The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-50 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-50 is a double-acting, single-rod pneumatic cylinder with a 50 mm field-adjustable stroke range, letting you fine-tune the stroke end position without swapping the unit. With a 250 mm bore and 500 mm nominal stroke, it delivers 24544 N of push force at 0.5 MPa, making it suitable for heavy pressing, clamping, and positioning tasks that require precise end-point calibration.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod, a PT1 inch port, and an M42x2 rod thread for robust mechanical connections. The rear adjusting screw provides up to 50 mm of stroke-end reduction, while the 40 mm air cushion decelerates the piston smoothly. The body length A(SCJ) is 409 mm, and the maximum standard stroke for this bore is 1500 mm.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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.
A hydraulic-style press frame using pneumatics can use the 50 mm adjustment screw to precisely set the final pressing depth for different part thicknesses, ensuring consistent force application without mechanical shims.
During the commissioning of large industrial valves, the adjustable stroke allows technicians to match the cylinder's end position exactly to the valve's seat, taking up any linkage tolerance on-site.
In a heavy-duty conveyor system handling large steel plates, the SCJ250 can act as a retractable stop. The stroke can be fine-tuned to accommodate different product widths, preventing over-travel.
Choose the SCJ250X500-50 when your application demands high force with the ability to dial in the final stroke position during commissioning or format changes. If 24544 N of push force at 0.5 MPa is insufficient, stepping up is not an option within this series, so consider intensifying the pressure or using a larger custom actuator. For a lower force requirement, the SCJ200 bore provides 15708 N of push force at the same pressure. If your motion profile does not require stroke adjustment, a fixed-stroke SC250X500 will be a simpler, more cost-effective alternative.
For this 500 mm stroke, be mindful of side loading which can cause rod bending. An external guide rail or a switch to a guided cylinder is recommended if the load is not perfectly axial. As a direct replacement, match the 250 mm bore, 500 mm nominal stroke, 50 mm adjustment range, PT1 inch port thread, and basic mounting style.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 24544 N of push force and 23562 N of pull force. The maximum push force at 0.9 MPa is 44178 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
You can, provided the additional rear length for the adjusting screw is accommodated in your machine. The SCJ250X500-50 matches the 250 mm bore, 500 mm nominal stroke, and PT1 inch port of the SC model, but adds a 50 mm stroke-end adjustment range. Ensure your mounting and envelope have clearance for the longer A(SCJ) body length of 409 mm.
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