The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X20-20FA is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X20-20FA is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built around a 50 mm bore and a 20 mm rod. The rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting you fine-tune the piston stop position on the machine without swapping the cylinder. At 0.5 MPa it delivers 982 N of push force and 825 N on the pull stroke, making it a capable actuator for precise short-stroke positioning tasks.
This model comes with a front rectangular flange (FA) for rigid panel or end-face mounting, using the F-SC50FA accessory. The standard TPU seals offer reliable operation from -20 to +70 °C, and the PT1/4 ports keep the plumbing compact. With a 21 mm air cushion at each end, the SCJ50X20-20FA decelerates the load smoothly even in fast-cycling applications.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X20-20FA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 20 mm |
| Stroke adjustment | Up to 20 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. |
| ×20 | Nominal (maximum) stroke length in mm. |
| -20 | 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 commissioning, the 20 mm adjusting screw lets technicians dial in the exact stroke end position for grippers or stops, eliminating the need to fabricate shims or external hard stops.
In packaging or assembly fixtures, the 20 mm nominal stroke with fine adjustability is perfect for ejector pins or part-present sensors that require a precise, repeatable push distance.
On clamping or pressing stations, the adjustable stroke end can be periodically tweaked to compensate for pad wear or tooling drift, maintaining consistent clamping force without replacing parts.
Choose this 50 mm bore when your load needs around 982 N of push force at standard plant air pressure. If you can step down to a 40 mm bore (628 N push), the SCJ40 series offers a smaller, lighter package; step up to a 63 mm bore (1559 N push) for a substantial force increase. The front flange mount (FA) is ideal when the cylinder body must be bolted to a fixed bulkhead or machine panel, with the rod extending through.
This SCJ replaces any AirTAC SCJ50X20-20FA directly—match the 50 mm bore, 20 mm nominal stroke, 20 mm adjust range, PT threads, and FA front flange. For applications where the stroke never needs field adjustment, a simpler fixed-stroke SC50X20-FA cylinder can reduce cost and complexity.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 982 N of push force and 825 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1963 N. The pull force is always lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, this is a direct, form-fit replacement for any AirTAC SCJ50X20-20FA. It matches the 50 mm bore, 20 mm nominal stroke, 20 mm adjustable range, PT1/4 ports, and front flange (FA) mounting. Ensure your existing mounting bolt pattern matches the F-SC50FA flange dimensions.
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