The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X80-75 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. Its rear-cap adjusting screw provides up to 75 mm of adjustment range, letting you dial in the exact stopping position on the machine without swapping parts or adding external hard stops. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, making it a solid performer for mid-force clamping, pressing, and positioning tasks.
This adjustable-stroke design uses a tie-rod construction and is equipped with a PT1/4 port and a variable air cushion (21 mm long) to decelerate the piston smoothly. The body length A(SCJ) is 194 mm for the base cylinder, slightly longer than a fixed-stroke SC to accommodate the adjusting mechanism. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range allows engineers to fine-tune the stroke end position during initial machine setup, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error fitting.
Quickly adapt the stopping position for different product sizes on a packaging or sorting line. The rear screw adjustment makes format changes fast and repeatable without disassembling the actuator.
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or workpieces over time, maintaining consistent contact force without reprogramming a controller.
Choose the SCJ50X80-75 when your application demands a 50 mm bore but the exact stroke length needs to be tuned during commissioning or changeover. If you require more force, stepping up to a 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For a simpler, fixed-stroke solution without the rear adjuster, the standard SC series is a direct alternative. This cylinder is a direct replacement for another AirTAC SCJ50 cylinder with an 80 mm nominal stroke, a 75 mm adjustment range, PT ports, and basic mounting. For strokes of 300 mm or more, evaluate side-load and rod bending; an external guide or a guided cylinder is recommended to protect the rod bearing.
Adjustable-stroke checklist
The rear cap houses an adjusting screw that limits the piston's retraction stroke. By turning this screw, you can shorten the stroke end by up to 75 mm from the nominal 80 mm maximum. It adjusts the mechanical stopping position, not the air pressure or flow rate.
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. Because this is a single-rod cylinder, the push force (full bore area) is greater than the pull force (bore area minus rod area). The maximum theoretical push force at 1.0 MPa is 200 kgf.
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