The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-40 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, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X100-40 is a double-acting, single-rod pneumatic cylinder from the heavy-duty ISO 6430 class, delivering 24544 N of push force at just 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides a 40 mm field-adjustable stroke-end range, allowing engineers to fine-tune the piston stop position without removing the cylinder or adding external hard stops. The 50 mm diameter piston rod and PT 1 inch ports support high flow for demanding industrial cycles.
This 250 mm bore cylinder uses a tie-rod construction with a body length A(SCJ) of 409 mm and an adjustable air cushion to decelerate large inertial loads smoothly. The operating pressure spans 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa. At the maximum operating pressure of 0.9 MPa, the cylinder generates a push force of 44178 N, making it suitable for heavy pressing, clamping, and material handling tasks where the final stroke position needs periodic adjustment.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 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. |
| ×100 | 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 retract stop of a stamping press feeder to accommodate different material thicknesses or tooling wear, using the 40 mm adjustment range without disassembling the feed mechanism.
Adjust the end-of-line pallet stop position for varying pallet sizes on a heavy-duty conveyor. The 24544 N push force at 0.5 MPa ensures the stop can hold back fully loaded pallets.
Dial in the exact clamp stroke on a large injection molding machine during commissioning or mold changeover, leveraging the rear screw to set the precise clamp-up point.
Choose the SCJ250X100-40 when your application demands substantial force and the ability to dial in the stroke end position on the machine. If the 24544 N push force at 0.5 MPa is more than required, stepping down to a 200 mm bore reduces the force to 15708 N while keeping a similar 40 mm rod. For applications needing a fixed, non-adjustable stroke, the standard SC250X100 is a direct alternative. A direct replacement must match the 250 mm bore, 100 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting configuration.
For this 100 mm stroke, side-loading is generally less of a concern than with longer strokes, but the substantial mass of the 40 mm rod and attached tooling should still be guided externally if any off-axis force is present. If your process requires position feedback, specify the -S magnet option to enable CMSG/DMSG/EMSG sensors.
Adjustable-stroke checklist
At 0.5 MPa, it produces 24544 N pushing and 23562 N pulling. The maximum push force at the 0.9 MPa operating limit is 44178 N. Note that pull force is lower because the 50 mm rod reduces the effective piston area on the retract side.
Yes, it is a direct dimensional and performance match for another AirTAC SCJ250X100-40. Verify that your existing cylinder also has a 40 mm adjustable stroke range, PT 1 inch ports, and the same mounting type. If you need a magnet for sensors, ensure the -S suffix is included in the new model code.
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