The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-30 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 SCJ250X175-30 is a heavy-duty double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, built on a robust tie-rod design. With a 250 mm bore and a 50 mm piston rod, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for pressing, clamping, and lifting large assemblies where fine-tuning the end position is critical during commissioning or format changes.
The rear-cap adjusting screw provides a 30 mm range to shorten the stroke end without removing the cylinder from the machine. This ISO 6430 class cylinder uses a PT1 inch port, features a 40 mm air cushion for smooth deceleration, and has a body length of 409 mm (A dimension), offering a reliable solution for demanding industrial environments.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-30 |
|---|---|
| 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.
Fine-tune the final insertion depth of a bearing or bushing press by adjusting the stroke end screw. The 30 mm range allows operators to compensate for part tolerance stack-ups without reprogramming the press control system.
Use as an adjustable end-stop on a conveyor line for large steel plates or timber sections. The stroke can be quickly shortened to accommodate different product widths during batch changeovers, providing a rigid stop with 24544 N of holding force.
In a large welding fixture, the 30 mm adjustment can take up wear on clamp pads or accommodate varying workpiece thicknesses, ensuring consistent clamping pressure without needing to shim or replace the cylinder.
Select this 250 mm bore when your application needs push forces around 24544 N at standard plant air pressure. For applications requiring slightly less force, stepping down to the 200 mm bore provides 15708 N of push force at 0.5 MPa. The SCJ is the correct choice when you need to precisely dial in the stroke end position on the machine; if a fixed, non-adjustable stroke is sufficient, the standard SC series is a more economical alternative. This model is a direct replacement for an existing AirTAC SCJ250X175-30 with PT ports and basic mounting. For strokes over 300 mm, always consider an external guide rail or a guided cylinder to protect the 50 mm rod from side-load bending.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force on the 50 mm rod is 23562 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 44178 N. Always design your circuit for the operating pressure that will be used.
Yes, if you need the ability to fine-tune the stroke end. The SCJ250X175-30 has the same mounting footprint and port size (PT1") as a fixed-stroke SC250X175. Ensure the 30 mm adjustment screw does not interfere with your machine structure and that you match the port thread and mounting type.
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