The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-10S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 10 mm of fine adjustment, letting you dial in the exact stroke without swapping the cylinder. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty positioning tasks.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 20 mm rod and PT1/4 ports keep it compatible with common pneumatic circuits, while the 28 mm air cushion decelerates the piston smoothly at both ends. Body length A(SCJ) is 197 mm.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 10 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Fine-tune the stroke end during machine commissioning to compensate for assembly tolerances, ensuring perfect alignment with mating parts without needing shims or custom brackets.
In clamping or pressing fixtures, use the 10 mm adjustment to take up slack as tooling or workpieces wear over time, maintaining consistent clamping force and cycle quality.
Quickly adapt the cylinder's end position when switching between product sizes on a packaging or sorting line, reducing downtime compared to swapping a fixed-stroke cylinder.
Step up to the 80 mm bore if you need more than 1559 N push at 0.5 MPa; the SCJ80 provides 2513 N. If your application requires a fixed, non-adjustable stroke, the standard SC63 cylinder is a direct alternative. For a drop-in replacement, match the 63 mm bore, 125 mm nominal stroke, 10 mm adjust range, PT ports, basic mounting, and the -S magnet option. At this 125 mm stroke, side-loading is generally minimal, but for off-centre loads, consider an external guide rail or a guided cylinder to protect the rod bearing.
Adjustable-stroke checklist
Push force at 0.5 MPa is 1559 N, and pull force is 1402 N. 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.
Only if you no longer need stroke adjustability. The SCJ63X125-10S allows you to shorten the stroke end by up to 10 mm via the rear screw. A fixed-stroke SC63 would require external stops or a different mounting setup to achieve the same fine-tuned position.
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