The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X50-40 is a heavy-duty double-acting single-rod cylinder with a 40 mm rear adjusting screw, letting you dial in the exact stroke end on the machine without swapping the cylinder. With a 50 mm rod and PT1" ports, this tie-rod design delivers 24544 N of push force at just 0.5 MPa, making it a workhorse for large-scale pressing, clamping, and positioning tasks.
Its 40 mm adjustable range is ideal for commissioning fine-tuning, format changeovers, or compensating for tooling wear over time. The body length A(SCJ) is 409 mm, and the air cushion decelerates the piston smoothly across the 50 mm nominal stroke. Operating pressure spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa for a robust safety margin.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -40 | 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 pressing depth during machine setup with the 40 mm screw adjustment, eliminating the need for custom shims or hard stops.
Adjust the clamp stroke end for different workpiece thicknesses on a production line, ensuring consistent holding force without over-travel.
Take up mechanical play or tooling wear in high-cycle structural test rigs by advancing the stroke end position via the rear screw.
This 250 mm bore suits applications needing over 24 kN of push force at standard shop air. If your load is lighter, stepping down to the 200 mm bore (15708 N push at 0.5 MPa) reduces air consumption and physical size. For fixed-stroke applications where no field adjustment is needed, the standard SC series is a simpler alternative. If you require guided motion to handle off-centre loads, pair this cylinder with an external guide rail or consider a guided cylinder.
For direct replacement, match the 250 mm bore, 50 mm nominal stroke, 40 mm adjust range, and PT port thread. This model uses the basic mounting style; if you need a pivoting mount, the TC centre trunnion with TCM1 bracket is available as a factory option.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 44178 N.
A screw in the rear cap lets you shorten the stroke end by up to 40 mm. The nominal 50 mm stroke is the maximum; you can reduce it anywhere within that 40 mm range to precisely set the piston's stop point.
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