The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-20S is a large-bore ISO 6430 class double-acting single-rod cylinder with a field-adjustable stroke end, delivering 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 20 mm fine-tuning range, letting you dial in the exact end position without swapping the cylinder or adding external hard stops. The 50 mm rod and PT1" ports suit heavy-duty linear applications, while the 40 mm air cushion decelerates the piston smoothly at stroke end.
This model includes a built-in magnet (-S), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the barrel for reliable end-of-stroke detection. The body length A(SCJ) is 409 mm, slightly longer than the fixed-stroke SC equivalent to accommodate the adjusting mechanism. Operating pressure spans 0.15-1.0 MPa, with a proof pressure of 1.5 MPa and a speed range of 30-500 mm/s for controlled, powerful actuation.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 20 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Dial in the final pressing depth on a 250-bore stamping or forming press. The 20 mm screw adjustment compensates for tooling wear or material thickness variations without disassembling the tool set.
Fine-tune the open/close stroke of a large industrial gate or butterfly valve during commissioning. The adjustable stroke end ensures a perfect seal without over-stroking the valve body.
Set the precise retract position of a heavy-duty guide or deflector plate in a rolling mill. The rear screw allows operators to quickly adapt the stroke for different product widths.
Choose the SCJ250X250-20S when you need to fine-tune a 250 mm nominal stroke by up to 20 mm during commissioning or format changes. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, saving space and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC250X250 offers a simpler alternative without the rear screw mechanism. This cylinder is a direct replacement for another AirTAC SCJ250 with a 250 mm nominal stroke, 20 mm adjust range, PT ports, and a magnet-equipped barrel. At this 250 mm stroke, ensure the rod is supported against side loads; if lateral forces are present, add an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
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. The theoretical force at 1.0 MPa is 5006 kgf, though operation is limited to 1.0 MPa.
The SCJ250X250-20S has a rear-cap adjusting screw that shortens the stroke end by up to 20 mm. The 250 mm in the code is the nominal maximum stroke. This lets you fine-tune the piston's stop point on the machine without changing the cylinder, unlike a fixed-stroke SC where the stroke length is factory-set and cannot be altered in the field.
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