The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-20S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-20S delivers a field-adjustable stroke end within a 20 mm range, letting you fine-tune the stopping position without swapping the cylinder. Its 63 mm bore generates 1559 N of push force at 0.5 MPa and up to 2805 N at 0.9 MPa, driven by a 20 mm diameter single rod.
This model includes a built-in magnet, so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 197 mm, and the adjustable air cushion decelerates the piston smoothly at each end of the 275 mm stroke.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 rear screw lets technicians dial in the exact stroke end for a clamp or stop, eliminating the need to fabricate shims or reposition hard stops.
When switching between product sizes, operators adjust the stroke end to match new box dimensions. The built-in magnet provides sensor feedback to confirm the new position without mechanical rework.
As tooling or gripper pads wear, the adjustable screw recovers the lost stroke length, maintaining consistent contact pressure and cycle timing in automated assembly cells.
Choose the SCJ63 bore when the 40 mm bore's 628 N push at 0.5 MPa is too light; if you need more force, the 80 mm bore provides 2513 N. The 20 mm adjust range is ideal for commissioning tweaks or format changeovers on packaging lines. For a direct replacement, match the 63 mm bore, 275 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
At a 275 mm stroke, consider external guides or a guided cylinder if the rod sees significant side loads, as the 20 mm rod may deflect under off-axis forces. If your application does not require stroke adjustment, a fixed-stroke SC63X275-S simplifies the setup.
Adjustable-stroke checklist
At 0.5 MPa, it delivers 1559 N pushing and 1402 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, if the original is an AirTAC SCJ63 with a 275 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and a magnet. Verify the port thread and mounting style match, as SCJ cylinders do not use FB flanges or CA/CB clevis mounts.
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