The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X100-30S is a heavy-duty double-acting single-rod cylinder with a field-adjustable stroke end, letting you fine-tune the stop position by up to 30 mm without removing the unit. Its 250 mm bore generates 24544 N of push force at 0.5 MPa, driven by a 50 mm diameter piston rod through a PT 1 inch port.
This ISO 6430 class tie-rod cylinder includes a built-in magnet as standard, so CMSG/DMSG/EMSG sensors clamp directly onto the barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly, and the rear screw sets the exact stroke end for commissioning or format changes.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 30 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. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -30 | 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.
Dial in the final 30 mm of a large forming press stroke during commissioning, achieving precise part depth without swapping out the 250 mm bore cylinder.
Fine-tune the retract position of a heavy guide gate on a rolling line to compensate for roller wear, using the rear screw to maintain exact alignment over time.
Set the clamp stroke end on a heavy welding jig for different product variants, using the 30 mm adjustment range for quick format changeovers without mechanical stops.
Choose this 250 mm bore when your application demands push forces around 24544 N at 0.5 MPa. If you can accept roughly 15708 N, stepping down to the 200 mm bore SCJ200X100-30 saves space and air consumption. For higher forces, this is the largest standard SCJ bore available.
This SCJ250X100-30S directly replaces another AirTAC SCJ250 adjustable-stroke cylinder with the same 100 mm nominal stroke, 30 mm adjust range, PT ports, and built-in magnet. If your stroke is fixed and never needs field adjustment, a standard SC250X100-S may be a simpler alternative. For strokes of 300 mm or more, evaluate side-loading on the 50 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 44178 N. The rear adjusting screw does not change these force values.
The rear-cap screw sets the stroke end position within a 30 mm range, effectively shortening the 100 mm nominal stroke. It is a mechanical stop for position tuning, not a locking device. The cylinder will not hold a load if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
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