The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-75S 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, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-75S delivers a commanding 24544 N of push force at 0.5 MPa, making it a go-to actuator for heavy industrial tooling that demands both raw power and on-machine fine-tuning. Its rear-cap adjusting screw provides up to 75 mm of stroke-end adjustment, allowing operators to dial in the exact stop position for large-scale pressing, clamping, or forming operations without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and PT1 porting, with a generous 40 mm air cushion at each end to decelerate high-inertia loads. The built-in magnet (S) lets you mount CMSG/DMSG/EMSG sensors directly on the barrel for reliable end-of-stroke detection, while the 409 mm body length (A dimension) provides a robust, serviceable envelope for demanding 24/7 production lines.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Fine-tune the bottom-dead-centre position of a 25-tonne press by up to 75 mm during die changeovers, ensuring consistent part forming without swapping out the large-bore cylinder.
Adjust the retract stop of a log kicker or veneer clipper infeed stop to accommodate different material widths, using the rear screw for quick format changes on the saw line.
Set the final clamp position on a large fabrication jig to compensate for part tolerance stack-up, using the 75 mm adjustment to achieve repeatable clamping pressure without re-teaching the robot.
Step up to this 250 mm bore when the 200 mm bore’s 15708 N push at 0.5 MPa is insufficient for your heaviest tooling. If your application does not require field-adjustable stroke, the fixed-stroke SC250 offers a simpler, more compact alternative. For guided or side-loaded applications, an external guide rail or a dedicated guided cylinder is strongly recommended to protect the 50 mm rod from bending moments.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 250 mm bore, 250 mm nominal stroke, a -75 adjust range, PT port thread, basic mounting, and the -S magnet option. The built-in magnet ensures your existing CMSG/DMSG/EMSG sensor setup remains fully compatible.
Adjustable-stroke checklist
At 0.5 MPa, push force is 24544 N and pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, push force reaches 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
A screw in the rear cap lets you shorten the stroke end by up to 75 mm from the 250 mm nominal maximum. This sets a new mechanical stop for the piston, so you can fine-tune the extended position without changing the cylinder or adding external hard stops. It adjusts the stroke length, not the force or speed.
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