The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-50S 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. Ø80mm bore, 75mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X75-50S is a double-acting, single-rod pneumatic cylinder with a 50 mm field-adjustable stroke range, letting you fine-tune the end position without swapping the unit. Its 80 mm bore delivers 2513 N of push force at 0.5 MPa, and the 25 mm diameter piston rod provides robust resistance to side loads.
A built-in magnet is integrated into the piston, allowing CMSG/DMSG/EMSG sensors to be clamped directly onto the tie-rod barrel for precise, non-contact end-of-stroke detection. The cylinder uses PT1/8 ports, an M20x1.5 rod thread, and features an adjustable air cushion to decelerate the piston smoothly over the final 28 mm of travel.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 28 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×75 | 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 allows engineers to dial in the exact stroke end position during initial machine setup, eliminating the need to machine custom stops or swap cylinders for minor travel changes.
With the built-in magnet, CMSG/DMSG sensors provide reliable mid-stroke or end-of-stroke signals to a PLC, making this cylinder perfect for automated pick-and-place systems requiring adjustable, verified positions.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be periodically advanced to compensate for wear on tooling or workpiece contact surfaces, maintaining consistent clamping force without mechanical rework.
Choose the SCJ80X75-50S when you need to commission a machine with a tunable 75 mm nominal stroke that can be reduced by up to 50 mm. If your force requirement is lower, stepping down to a 63 mm bore reduces push force to 1559 N at 0.5 MPa; for more power, the 100 mm bore provides 3927 N. This model is ideal when sensor feedback is needed, thanks to the built-in magnet.
For a direct replacement, match the 80 mm bore, 75 mm nominal stroke, 50 mm adjustment range, PT port thread, and the -S magnet option. If the application involves a fixed, unchanging stroke, a standard SC80X75 cylinder is a simpler alternative. For strokes of 300 mm or more, always assess the rod for potential buckling under compressive loads and consider an external guide assembly.
Adjustable-stroke checklist
At 0.5 MPa, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force (the difference is due to the 25 mm rod area). The maximum push force at the 1.0 MPa operating limit is 4523 N.
No, the SCJ80X75-50S is not designed for position holding. If air pressure is lost or the valve is centered, the piston will drift. The adjustable screw only sets the stroke end, and the air cushion only decelerates the piston. To hold a load without live pressure, you must add an external rod lock or a pilot-operated check valve.
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