The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-75 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the stopping position within a 75 mm range without swapping the unit. Its 250 mm bore delivers a substantial 24544 N of push force at 0.5 MPa, scaling up to 44178 N at the maximum operating pressure of 0.9 MPa, making it a workhorse for heavy industrial tasks.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a 1-inch PT port for high flow. The body length A(SCJ) is 409 mm, and the rear adjusting screw shortens the stroke end to precisely match your machine's travel requirement, which is ideal for commissioning large presses or taking up wear in material-handling systems.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 75 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. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -75 | 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 exact pressing depth on a large hydraulic-style pneumatic press during setup and product changeovers, using the 75 mm adjustment range to achieve consistent part forming without mechanical stops.
Fine-tune the end position of a heavy-duty pusher or stopper cylinder on a conveyor line to accommodate different pallet or product sizes, compensating for mechanical wear over time without downtime.
Adjust the clamping stroke on a large welding or assembly fixture to securely hold workpieces of varying thicknesses, using the rear screw to set the precise final jaw position for each batch.
Choose the SCJ250 when your application demands forces in the 24544 N (push at 0.5 MPa) class. If you need a more compact solution and can accept lower force, stepping down to a 200 mm bore reduces push force to 15708 N at 0.5 MPa. For applications that don't require end-of-stroke adjustment, a fixed-stroke SC cylinder is a simpler alternative.
At a 450 mm nominal stroke, ensure the rod is adequately supported against side loads; an external guide rail or a guided cylinder is recommended to prevent rod bending and premature seal wear. For a direct replacement, match the 250 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting style of this SCJ model.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force on the retract stroke is 23562 N due to the 50 mm rod reducing the piston area. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. Always factor in a safety margin for your load.
The rear-cap adjusting screw limits the piston's forward stroke end, allowing you to shorten the nominal 450 mm stroke by up to 75 mm. It is a mechanical stop for stroke adjustment, not a locking device. The cylinder will not hold its position if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
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