The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-50S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X80-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 50mm adjustment range on its 80mm nominal stroke. This model delivers 628 N of push force at 0.5 MPa and features a 16mm diameter piston rod with an M12x1.25 male thread, making it a robust choice for applications requiring fine-tuned positioning.
A built-in magnet (suffix -S) is integrated into the piston, allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The cylinder uses PT1/4 ports, a TPU seal for standard -20 to +70°C operation, and has a body length of 185 mm, with the rear adjusting screw enabling quick stroke changes without cylinder replacement.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 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. |
| ×80 | 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 50mm stroke adjustment range allows technicians to quickly fine-tune the actuator's end position during machine commissioning without swapping cylinders or machining custom stops, saving significant setup time.
Ideal for packaging or sorting lines where the push-off or stop position must be altered for different product sizes. The rear adjusting screw enables a fast, tool-free format changeover between batches.
In clamping or pressing fixtures, the adjustable stroke can be used to compensate for pad wear or material thickness variations over time, maintaining consistent clamping force without reprogramming a controller.
Select the SCJ40X80-50S when you need to precisely dial in the retract stroke end on a machine, with the 50mm adjustment range allowing for setup variations or tooling wear take-up. If your application requires more force, stepping up to the SCJ50 bore provides 982 N of push force at the same 0.5 MPa pressure, while a step down to the SCJ32 offers a more compact 402 N solution for lighter loads.
For a direct replacement, match an AirTAC SCJ cylinder with a 40mm bore, 80mm nominal stroke, and a 50mm adjustment range. Ensure the port thread is PT, the mounting is basic, and the magnet option (-S) is present for sensor compatibility. If your stroke is fixed and never needs field adjustment, the standard SC40X80 fixed-stroke cylinder is a more economical alternative.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 40mm bore cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa upper limit is 1130 N. The pull force is lower due to the area of the 16mm piston rod.
No. The rear adjusting screw only sets the mechanical end-of-stroke position; it does not lock the piston in place. Like any standard pneumatic cylinder, the SCJ will drift or drop if air pressure is lost or the valve is centered. To hold a load without live pressure, you must add an external rod lock or a pilot-operated check valve.
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