The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X20-20S 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, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X20-20S is a double-acting, single-rod cylinder that lets you fine-tune the stroke end by up to 20 mm via a rear-cap adjusting screw. With a 63 mm bore and a 20 mm rod, it delivers 1559 N of push force at 0.5 MPa, making it a solid choice for short-throw positioning tasks where the final stop point must be dialled in during commissioning.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for clean end-of-stroke or mid-stroke sensing. The body length A(SCJ) is 197 mm, and the pneumatic cushion is 28 mm long to decelerate the piston quietly near stroke end.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X20-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 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, 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. |
| ×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 setup, the 20 mm adjusting screw lets technicians precisely set the retract end-stop for a pick-and-place jaw without swapping out hard stops or reprogramming servo positions.
On a conveyor diverter gate, the adjustable stroke compensates for wear on the rubber stop bumper over time, maintaining a consistent gate closed position with a simple screw turn.
In a light assembly fixture handling two product heights, the operator can quickly adjust the cylinder's stroke end to match the new part height, reducing changeover downtime.
Choose the SCJ63X20-20S when you need a 63 mm bore force class (1559 N push at 0.5 MPa) and the ability to trim the stroke end on the machine. If you require more force, step up to the 80 mm bore, which provides 2513 N push at the same pressure. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a simpler alternative. This SCJ replaces another AirTAC SCJ63 cylinder of the same 20 mm nominal stroke, 20 mm adjust range, PT port thread, and built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N.
A rear-cap screw sets the physical end-stop for the piston's stroke, shortening it by up to 20 mm from the nominal 20 mm. It is not a locking device; the piston will drift if air pressure is lost. For position holding without air, you must add an external rod lock or a pilot-operated check valve.
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