The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-75S 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, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-75S is a double-acting, single-rod pneumatic cylinder with a 250 mm bore and a nominal 450 mm stroke, featuring a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. This ISO 6430 class tie-rod cylinder delivers a substantial 24544 N of push force at 0.5 MPa, with a 50 mm diameter piston rod and PT 1 inch ports, making it a powerful solution for heavy-duty industrial tasks where the stroke end position must be precisely tuned during commissioning or changeovers.
A built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for reliable, non-contact position sensing. The cylinder operates on 40 µm filtered air from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, and includes an adjustable air cushion for smooth deceleration. Its standard TPU seals provide a working temperature range of -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 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. |
| ×450 | 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 final pressing depth in large hydraulic or pneumatic presses. The 75 mm screw adjustment allows operators to dial in the exact stop position for different die sets or material thicknesses without disassembling the tooling.
Adjust the stroke end on a heavy-duty conveyor diverter or lift gate. The 24544 N push force easily manages large pallets or bulk materials, while the adjustable stroke accommodates different lane widths or lift heights during format changes.
Use the SCJ250 as a positioning actuator for setting roll gaps in steel or paper processing. The rear screw provides a robust, mechanical end-stop that can be precisely set and locked, maintaining a consistent gap under high-force conditions.
Select the SCJ250 when your application demands high force and the ability to fine-tune the stroke end without replacing the cylinder. If a fixed stroke is acceptable, the standard SC250 offers the same force output in a slightly shorter body. For applications requiring even more force, stepping up to a larger bore is not possible within this series, so consider the mounting and structural requirements. To ensure a direct replacement, match the 250 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT port thread, and the -S magnet option.
With a 450 mm stroke, this cylinder extends significantly. Evaluate the application for potential side-loading or rod bending, especially with heavy or unguided payloads. If side forces are present, an external guide rail or a switch to a guided cylinder is necessary to protect the rod bearings and ensure long service life.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force on the retract stroke is 23562 N due to the area of the 50 mm rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 44178 N.
The rear-cap screw mechanically limits the piston's forward travel, allowing you to shorten the nominal 450 mm stroke by up to 75 mm. This is a direct replacement for any AirTAC SCJ cylinder with a 250 mm bore, 450 mm nominal stroke, a 75 mm adjustment range, PT ports, and a magnet. Ensure the mounting style and rod end match your existing setup.
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