The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-50 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end adjustment directly on the machine. Its rear-cap screw lets you shorten the stroke by up to 50 mm without removing the cylinder, which is invaluable during commissioning and for format changeovers. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, scaling to 1130 N at the 1.0 MPa maximum operating pressure.
This model carries a nominal 150 mm stroke, well within the 1200 mm maximum for the 40 mm bore. The body length A is 185 mm, and the adjustable air cushion provides 21 mm of deceleration at each end. Ports are PT1/4, the rod thread is M12x1.25, and the standard TPU seals suit operating temperatures from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 50 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. |
| ×150 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm adjustment screw lets technicians dial in the exact stroke end on a new machine without cutting brackets or adding external hard stops, speeding up factory acceptance tests.
On a packaging line switching between box sizes, operators can quickly reset the pusher stroke by up to 50 mm to handle different case depths without swapping the cylinder.
In clamping or pressing fixtures, the adjustable stroke end can be advanced over time to compensate for tooling or pad wear, maintaining consistent clamp force without re-machining stops.
Step up to the SCJ50 if you need more force—the 50 mm bore provides 982 N push at 0.5 MPa. If your application does not require field-adjustable stroke, the fixed-stroke SC40 series offers a simpler, more compact alternative. For a direct replacement, match the SCJ40 bore, 150 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting style.
At a 150 mm stroke, rod deflection under side load is minimal for the 16 mm rod, but if the load is not guided, consider adding an external guide rail or switching to a guided cylinder to protect the rod bearing and piston seals over time.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the single 16 mm rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1130 N.
Yes, if you need field-adjustable stroke. The SCJ40X150-50 shares the same bore, rod, and port dimensions as the SC40 series but adds a rear adjusting screw. Ensure your mounting allows for the slightly longer SCJ body length A of 185 mm and the 50 mm adjustment range.
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