent clamping force across product variants.
Select the SCJ250 for applications demanding very high force, where its 24544 N push at 0.5 MPa is essential. If your force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N, offering a more compact and economical solution. For fixed-stroke applications without the need for end-position adjustment, the standard SC series is a simpler alternative.
For this 400 mm stroke, carefully evaluate side-loading on the 50 mm rod. If lateral forces are present, an external guide rail or a guided cylinder is mandatory to prevent rod bending and premature seal failure. This model is a direct replacement for another AirTAC SCJ250X400-100S cylinder with a PT port and built-in magnet.
Adjustable-stroke checklist
At the standard operating pressure of 0.7 MPa, the theoretical push force for this 250 mm bore cylinder is 34361 N. The pull force on the return stroke is lower at 23562 N due to the area of the 50 mm rod.
The rear adjusting screw limits the piston's travel at the end of the stroke, effectively shortening it by up to 100 mm. It is a mechanical end-stop, not a locking device. If the load must be held in position without air pressure, an external rod lock or pilot-operated check valve is required.
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