The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20S 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end adjustment directly on the machine. Its rear-cap screw provides up to 20 mm of field-adjustable range, letting you dial in the exact end position without swapping the cylinder. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa, scaling to 2805 N at the 0.9 MPa maximum operating pressure.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The standard PT1/4 ports and M16x1.5 rod thread keep integration simple, while the 28 mm air cushion decelerates the piston smoothly. The body length A(SCJ) is 197 mm, making it a compact choice for space-constrained stations where stroke tuning is a daily requirement.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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 fine-tune the actuator's end stop to match the exact tooling position without fabricating shims or reprogramming offsets.
In high-cycle pick-and-place systems, mechanical stops can wear over time. The SCJ's rear screw provides a quick way to advance the stroke end and maintain precise placement without replacing the cylinder.
For packaging lines that run multiple product sizes, operators can adjust the cylinder stroke end in seconds to accommodate different box heights or label positions, minimizing downtime between batches.
Choose the SCJ63 bore when your application needs around 1559 N of push force at standard plant air. If you can work with roughly 982 N, the 50 mm bore SCJ50X75-20S saves space and air consumption; for heavier tooling requiring about 2513 N, step up to the 80 mm bore. This adjustable-stroke model is the right pick over a fixed-stroke SC when you need to compensate for part tolerance, tooling wear, or format changes without mechanical stops.
For replacement, match an AirTAC SCJ63 cylinder with a 75 mm nominal stroke, 20 mm adjust range, PT thread, basic mounting, and the -S magnet option. At this 75 mm stroke, rod bending from side loads is typically not a concern, but if the load is not guided, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing.
Adjustable-stroke checklist
At 0.5 MPa, it generates 1559 N pushing and 1402 N pulling. The push force is higher because the single rod reduces the effective piston area on the return side. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, if you need field-adjustable stroke. The SCJ63 shares the same bore, rod diameter (20 mm), and mounting accessories (FA, LB, TC) as the SC63. Ensure the nominal 75 mm stroke and PT1/4 ports match, and note the SCJ body is slightly longer to house the rear adjusting screw.
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