The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X40-20S 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X40-20S is a double-acting, single-rod pneumatic cylinder with a 20 mm rear stroke-end adjustment, letting you fine-tune the 40 mm nominal stroke on the machine without swapping parts. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa, driven by a 20 mm diameter piston rod through PT1/4 ports.
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 sensing. The adjustable air cushion at each end is 28 mm long, smoothly decelerating loads up to the cylinder's 30-800 mm/s speed range.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X40-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Dial in the precise end-stop position during initial machine setup without cutting rails or adding hard stops, speeding up system integration.
Periodically adjust the stroke end to take up mechanical wear in tooling or grippers, maintaining consistent part contact without replacing the actuator.
Quickly reset the push-off or stop-gate position for different product sizes on a packaging line by turning the rear adjusting screw.
Step up to an 80 mm bore if your load exceeds this model's 1559 N push at 0.5 MPa—the SCJ80 offers 2513 N. For applications needing a fixed, repeatable stroke with no field adjustment, the standard SC63 series is a simpler, lower-cost alternative. To replace this unit, match the 63 mm bore, 40 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet suffix exactly.
Adjustable-stroke checklist
At 0.5 MPa, it generates 1559 N of push force and 1402 N of pull force. The pull force is lower due to the 20 mm rod reducing the effective piston area on the return stroke.
Yes, the -S suffix means it has a built-in magnet. You can mount AirTAC CMSG (reed), DMSG (solid-state), or EMSG (explosion-proof) sensors directly on the barrel to detect piston position.
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