The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, offering a nominal maximum stroke of 450 mm. The rear-cap adjusting screw provides a 50 mm range to fine-tune the stroke end position, making it ideal for commissioning and format changes on heavy-duty machinery. With a 50 mm rod and 1-inch PT ports, this ISO 6430 class cylinder delivers a substantial push force of 24544 N at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa.
This cylinder's body length A(SCJ) is 409 mm, and it features an adjustable air cushion of 40 mm for smooth deceleration of large loads. The standard operating temperature range for the TPU seals is -20 to +70 °C. This model is a basic configuration without a magnet, mounting accessories, or special port threads, providing a robust foundation for custom integration.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm adjustment range allows engineers to precisely dial in the final pressing depth on a 5000 kgf class press during initial setup, without needing to machine custom stops.
On a large packaging line, the adjustable stroke lets operators quickly change the pusher stroke for different pallet sizes, reducing downtime between production runs.
In a heavy-duty welding fixture, the stroke can be incrementally extended over time to compensate for wear on clamp pads, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ250 for applications requiring very high force output, such as pressing, clamping, or lifting heavy components. If your force requirement is lower, consider stepping down to the SCJ200, which provides a 15708 N push force at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series offers a simpler and more cost-effective solution. A direct replacement must match the 250 mm bore, 450 mm nominal stroke, 50 mm adjustable range, and PT port threads.
Given the 450 mm stroke, managing side loads is critical to prevent rod bending and premature seal wear. For any application where the load is not guided and perfectly aligned with the rod axis, you must integrate an external guide rail or switch to a guided cylinder assembly to ensure long service life.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The force increases with pressure, reaching a maximum push force of 44178 N at 0.9 MPa. The push force is higher because the single rod reduces the piston area on the pull side.
A screw in the rear cap mechanically limits how far the piston can retract. By turning this screw, you can shorten the stroke end by up to 50 mm from the nominal 450 mm. This is a mechanical stroke-end adjustment and does not change the cylinder's force or speed.
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