The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-50STC 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 SCJ80X75-50STC delivers a nominal 75 mm stroke from an 80 mm bore, with a rear adjusting screw that lets you shorten the stroke end by up to 50 mm without removing the cylinder. This model generates 2513 N of push force and 2268 N of pull force at 0.5 MPa, moving a 25 mm diameter piston rod through a 28 mm air cushion for controlled deceleration.
This specific unit includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and ships with a centre trunnion (TC) pivot assembly including the TCM1 bracket (order code F-SC80TC). The trunnion allows the cylinder to swing as the load articulates, making it ideal for pivoting machine elements. The body length A(SCJ) is 239 mm, and the port size is PT3/8.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-50STC |
|---|---|
| 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.
During machine setup, the 50 mm adjustment screw lets technicians dial in the exact stroke end position for grippers or clamps without iterative disassembly, speeding up the commissioning process.
On packaging lines switching between box sizes, the adjustable stroke quickly resets the pusher stroke end, eliminating the need to swap cylinders or add mechanical stops for each format.
In pressing or clamping operations, the stroke end can be gradually extended over time to compensate for tooling or pad wear, maintaining consistent contact force without replacing the actuator.
Choose the SCJ80 when your application needs roughly 2500 N of push force at standard plant air. If you require more force, step up to the 100 mm bore (3927 N push at 0.5 MPa); if space is tight and 1500 N class force is enough, the 63 mm bore (1559 N push) is a lighter alternative. The 50 mm adjustment range is generous for format changeovers or wear compensation, but if you only need a fixed stroke, the standard SC80 series is a simpler, lower-cost pick.
For replacement, match an AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, a nominal stroke of 75 mm, and a -50 adjustment range. Ensure the port thread is PT, the mounting is the TC centre trunnion with TCM1 bracket, and the magnet option (-S) is present. At a 75 mm stroke, rod buckling is not a concern, but for strokes exceeding 300 mm in this bore, always evaluate side loads and consider adding an external guide rail.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the piston area on the pull side. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N.
Yes, if your existing cylinder is an AirTAC SCJ80 with a 75 mm nominal stroke, a -50 adjustable range, PT ports, a centre trunnion (TC) mount, and a magnet for sensors. Verify the mounting bracket matches the F-SC80TC assembly. This is not an ISO 15552 cylinder, so it will not directly interchange with ISO-dimensioned brands.
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