The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-100S 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-100S is a heavy-duty double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 100 mm of stroke-end reduction, letting you fine-tune the piston stop position for large-scale commissioning, format changes, or wear compensation without removing the 409 mm body from the machine.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod, G1 inch ports, and a 40 mm air cushion to decelerate the 300 mm nominal stroke. The built-in magnet (S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable end-of-stroke detection, while the standard TPU seals and PT threads suit general industrial environments from -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Fine-tune the bottom-dead-centre position of a large forming press during commissioning or after tooling changes, using the 100 mm adjustment range to dial in the exact stop point without disassembling the cylinder.
Adjust the final placement height of a palletizing ram as pallet types or product layers change, compensating for stack height variations with the rear screw rather than rewriting the PLC program.
Set the precise open position of a heavy damper gate in a bulk material chute, taking up linkage wear over time by shortening the stroke end in the field to maintain a tight seal.
Choose the SCJ250 bore when your application demands push forces in the 24544 N class at 0.5 MPa. If your force requirement is closer to 15708 N, stepping down to the SCJ200 bore saves space and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC250 cylinder is a lighter, simpler alternative. This SCJ250X300-100S is a direct replacement for an existing AirTAC SCJ adjustable cylinder of the same 250 mm bore, 300 mm nominal stroke, 100 mm adjust range, PT port thread, and magnet-equipped configuration. At a 300 mm stroke, always assess side-loading on the 50 mm rod; if the load is not perfectly guided, add an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (the pull force is lower because the 50 mm rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
No. Like any standard double-acting pneumatic cylinder, the SCJ250X300-100S will drift or drop if air pressure is lost or the directional valve is centred. The stroke-adjust screw only sets the stroke end position; it is not a locking device. To hold a load safely without live pressure, you must add a mechanical lock, an external rod brake, or a pilot-operated check valve.
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