The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-50S 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-50S is a double-acting, single-rod pneumatic cylinder from AirTAC, offering a substantial 24544 N of push force at just 0.5 MPa. Its key feature is the rear-cap adjusting screw, which provides up to 50 mm of field-adjustable stroke reduction, allowing engineers to fine-tune the end position for commissioning, wear take-up, or format changes without replacing the cylinder. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable, non-contact position feedback.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter rod and a PT 1 inch port, with an adjustable air cushion that decelerates the piston over a 40 mm stroke length. The body length (A dimension) is 409 mm for the SCJ configuration. With a maximum operating pressure of 1.0 MPa, it can deliver a theoretical push force of up to 44178 N, making it suitable for heavy-duty industrial clamping, pressing, and positioning tasks requiring precise stroke-end adjustment.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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 the setup of a large hydraulic-style pneumatic press, the 50 mm adjustable stroke allows technicians to precisely dial in the final pressing depth on a 250 mm bore cylinder, accommodating tooling tolerances and material spring-back without disassembly.
In a steel processing line, this cylinder positions a heavy end-stop for different coil widths. The adjustable stroke enables rapid changeover between product formats, and the magnet allows a sensor to confirm the stop is fully retracted before the next coil is advanced.
For actuating a large industrial gate valve, the SCJ250X500-50S provides the necessary force. The stroke can be fine-tuned via the rear screw to ensure the valve gate fully seats without over-stroking, protecting the valve body from mechanical stress over thousands of cycles.
Select the SCJ250 when your application demands high force and the flexibility to adjust the stroke end by up to 50 mm on the machine. For applications needing a fixed, non-adjustable stroke, the standard SC250 cylinder is a more economical choice. If your force requirements are lower, stepping down to a 200 mm bore SCJ200 will provide a 15708 N push force at 0.5 MPa, which may be sufficient and more energy-efficient. For this model, a direct replacement must match the 250 mm bore, 500 mm nominal stroke, 50 mm adjust range, PT port thread, and the -S magnet option.
Given the 500 mm stroke length, careful consideration of side-loading is critical. The piston rod is subject to bending moments under lateral forces. To prevent premature seal wear and rod damage, it is essential to use an external guide rail system or switch to a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
At an operating pressure of 0.7 MPa, this single-rod cylinder generates a push force of 34361 N and a pull force of 23562 N. The difference is due to the area of the 50 mm piston rod reducing the effective area on the return stroke.
No. The SCJ series is not designed for position holding. If air pressure is lost or the directional valve is centered, the piston will drift or drop. The adjustable screw only sets the stroke end position and does not act as a mechanical lock. For load holding, you must add an external rod brake or a pilot-operated check valve.
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.