The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-50S 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-50S is a large-bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke end. Its 50 mm rear-cap adjusting screw lets you fine-tune the stroke end position without removing the cylinder, making it ideal for commissioning large-scale equipment where the exact stop point must be dialled in under load. With a 50 mm rod and PT1" ports, this tie-rod cylinder delivers a substantial 24544 N of push force at 0.5 MPa.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the barrel for precise end-of-stroke or mid-stroke position feedback. The body length A(SCJ) for this 250 mm bore is 409 mm, and the adjustable air cushion decelerates the piston smoothly at each end. Operating pressure ranges from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 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. |
| ×175 | 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 on large forming or laminating presses without disassembling the tooling, compensating for material thickness variations.
Precisely set the stroke end for actuating massive gate or butterfly valves during commissioning, ensuring full open/close positions are achieved without over-stroking the valve body.
Adjust the end-stop of a log-positioning fence on the fly to account for wear on the carriage or to switch between different cutting programs, all while maintaining the 24544 N push force.
Choose the SCJ250 bore when your application demands a push force around 24544 N at 0.5 MPa. If your force requirement is lower, the SCJ200 bore provides 15708 N push at the same pressure, offering a more compact and cost-effective solution. This SCJ adjustable-stroke model is the right choice when you need to fine-tune the stroke end on the machine; for a fixed, non-adjustable stroke, the standard SC series is a direct alternative.
For a direct replacement, match this cylinder with another AirTAC SCJ of the same 250 mm bore, 175 mm nominal stroke, and 50 mm adjust range, with PT port threads and the -S magnet option. At this 175 mm stroke, the cylinder is well within its standard range, but for any stroke over 300 mm, carefully assess side-loading on the 50 mm rod and consider an external guide or a guided cylinder to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. 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 area on the return stroke.
A screw mechanism in the rear cap acts as an internal, adjustable end-stop. It allows you to shorten the stroke end by up to 50 mm from the nominal 175 mm stroke. This is a mechanical stroke-end limiter, not a speed or force controller, and it does not lock the piston in place when air pressure is removed.
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