The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X200-40S 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, 200mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X200-40 is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 40 mm field-adjustable range, allowing engineers to fine-tune the stroke end position without removing the cylinder—ideal for large-scale equipment where precise mechanical stops are critical.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, 1 inch PT ports, and a generous 40 mm air cushion for smooth deceleration of heavy loads. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact end-of-stroke sensing.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X200-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 200 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. |
| ×200 | 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 in large hydraulic-pneumatic forming presses. The 40 mm adjustment screw allows operators to compensate for tooling wear or material thickness variations without disassembling the press tooling.
Adjust the push-off stroke on a high-level palletizer. The adjustable stroke lets technicians quickly recalibrate the pusher's end position for different pallet sizes or product formats during changeovers.
Set a precise, repeatable stop position for logs entering a large band saw. The SCJ250's robust 50 mm rod and 24544 N push force at 0.5 MPa provide the authority needed, while the screw allows fine adjustment for different cut lengths.
Choose the SCJ250X200-40 when you need a high-force actuator with on-machine stroke adjustability. If your application requires even more force, consider stepping up to a larger bore; for a lighter, more compact solution, the SCJ200 series offers 15708 N of push force at the same pressure. For fixed-stroke applications where adjustment is unnecessary, the standard SC250 cylinder is a direct alternative.
This model is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with a 200 mm nominal stroke, 40 mm adjust range, PT ports, and a magnet. For strokes of this length, ensure the load is guided externally or use a guided cylinder to prevent excessive side-loading and rod bending, which can lead to premature seal wear.
Adjustable-stroke checklist
At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5006 kgf (44178 N). At a typical factory air pressure of 0.7 MPa, it generates 34361 N of push force. The pull force is slightly lower due to the 50 mm rod area, providing 23562 N at 0.5 MPa.
No. The SCJ250X200-40 is not designed for load holding. If air pressure is lost or the directional valve is centered, the piston will drift or drop. The stroke-adjust screw only sets the mechanical end-of-stroke position and the air cushion only decelerates the piston. For mid-stroke holding, you must add an external rod lock or a pilot-operated check valve.
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