The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-20S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X80-20S is a 63 mm bore, double-acting single-rod cylinder with a field-adjustable stroke end. The rear-cap screw provides up to 20 mm of stroke-length reduction, letting you fine-tune the end position without removing the cylinder. It delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, driven by a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke detection. The body length A(SCJ) is 197 mm, and the pneumatic cushion is 28 mm long to decelerate the piston smoothly. Ports are PT1/4 with an M16x1.5 rod thread.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-20S |
|---|---|
| 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.
Adjust the stroke end by 20 mm during machine commissioning to dial in the exact stop position without fabricating custom hard stops or shims.
Compensate for wear on external tooling stops over time by slightly shortening the cylinder stroke via the rear screw, maintaining consistent part placement.
Quickly adapt the actuator end position for different product sizes on a packaging or assembly line, reducing mechanical changeover time.
Choose the SCJ63 bore when the 50 mm bore’s 982 N push at 0.5 MPa is marginal; stepping up gains over 50% more force. If your application does not need field stroke adjustment, the fixed-stroke SC63 is a simpler, lower-cost alternative. For guided loads, pair this with an external guide or switch to a guided cylinder.
For drop-in replacement, match an AirTAC SCJ cylinder with 63 mm bore, 80 mm nominal stroke, 20 mm adjust range, PT1/4 ports, basic mounting, and the -S magnet option. The 80 mm stroke is well within the 1500 mm maximum standard stroke for this bore.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 3118 N. The pull force is lower because the rod reduces the piston area on the return side.
Yes, if the mounting and porting match. The SCJ63 body is slightly longer to house the adjusting screw. Ensure your machine has clearance for the 197 mm body length and that you need the 20 mm stroke-end adjustment range.
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