The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-50S 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, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-50S is a heavy-duty double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap adjusting screw provides a 50 mm range to fine-tune the stroke end position, making it ideal for large-scale commissioning and format changes without swapping the cylinder. The 250 mm bore delivers a substantial 24544 N of push force at 0.5 MPa, driven by a 50 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback. It features a PT1 inch port, M42x2 rod thread, and a 40 mm adjustable air cushion to decelerate high-inertia loads. The ISO 6430 class body has a length A of 409 mm, and the standard operating pressure is 0.15 to 1.0 MPa.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 operators to fine-tune the final pressing depth in large forming or stamping machines, accommodating tooling wear or different material thicknesses without mechanical stops.
In high-level palletizing, the adjustable stroke lets you precisely set the layer height for different product or pallet types, ensuring consistent stacking with a single cylinder model.
Use the SCJ250 to power heavy-duty clamping fixtures where the final clamp position must be dialed in during setup. The built-in magnet provides confirmation that the 50 mm rod has reached its set point.
Select the SCJ250X250-50S when you need to precisely dial in the end position of a 250 mm nominal stroke under heavy load. If your force requirement is lower, stepping down to the 200 mm bore (15708 N push at 0.5 MPa) can reduce air consumption and physical size. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
For this 250 mm stroke, ensure the load is guided to prevent excessive side-loading and rod bending. The replacement match is an AirTAC SCJ adjustable-stroke cylinder with a 250 mm bore, 250 mm nominal stroke, a 50 mm adjust range, PT ports, and a built-in magnet. This model accepts basic mounting or optional FA, LB, or TC trunnion accessories from the SCJ subset.
Adjustable-stroke checklist
This single-rod cylinder provides a push force of 24544 N at 0.5 MPa and 44178 N at 0.9 MPa. The pull force is lower at 23562 N at 0.5 MPa due to the 50 mm rod reducing the piston area on the retract side. The maximum theoretical force is 5006 kgf at 1.0 MPa.
A rear adjusting screw lets you shorten the stroke end by up to 50 mm in the field. Choose this SCJ model when you need to fine-tune the piston's stop position during commissioning, for different product formats, or to compensate for wear. If your stroke length is fixed and will never need adjustment, the standard SC250X250 is a simpler, fixed-stroke alternative.
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