The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-75S is a double-acting, single-rod pneumatic cylinder that puts stroke-end adjustment at your fingertips. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa, while the rear adjusting screw lets you shorten the 125 mm nominal stroke by up to 75 mm without dismounting the unit. This makes on-machine commissioning and format changeovers dramatically faster.
A built-in magnet (suffix -S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable, non-contact position sensing. The cylinder uses a 20 mm rod with M16x1.5 threads, PT1/4 ports, and a 28 mm air cushion to decelerate the piston smoothly. Its body length A(SCJ) is 197 mm, providing a compact footprint for its force class.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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 exact stroke end position during initial machine setup without fabricating custom stops. The 75 mm adjustment range covers a wide variety of trial positions.
Quickly adapt a pusher or diverter's stroke for different box or pallet sizes on a packaging line. The rear screw makes mechanical changes tool-free and repeatable.
Fine-tune the end position of a clamping or pressing operation to account for tooling wear or material thickness variations, maintaining consistent process quality over time.
Choose the SCJ63 bore when your application needs roughly 1560 N of push force. If you require more power, step up to the 80 mm bore, which provides 2513 N of push at the same 0.5 MPa. For lighter, more compact machines, the 50 mm bore offers 982 N. If your stroke never needs field adjustment, the fixed-stroke SC63 is a simpler, more cost-effective alternative. For direct replacement, match the 63 mm bore, 125 mm nominal stroke, 75 mm adjustment range, PT ports, and the built-in magnet; the basic mounting style uses the cylinder's integral threads. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider adding an external linear guide or switching to a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 1559 N of push force and 1402 N of pull force. The maximum operating force at 0.9 MPa is 2805 N push. The push force is greater than the pull force because the single rod reduces the piston area on the return side.
No. Like all standard pneumatic cylinders, the SCJ63X125-75S will not hold its position if air pressure is lost or the valve is centered. The air cushion only decelerates the piston at the end of travel, and the adjustment screw only sets the stroke end. To hold a load safely without live pressure, you must add a mechanical lock, an external rod brake, or a pilot-operated check valve.
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