The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-50 is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that lets you fine-tune the stroke end by up to 50 mm. With a 250 mm nominal stroke and a 50 mm rod, this big-bore tie-rod actuator delivers 24544 N of push force at just 0.5 MPa, making it a workhorse for heavy industrial tasks where the end position needs field adjustment.
Its ISO 6430 class body has a length of 409 mm and uses a 1-inch PT port. The adjustable cushion decelerates the 50 mm rod smoothly, and the screw sets the exact stop point without changing the cylinder. This model comes with a basic mount, TPU seals for -20 to +70 °C, and standard PT threads.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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.
During commissioning of a large forming press, the 50 mm adjustment range allows operators to dial in the exact bottom-dead-centre position of the tooling without machining new stops.
A 250 mm stroke actuator on a hopper gate can have its opening adjusted in the field to control the flow rate of aggregates or grain, compensating for different material densities.
On a large structural welding fixture, the adjustable stroke end can be tweaked over time to take up wear on clamp pads, maintaining consistent clamping force without replacing the cylinder.
Step up to this 250 mm bore when a 200 mm cylinder's 15708 N push at 0.5 MPa is insufficient for your heavy tooling. If you need a fixed, non-adjustable stroke, the standard SC series is a simpler choice. For a drop-in replacement, match the SCJ250 bore, the 250 mm nominal stroke, the -50 adjust range, PT port thread, and basic mounting.
At this 250 mm stroke, the rod is already extended significantly. If your application involves off-axis loads, consider an external guide rail or a guided cylinder to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
At 0.5 MPa, it generates 24544 N pushing and 23562 N pulling. The maximum theoretical force at 1.0 MPa is 5006 kgf. Because it's a single-rod cylinder, the push force is always greater than the pull force.
No. The rear adjusting screw only sets the stroke end position; it is not a mechanical lock. If air pressure is lost or the valve is centered, the piston will drift. You must add an external rod brake or pilot-operated check valve to hold the load safely.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.