The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-30SH is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-30SH is a double-acting, single-rod pneumatic cylinder engineered for applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 30 mm field-adjustable range, letting you dial in the exact stopping point without swapping the cylinder or adding hard stops. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at 0.9 MPa.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and Viton (FKM) seals (-H) for reliable operation in high-temperature environments from 0 to +150 °C. The 20 mm piston rod, 28 mm air cushion, and PT1/4 port thread are standard for the SCJ63 series. The body length A(SCJ) is 197 mm plus stroke, making it a compact yet powerful solution for adjustable-position clamping, pressing, and material handling.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-30SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 30 mm rear screw allows precise stroke-end adjustment during machine commissioning, eliminating the need for trial-and-error shimming or custom-length cylinders.
Quickly adapt the cylinder stroke for different product sizes on a packaging or assembly line. The Viton seals handle hot washdown environments up to 150 °C.
Fine-tune the clamp or press depth with the adjusting screw. The built-in magnet enables end-of-stroke sensing to confirm part contact or full clamp force.
Choose the SCJ63 when you need the force of a 63 mm bore—1559 N push at 0.5 MPa—with the ability to tweak the stroke end. If your load requires less force, step down to the SCJ50, which provides 982 N push at the same pressure. For higher force demands, the SCJ80 delivers 2513 N push. The adjustable stroke is ideal for commissioning trials, format changeovers, and taking up mechanical wear over time. For a fixed, non-adjustable stroke, consider the standard SC series.
This SCJ63X125-30SH is a direct replacement for any AirTAC SCJ63 with a 125 mm nominal stroke, 30 mm adjust range, PT ports, basic mounting, magnet, and Viton seals. For strokes of 300 mm or more, evaluate side-loading and rod bending; an external guide rail or a guided cylinder may be required to protect the rod bearings and ensure long service life.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (reduced due to the 20 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N.
The rear-cap screw sets the stroke end position within a 30 mm range, shortening the nominal 125 mm stroke. It is not a locking device—the piston will drift if air pressure is lost. For load holding without pressure, you must add an external rod lock or pilot-operated check valve.
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