The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X50-20S 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. Ø63mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke adjustment directly on the machine. A rear-cap screw lets you shift the stroke end by up to 20 mm without removing the cylinder, which is invaluable during commissioning or format changeovers. The built-in magnet (suffix -S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the 63 mm bore tie-rod barrel for reliable end-of-stroke detection.
This model delivers 1559 N of push force at 0.5 MPa and can reach 2805 N at the maximum operating pressure of 0.9 MPa. The 20 mm diameter piston rod and PT1/4 port ensure a robust connection, while the 28 mm air cushion decelerates the load smoothly. The body length A(SCJ) is 197 mm, making it a compact solution for applications where the stroke end position must be dialled in precisely.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X50-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 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, 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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.
Perfect for applications where a workpiece stop position must be dialled in precisely after installation, such as a material pusher on a conveyor line. The 20 mm adjustment screw eliminates the need for shims or external hard stops.
Ideal for packaging machinery that handles multiple product sizes. Operators can quickly adjust the cylinder's stroke end to accommodate a new box or tray format without changing the cylinder or reprogramming complex servo axes.
In clamping or pressing fixtures, the adjustable stroke can compensate for wear on tooling or contact surfaces over time. A simple turn of the rear screw restores the correct clamping position, extending the service life of the fixture.
Step up to the SCJ80X50-20S if your application demands more force; the 80 mm bore provides 2513 N of push at 0.5 MPa. For applications where the stroke is fixed and will never need field adjustment, the standard SC63X50 fixed-stroke cylinder is a more economical choice. If your load has a significant side component, consider an external guide rail or a guided cylinder, as the SCJ's rod bearing is designed for axial loads.
This SCJ63X50-20S is a direct replacement for any AirTAC SCJ63 cylinder with a 50 mm nominal stroke, a 20 mm adjust range, PT ports, and a built-in magnet. Ensure the mounting style (basic) matches your current setup.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 1559 N of push force and 1402 N of pull force. The pull force is lower due to the area of the 20 mm piston rod. The maximum push force at 0.9 MPa is 2805 N.
Yes, provided the mounting and porting match. The SCJ63X50-20S has the same envelope as an SC63X50 but includes a rear adjusting screw. You can set the screw to its maximum extension to replicate the full 50 mm stroke, or use the 20 mm adjustment range to fine-tune the stroke end position.
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