The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X140-75S 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, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X140-75S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 75 mm of field-adjustable retraction from the 140 mm nominal stroke, letting you dial in the exact stop position during commissioning or changeovers without swapping the cylinder. With a 20 mm piston rod and a PT1/4 port, it delivers 1559 N of push force at 0.5 MPa.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 28 mm air cushion at each end decelerates the piston smoothly, and the body length A(SCJ) is 197 mm. It's a genuine AirTAC component, ready to simplify your setup routines.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X140-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 140 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. |
| ×140 | 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.
A packaging line running different box sizes uses the 75 mm adjustment screw to quickly reset the pusher cylinder's end-stop for each format, eliminating manual stop changes and reducing changeover time.
In a CNC welding fixture, the SCJ63X140-75S clamps parts of varying thickness. As clamp pads wear, the stroke is easily shortened via the rear screw to maintain consistent clamping force without reprogramming the machine.
R&D engineers use this cylinder on test stands to empirically find the optimal actuator stroke for a new mechanism. The 75 mm adjustable range allows rapid iteration before specifying a fixed-stroke cylinder for production.
Choose the SCJ63 bore when your application needs around 1559 N of push force at standard shop air. If you require more force, stepping up to the 80 mm bore delivers 2513 N push at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore provides 982 N. The 75 mm adjustment range on this model is ideal for processes that need a broad tuning window. If your stroke is fixed and you never need to adjust it, the standard SC63 fixed-stroke cylinder is a simpler, more economical choice. For a direct replacement, match the SCJ63 bore, 140 mm nominal stroke, 75 mm adjust range, PT port thread, and the -S magnet option. At 140 mm stroke, the rod is well-supported, but for any application where the piston rod must push an offset load, always use an external guide rail to prevent bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The pull force is lower due to the area of the 20 mm piston rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N.
You can replace another AirTAC SCJ63 with the same 140 mm nominal stroke and 75 mm adjustment range. It is not a direct dimensional drop-in for a fixed-stroke SC63, as the SCJ body is longer to house the adjusting mechanism. The mounting and port locations are designed for the SCJ tie-rod platform, not an ISO 15552 profile.
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