The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-30 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 SCJ63X125-30 is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a 125 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows precise fine-tuning of the piston's stop position without replacing the cylinder or adding external hard stops, making it ideal for commissioning and process changeovers. The cylinder delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, while the pull force is 1402 N at 0.5 MPa due to the 20 mm piston rod.
Built on a durable tie-rod construction, this SCJ model uses a PT1/4 port and an M16x1.5 rod thread. The integrated air cushion, with a cushion length of 28 mm, decelerates the piston smoothly at the end of travel, reducing impact and noise. The standard body length A(SCJ) is 197 mm, making it a compact solution for applications where the stroke endpoint must be dialed in with millimeter precision during setup or maintenance.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-30 |
|---|---|
| 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 adjusting screw allows technicians to quickly recalibrate the piston's end position during machine commissioning or after maintenance, ensuring precise alignment with fixtures or tooling without mechanical modifications.
On a packaging line, the stroke can be adjusted to accommodate different box heights. The 125 mm nominal stroke with a 30 mm reduction range allows a single cylinder to handle multiple product formats, minimizing changeover time.
In a clamping or pressing application, the stroke end can be incrementally extended by backing off the screw to compensate for wear on a consumable tool or pad, maintaining consistent clamp force without replacing the actuator.
Choose the SCJ63X125-30 when you need a robust mid-range force actuator with the flexibility to fine-tune the stroke end position by up to 30 mm on the machine. If your application requires a higher force, stepping up to an 80 mm bore provides 2513 N of push force at 0.5 MPa. For a lighter, more compact solution, the 50 mm bore delivers 982 N. This adjustable-stroke model is the right choice over a fixed-stroke SC cylinder when your design involves a variable end position, such as for different product sizes or to compensate for tooling wear. If the load requires a rigid, guided motion to prevent rod bending, especially with a 125 mm stroke, consider pairing the cylinder with an external guide or switching to a guided cylinder.
For a direct replacement, match this model with another AirTAC SCJ adjustable-stroke cylinder of the same 63 mm bore, 125 mm nominal stroke, and 30 mm adjust range. Ensure the replacement has the same PT port thread and basic mounting configuration. If a built-in magnet is needed for sensor feedback, specify the -S suffix.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, the SCJ63X125-30 is dimensionally compatible with a standard SC63X125 cylinder in terms of mounting footprint, but the body is slightly longer to accommodate the adjusting mechanism. It provides the added benefit of a 30 mm adjustable stroke end. Ensure the port thread (PT) and mounting style match your current setup.
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