The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-100S 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 SCJ63X125-100S delivers up to 1559 N of push force at 0.5 MPa in a double-acting, single-rod package, giving you the muscle of a 63 mm bore with the flexibility to fine-tune the stroke end on the machine. A rear adjusting screw provides a full 100 mm of adjustment range, letting you dial in the exact stopping position without swapping cylinders or fabricating external hard stops.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 20 mm rod, PT1/4 ports, and 28 mm air cushion ensure smooth deceleration, while the 197 mm body length keeps the footprint compact for its force class.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-100S |
|---|---|
| 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.
During machine bring-up, technicians use the 100 mm adjustment range to experimentally find the ideal stroke end for part placement, eliminating the need to stock multiple fixed-stroke cylinders for trial runs.
When a packaging machine switches between box sizes, the rear screw is quickly reset to match the new pusher stroke, reducing changeover time from minutes to seconds compared to mechanical stop repositioning.
In high-cycle clamping fixtures, the adjustable stroke end takes up wear on gripper pads or tooling over time, maintaining consistent clamp force without reprogramming the PLC or adding shims.
Step up to an 80 mm bore (2513 N push at 0.5 MPa) if your load exceeds the 63 mm bore's capacity, or down to a 50 mm bore (982 N) to save space and air consumption on lighter tasks. If your application does not require field-adjustable stroke, the fixed-stroke SC63 series offers a simpler, lower-cost alternative. For a direct replacement, match an SCJ63X125-100S with PT ports, basic mounting, and the -S magnet option.
At a 125 mm nominal stroke, rod deflection is generally minimal, but if the load applies a significant side force or the cylinder is fully extended under high acceleration, consider an external guide rail or switching to a guided cylinder to protect the rod bearing and piston seals from premature wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder produces 1559 N of push force and 1402 N of pull force (the pull force is lower because the 20 mm rod reduces the piston area on the return side). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 318 kgf.
The rear-cap adjusting screw sets only the stroke end position, shortening the nominal 125 mm stroke by up to 100 mm. The retracted position is fixed. It is a mechanical stop, not a speed or force control—you must still set the directional valve and flow controls separately for speed regulation.
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