The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-30S 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, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X150-30 is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, delivering a substantial 24544 N of push force at 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction, allowing engineers to fine-tune the piston's stopping position without removing the cylinder from the machine. The 50 mm diameter rod and 1-inch PT port ensure robust flow for demanding applications.
This ISO 6430 class tie-rod cylinder uses a 40 µm filtered air supply within a 0.15–1.0 MPa operating pressure range. The built-in magnet (denoted by the -S suffix) allows for direct mounting of CMSG, DMSG, or EMSG sensors on the barrel for precise, non-contact position feedback. The body length (A dimension) for this SCJ model is 409 mm, and it features a 40 mm adjustable air cushion for smooth deceleration of heavy loads.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 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. |
| ×150 | 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 large forming or stamping presses, compensating for tooling wear or material thickness variations without disassembling the actuator.
In high-level palletizers, the adjustable stroke fine-tunes the vertical stop position for each product layer. The 24544 N push force at 0.5 MPa easily manages heavy pallet loads, while the magnet enables layer-confirmation sensing.
For modulating large industrial valves, the SCJ250X150-30 provides the necessary force and a field-adjustable stroke to perfectly match the valve's open/closed travel limits during initial system commissioning and calibration.
Choose the SCJ250 when your application requires the highest force in the SCJ range, with a 24544 N push at 0.5 MPa. If your force needs are slightly lower, the SCJ200 bore provides 15708 N of push force at the same pressure, offering a more compact and cost-effective alternative. The 30 mm stroke adjustment range on this model is ideal for commissioning and fine-tuning end positions on large-scale equipment.
For a direct replacement, match the 250 mm bore, 150 mm nominal stroke, 30 mm adjustment range, PT port thread, and the integrated magnet. This cylinder is a direct substitute only for another AirTAC SCJ250X150-30S. For strokes of 150 mm, rod bending from side loads is a critical consideration. If the load is not guided, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent premature seal and bearing wear.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force on the single rod is 23562 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 44178 N. The force is not equal in both directions because the rod occupies area on the piston's pull side.
A rear-cap screw mechanically limits the piston's stroke end by up to 30 mm, allowing you to shorten the 150 mm nominal stroke. This is a physical end-stop adjustment, not a position-locking mechanism. 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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