The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-40 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-40 is a double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications where the end-of-stroke position must be precisely tuned on the machine. With a 250 mm bore and a 350 mm nominal stroke, it delivers a substantial 24544 N of push force at 0.5 MPa, and the rear-cap adjusting screw provides a 40 mm field-adjustable range to fine-tune the stroke end without removing the cylinder.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a 1-inch PT port for high flow. The adjustable air cushion, with a 40 mm cushion length, decelerates large inertial loads reliably. The body length A(SCJ) is 409 mm, making it a compact solution for its force class when space is a premium.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
Adjust the final pressing depth on a hydraulic-pneumatic intensifier press by up to 40 mm to compensate for varying part thicknesses or tool wear, ensuring consistent part quality without reprogramming the machine.
Set the exact open position of a large diverter gate on a mining or aggregate conveyor. The 40 mm adjust range allows operators to fine-tune material flow into different chutes after installation.
On a large structural welding fixture, use the rear adjusting screw to precisely set the clamp's closed position, accommodating different weldment batches and ensuring the 24544 N clamping force is applied at the correct point.
Select the SCJ250X350-40 when you need to dial in a precise stop position for a large forming press, clamp, or material-handling gate during commissioning or after tooling changes. If 24544 N of push force at 0.5 MPa is more than required, stepping down to the 200 mm bore SCJ200 series provides 15708 N of push force, reducing air consumption and physical footprint. For applications requiring a fixed, non-adjustable stroke, the standard SC250 series is a more economical choice.
For this 350 mm stroke, ensure the load is guided externally to prevent side-loading and rod bending, as the cylinder's rod bearings are designed for axial thrust, not lateral forces. A direct replacement must match the 250 mm bore, 350 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting configuration of this SCJ model.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder provides 24544 N of push force and 23562 N of pull force. The push force is higher because the single piston rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 5006 kgf.
A rear-cap adjusting screw allows you to shorten the stroke end position by up to 40 mm from the 350 mm nominal maximum. It does not change the cylinder's force or speed. You can replace a fixed-stroke SC cylinder with this SCJ model only if you need the field-adjustability feature and match the 250 mm bore, PT port thread, and mounting style exactly.
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