The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-30 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. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X225-30 is a double-acting, single-rod pneumatic cylinder that puts fine stroke control at your fingertips. Its rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm without removing the cylinder, making it ideal for commissioning trials or format changeovers where the exact stopping position needs to be dialed in on the machine. With a 50 mm bore, it delivers a push force of 982 N at a standard 0.5 MPa supply, rising to 1767 N at 0.9 MPa.
This model features a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread for easy attachment of tooling. The integrated air cushion, with a 21 mm cushion length, decelerates the piston smoothly at the end of its travel. The body length for this SCJ configuration is 194 mm, providing a compact footprint for applications where space is at a premium.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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.
Fine-tune the end-stop position of a pneumatic press or clamping fixture during initial machine setup. The 30 mm adjustment range allows engineers to quickly dial in the perfect stroke without fabricating custom mechanical stops.
Adjust the stroke of a diverter gate on a packaging line to handle different box sizes. Operators can change the stroke end in seconds by turning the rear screw, minimizing downtime between production runs.
Use the adjustable stroke to take up mechanical play or compensate for seal wear over time in a long-stroke actuator. The screw allows for precise, incremental adjustments to maintain consistent machine performance without replacing the cylinder.
This 50 mm bore cylinder is a versatile mid-range actuator. If your application requires more force, stepping up to a 63 mm bore SCJ will provide 1559 N of push force at 0.5 MPa. For a lighter, more compact solution, the 40 mm bore SCJ offers 628 N. If your stroke length is fixed and will never need field adjustment, the standard SC series is a more economical choice. For applications with high side loads, especially at this 225 mm stroke, consider an external guide rail or a guided cylinder to prevent rod bending and ensure long seal life.
This SCJ50X225-30 is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder of the same 50 mm bore, 225 mm nominal stroke, and 30 mm adjustment range, with PT ports, basic mounting, and no magnet. Ensure the replacement matches these exact specifications to guarantee proper fit and function.
Adjustable-stroke checklist
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. The pull force, which accounts for the 20 mm rod area, is 825 N at 0.5 MPa. This difference is normal for a single-rod cylinder.
A rear-cap screw mechanically limits how far the piston can extend, effectively shortening the stroke end by up to 30 mm. It is a stroke-end adjuster, not a mid-stroke positioner or a brake. The cylinder will not hold a load if air pressure is lost; an external lock or pilot-operated check valve is required for load-holding applications.
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