The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-20 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X80-20 is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly on the machine. Its rear-cap adjusting screw gives you up to 20 mm of field-adjustable stroke-end reduction, so you can dial in the exact stopping position during commissioning or format changeovers without swapping the cylinder. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa.
This model uses a 20 mm diameter piston rod with M16x1.5 male threads and PT1/4 ports. The built-in variable air cushion (28 mm long) decelerates the piston quietly at stroke end. The body length A(SCJ) is 197 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. It is a genuine AirTAC tie-rod cylinder built for reliable field adjustment.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 80 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. |
| ×80 | 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.
Technicians can fine-tune the actuator's end position in 20 mm increments during initial machine bring-up, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error setup.
In clamping or pressing fixtures, the adjustable stroke can be periodically shortened to compensate for mechanical wear on tooling or contact surfaces, maintaining consistent clamping force without replacing parts.
On a packaging line, operators can quickly adjust the stroke end to accommodate different product sizes or case dimensions, reducing downtime during format changes with a simple screw adjustment.
Choose the SCJ63 when you need the 1559 N push force at 0.5 MPa that the 63 mm bore provides. If your application requires more force, step up to the SCJ80, which offers 2513 N of push at the same pressure. For lighter, more compact machines, the SCJ50 delivers 982 N. This adjustable-stroke model is ideal when the exact stroke length must be determined empirically on the machine; if the stroke is fixed and known, the standard SC series offers a simpler, more cost-effective solution. For replacement, match the 63 mm bore, 80 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting. If your application involves a long, unsupported stroke, consider an external guide or a guided cylinder to protect the rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. Since it is a single-rod cylinder, the push force is greater than the pull force because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N.
Yes, the SCJ63X80-20 is dimensionally compatible with the SC63 series for mounting and porting, though its body is slightly longer (197 mm A-length) to house the adjusting screw. The 20 mm adjust range lets you shorten the stroke end in the field. Ensure the port thread (PT), mounting style, and any magnet option match your existing setup.
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