The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X175-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 30 mm range to fine-tune the stroke end position, making it ideal for commissioning heavy-duty machinery or accommodating wear in large-scale clamping and pressing fixtures without replacing the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod and a 40 mm air cushion for effective end-of-stroke deceleration. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact position feedback. With a body length A of 409 mm, it uses a PT1 inch port and is rated for an operating pressure of 0.15 to 1.0 MPa.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 30 mm adjustment screw allows operators to dial in the exact pressing depth during initial setup of a 25-tonne shop press, eliminating the need for shims or custom tooling.
In a lumber processing line, the adjustable stroke can be periodically shortened to compensate for wear on clamp pads, maintaining consistent holding force without reprogramming the PLC.
Fine-tune the stroke end for a large-diameter butterfly valve actuator to ensure perfect disc seating, preventing leakage caused by an over-travel or under-travel condition.
Choose the SCJ250 for applications requiring the highest force in the SCJ series. If your load calculation is below 15000 N, stepping down to the SCJ200 bore (15708 N push at 0.5 MPa) can reduce air consumption and physical footprint. For fixed-stroke applications where no end-point adjustment is needed, the standard SC series is a more economical choice. Ensure the replacement matches this exact model: 250 mm bore, 175 mm nominal stroke, a 30 mm adjustable range, PT port thread, and a built-in magnet. For strokes of this length, always assess side-loading on the 50 mm rod; an external guide rail or a guided cylinder is recommended if the load is not perfectly axial.
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. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the area of the 50 mm rod.
Yes, provided the fixed-stroke SC has a 250 mm bore and a stroke at or below 175 mm. The SCJ will add a 30 mm field-adjustable range to the stroke end. You must match the PT port thread and ensure the basic mounting style is suitable, as the SCJ body length A (409 mm) is slightly longer than the equivalent SC.
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