The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-40 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. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the stop position by up to 40 mm without swapping the unit. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a capable mid-size actuator for tasks that need on-machine tweaking during commissioning or changeover.
The rear adjusting screw shortens the nominal 50 mm stroke from the cap end, so the cylinder body length (A dimension of 185 mm) remains constant while the effective stroke is dialled in. It uses PT1/4 ports, M12x1.25 rod threads, and 21 mm of air cushioning at each end for smooth deceleration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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.
Dial in the exact end-stop position during machine commissioning without cutting brackets or adding external hard stops. The 40 mm adjustment range covers most trial-and-error positioning needs.
Quickly adapt a pusher or diverter stroke for different product sizes on a packaging line. The screw adjuster lets operators change the stroke end in seconds between production runs.
Take up mechanical play or seal wear over time by slightly extending the effective stroke. This keeps tooling in precise contact without replacing the entire cylinder.
Choose the SCJ40X50-40 when your application requires stroke-end adjustability in a 40 mm bore package. If you need more force, stepping up to the 50 mm bore SCJ50 series provides 982 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs field changes, the standard SC40 fixed-stroke cylinder is a simpler, cost-effective alternative. To replace this unit, match the 40 mm bore, 50 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting style exactly.
For strokes of 50 mm, rod bending is rarely a concern under axial loads, but always ensure the load is guided and aligned with the rod axis to prevent side-loading the bearing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Only if you need the adjustable stroke feature. The SCJ40X50-40 has a longer body to house the adjusting screw, so mounting dimensions differ from a fixed-stroke SC40. For a direct replacement, you must match the bore, nominal stroke, adjust range, port thread, and mounting style of your existing SCJ cylinder.
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