The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-100 is a double-acting, single-rod AirTAC cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides a full 100 mm of field-adjustable range, letting you dial in the exact 125 mm nominal stroke without swapping the cylinder or adding external hard stops. The 20 mm piston rod and PT1/4 ports deliver a push force of 1559 N at 0.5 MPa, rising to 2805 N at the maximum operating pressure of 0.9 MPa.
Built on a proven tie-rod body with a length of 197 mm, this SCJ unit includes a 28 mm air cushion to decelerate the piston quietly near stroke end. The adjustable screw sets only the stroke end position—it is not a force or speed regulator. For position sensing, a magnet can be specified with the -S suffix, allowing CMSG/DMSG/EMSG sensors to clamp directly onto the barrel.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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.
The 100 mm adjustment screw lets technicians fine-tune the end position during machine bring-up without cutting brackets or re-machining stops, cutting commissioning time on packaging and assembly lines.
On conveyor diverters and pushers where a mechanical stop wears over time, the SCJ63X125-100 can be adjusted to compensate, maintaining precise product placement without replacing the stop or cylinder.
When a production line switches between product sizes, the rear screw can quickly reset the stroke to a new verified position, avoiding the need to stock multiple fixed-stroke cylinders for each format.
Choose the SCJ63 bore when your application needs the 1559 N push force at standard plant air. If your load is lighter, stepping down to the SCJ50 bore (982 N push at 0.5 MPa) can reduce air consumption and physical size. For heavier work, the SCJ80 bore steps up to 2513 N push. This adjustable-stroke model is ideal where the final stroke length must be tuned during commissioning or after tooling wear; if your stroke is fixed and never changes, the standard SC63 fixed-stroke cylinder is a simpler, lower-cost alternative. For direct replacement, match the 63 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT thread, and basic mounting. At this 125 mm stroke, rod deflection is minimal under axial loads, but if the rod must guide an offset or side load, add an external linear guide or switch to a guided cylinder.
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 0.9 MPa, push force reaches 2805 N. The pull force is lower because the single piston rod reduces the effective area on the return stroke.
Physically, the SCJ body is slightly longer to house the adjusting screw. It can replace an SC63 if you have space for the 197 mm body length and need the 100 mm stroke-end adjustment. Ensure the port thread (PT1/4), rod thread (M16x1.5), and mounting style match your existing setup.
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