The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-30S 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, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-30S is a large-bore double-acting single-rod cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 30 mm without swapping the unit. Its 50 mm diameter piston rod and 40 mm cushion length handle heavy guided loads, delivering 24544 N of push force at 0.5 MPa and up to 44178 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke detection. The body length A(SCJ) is 409 mm, and the PT1 inch port supplies ample flow for the 250 mm bore. Operating temperature range is -20 to +70 °C with the default TPU seal.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
During commissioning of a large hydraulic-style pneumatic press, the 30 mm screw adjustment lets technicians dial in the exact press-fit depth for bearing or bushing insertion without changing tooling.
In a steel plate conveyor system, the SCJ250X450-30S acts as an adjustable end-stop. Operators can fine-tune the stop position to accommodate different plate widths, leveraging the 24544 N force to halt heavy loads.
For a large injection mold clamping mechanism, the adjustable stroke compensates for mold-height variations or seal wear over time, maintaining consistent clamp force without replacing the entire cylinder.
Choose the SCJ250 when your application needs a field-adjustable stroke end in the 24544 N push force class at 0.5 MPa. If you require a slightly lower force, the 200 mm bore SCJ200 provides 15708 N push, while stepping up is not possible as 250 mm is the largest standard bore. For fixed-stroke applications where the end position never changes, the SC250 is a simpler alternative.
This cylinder replaces any AirTAC SCJ250 with a 450 mm nominal stroke, 30 mm adjust range, PT thread, and built-in magnet. For strokes of 450 mm, ensure the rod is externally guided or use a guided cylinder if the load applies significant side force, as the long extension can amplify bending moments on the 50 mm rod.
Adjustable-stroke checklist
At 0.5 MPa, it generates 24544 N pushing and 23562 N pulling. The maximum push force at 0.9 MPa is 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the return stroke.
Yes, if you need to fine-tune the stroke end by up to 30 mm. The SCJ250X450-30S shares the same mounting footprint and port size as the SC250. Ensure your replacement matches the 450 mm nominal stroke, PT1 inch port, and that you have the -S magnet if your existing setup uses sensors.
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