The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-20S 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, 25mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X25-20S is a large-bore, double-acting single-rod cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 20 mm of fine-tuning, allowing machine builders to dial in the exact end-stop position for heavy-duty pressing, clamping, or positioning tasks without swapping the cylinder.
This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors, enabling precise end-of-stroke detection. The 250 mm bore cylinder uses a robust 50 mm diameter piston rod with an M42x2 thread and PT1 inch ports, and features a 40 mm air cushion for smooth deceleration of high-inertia loads. The body length is 409 mm.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Fine-tune the final pressing depth or clamping position on large hydraulic-style pneumatic presses during initial setup and commissioning, using the 20 mm adjustment range to achieve perfect part fit without mechanical shims.
Compensate for wear on tooling or dies in heavy manufacturing. The operator can easily adjust the stroke end to maintain consistent product quality over the tool's lifespan, avoiding early replacement.
Quickly adapt the end-stop position for different product formats on large processing equipment. The rear adjusting screw allows a single cylinder to handle multiple stroke lengths, reducing downtime during batch changes.
Select the SCJ250X25-20S when you need the immense force of a 250 mm bore—24544 N push at 0.5 MPa—with the ability to precisely trim the stroke end by up to 20 mm during setup. If your force requirements are lower, stepping down to a 200 mm bore SCJ reduces push force to 15708 N at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with a 250 mm bore, 25 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and a magnet.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder produces a push force of 24544 N and a pull force of 23562 N. This difference is due to the single-rod design, where the rod occupies area on the piston's pull side. The maximum push force at 0.9 MPa is 44178 N.
Yes, provided the bore (250 mm), mounting style, and port thread (PT) match. The SCJ250X25-20S gives you the added benefit of a 20 mm adjustable stroke end, which can simplify setup. However, the SCJ body is slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism, so verify your available space.
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