The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-100S is a double-acting, single-rod pneumatic cylinder with a 250 mm bore and a 175 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 100 mm of stroke-end adjustment. This allows for precise, on-machine fine-tuning of the piston stop position without replacing the cylinder or adding external hard stops. It delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty industrial applications.
A built-in magnet is integrated into the piston, enabling direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for reliable, non-contact position sensing. The cylinder body has a length A of 409 mm and uses a 50 mm diameter piston rod with an M42x2 thread. It operates on 40 µm filtered air within a standard temperature range of -20 to +70 °C and is equipped with an adjustable air cushion for smooth deceleration.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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.
Fine-tune the final clamp position on a large hydraulic-style pneumatic press. The 100 mm adjustment range allows operators to quickly compensate for different material thicknesses or tooling wear without disassembling the fixture.
Acts as a robust, adjustable end-stop for heavy pallets or steel beams on a conveyor line. The stroke can be precisely dialed in during commissioning to ensure perfect alignment with downstream equipment, even under high loads.
Precisely set the open/close limits of a large industrial gate or butterfly valve. The 100 mm adjustability simplifies setup and allows for fine-tuning the valve's flow characteristic, with the built-in magnet providing open/closed position feedback to the control system.
Select the SCJ250 bore for high-force applications where a field-adjustable stroke end is critical for process tuning. If the 24544 N push force at 0.5 MPa is excessive, stepping down to a 200 mm bore SCJ provides 15708 N of push force. Conversely, this model is the largest bore in the SCJ series. For applications requiring a fixed, non-adjustable stroke, the standard SC250 cylinder is a more economical choice. A direct replacement must match the 250 mm bore, 175 mm nominal stroke, 100 mm adjustment range, PT port thread, and the integrated magnet.
For this 175 mm stroke, side-loading is a critical design factor. The 50 mm rod is robust, but any significant lateral force can cause premature rod bearing wear and seal failure. To ensure long service life, an external linear guide or a guided cylinder should be used to fully absorb side loads, preventing them from reaching the cylinder rod.
Adjustable-stroke checklist
At the maximum operating pressure of 1.0 MPa, the theoretical push force is 44178 N. At the standard 0.5 MPa, the push force is 24544 N. The pull force is lower, at 23562 N at 0.5 MPa, due to the area of the 50 mm piston rod.
A screw mechanism in the rear cap of the cylinder acts as an internal, adjustable end-stop for the piston. By turning the screw, you can shorten the cylinder's stroke end by up to 100 mm from its nominal 175 mm maximum. It is a mechanical stroke limiter and does not adjust the cylinder's force or speed.
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