The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-30S 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, 25mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X25-30S is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke series, offering a 250 mm bore and a 25 mm nominal stroke. The defining feature is the rear-cap adjusting screw, which provides a 30 mm field-adjustable range to fine-tune the stroke end position without removing the cylinder. At 0.5 MPa operating pressure, this model delivers a substantial 24544 N of push force, with the pull force at 23562 N due to the 50 mm diameter piston rod.
This cylinder is built on a robust tie-rod construction and is classified as an ISO 6430 class unit for its large bore size. It features an adjustable pneumatic cushion (40 mm length) for smooth deceleration and a G1 port. The integrated magnet, designated by the 'S' suffix, allows for direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for precise, non-contact position feedback.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
The 30 mm adjustment screw allows operators to precisely dial in the final pressing depth on a heavy-gauge forming press during new product setup or after tooling changes, without disassembling the actuator.
In a large industrial clamping fixture, the adjustable stroke can be periodically extended to compensate for wear on clamp pads or the workpiece contact surface, maintaining consistent clamping force over time.
For a machine that processes different material thicknesses, the stroke end can be quickly re-adjusted via the rear screw to match the new format, significantly reducing changeover time compared to swapping fixed-stroke cylinders.
Select the SCJ250X25-30S when you need immense pushing power in a compact stroke length with the ability to make fine end-stop adjustments on the machine. If the 24544 N push force at 0.5 MPa is beyond your requirement, consider stepping down to the 200 mm bore SCJ200 series, which provides 15708 N of push force. This adjustable-stroke model is ideal for commissioning and setup; if your application has a fixed, unchanging stroke, a standard SC fixed-stroke cylinder would be a simpler and more cost-effective choice.
For a direct replacement, match this model with another AirTAC SCJ250X25-30S cylinder, ensuring the 30 mm adjust range, PT port thread, and built-in magnet are identical. While the stroke is short, the massive forces involved mean any external side-loading must be carefully managed with an external guide system or by switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The theoretical push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force on the retract stroke is lower due to the single 50 mm rod, producing 23562 N at 0.5 MPa. These forces assume a stable air supply and no external friction.
The 'S' suffix indicates a factory-installed magnet specifically designed to work with AirTAC's CMSG, DMSG, and EMSG series of reed and solid-state sensors. While other brands may physically fit, reliable switching performance is only guaranteed with the compatible AirTAC sensors mounted directly on the cylinder's tie-rod slots.
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