The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-100 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 SCJ250X175-100 is a heavy-duty double-acting single-rod cylinder built for applications where the stroke end position must be fine-tuned on the machine without swapping hardware. Its rear-cap adjusting screw provides up to 100 mm of stroke-end reduction, letting commissioning engineers dial in the exact stopping point for large-scale tooling, clamp strokes, or format changes. The 250 mm bore generates 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and PT1 inch ports. The adjustable air cushion, with a 40 mm cushion length, decelerates the high-inertia load smoothly, while the 409 mm body length A(SCJ) provides a robust foundation. The standard TPU seal operates reliably from -20 to +70 °C, and the PT thread ports ensure straightforward pneumatic connections.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-100 |
|---|---|
| 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.
During initial machine commissioning of heavy presses or clamping fixtures, the 100 mm adjust range allows technicians to fine-tune the stroke end position precisely, compensating for tooling tolerances without needing to machine custom stops.
In foundry or heavy fabrication lines, the adjustable stroke lets operators set the exact push distance for ejecting large castings or formed parts from a die, accommodating different part depths by simply turning the rear screw.
For high-cycle clamping of abrasive materials like concrete blocks, the stroke end can be incrementally extended over time to compensate for pad or tooling wear, maintaining consistent clamp force without immediate part replacement.
Choose the SCJ250X175-100 when you need the highest force class in the SCJ range and field-adjustable stroke end. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, saving energy and physical space. For fixed-stroke applications where the end position never changes, the standard SC250 cylinder is a simpler, more cost-effective alternative. This model is a direct replacement for an existing AirTAC SCJ250 cylinder with a 175 mm nominal stroke and 100 mm adjust range, matching PT ports and basic mounting.
At a 175 mm stroke, rod bending from side loads is less of a concern than on longer strokes, but the substantial 50 mm rod still demands that the load be guided externally if any lateral force is present. For applications requiring a pivoting motion, consider adding the TC centre trunnion mounting option to the ordering code.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower because the rod occupies area on the piston's return side.
Yes, if you need the ability to adjust the stroke end. The SCJ250X175-100 has the same mounting footprint as the SC series but adds a rear adjusting screw. Ensure your machine has clearance for the longer body length A(SCJ) of 409 mm and that the 100 mm adjust range covers your required stroke variation.
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