The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-10 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ series, engineered for heavy-duty applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 10 mm adjustable range, allowing operators to shorten the 450 mm nominal stroke without dismounting the cylinder. This model features a built-in magnet, enabling direct mounting of CMSG, DMSG, or EMSG sensors for reliable end-of-stroke detection.
With a 250 mm bore and a 50 mm piston rod, this cylinder delivers a substantial push force of 24544 N at 0.5 MPa and a pull force of 23562 N, making it suitable for pressing, clamping, and material handling tasks requiring high force. The body length A(SCJ) is 409 mm, and the cylinder includes an adjustable air cushion with a 40 mm length to decelerate the piston smoothly. Operating on filtered air from 0.15 to 1.0 MPa, it uses a PT1 inch port and an M42x2 rod thread, conforming to an ISO 6430 class tie-rod design.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 10 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. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
The 10 mm stroke-end adjustment allows engineers to precisely dial in the final pressing depth during machine commissioning on a 250-bore press, eliminating the need for shims or external hard stops.
In a large-scale welding fixture, the adjustable stroke compensates for minor variations in workpiece thickness, ensuring consistent clamping force without over-stroking and damaging the part.
For a lumber sorting line, the SCJ250X450-10 acts as a high-force stop gate. The rear screw can be quickly adjusted to change the gate's extended position for different timber widths.
Choose the SCJ250X450-10 when you need a high-force actuator with a field-adjustable stroke end for tasks like commissioning a large press or accommodating tooling wear. If your force requirement is lower, stepping down to the 200 mm bore SCJ200 series reduces the push force to 15708 N at 0.5 MPa, which may be sufficient and more cost-effective. For applications needing a fixed, non-adjustable stroke, the standard SC250 series is a simpler alternative.
This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with a 450 mm nominal stroke, a 10 mm adjust range, PT1 inch ports, and a built-in magnet. For this 450 mm stroke, be mindful of potential side-loading on the 50 mm rod. If the application involves significant lateral forces, an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and seal wear.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force on the return stroke is 23562 N due to the 50 mm piston rod reducing the effective area. At the maximum operating pressure of 1.0 MPa, the push force reaches 49088 N.
Yes, if you need the 10 mm stroke-end adjustability. The SCJ250X450-10 is a direct replacement for an AirTAC SCJ250 of the same bore, 450 mm nominal stroke, and 10 mm adjust range with a magnet. It is not a drop-in replacement for a fixed-stroke SC250, as the SCJ body is slightly longer to house the adjusting mechanism.
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