The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-75STC 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-75STC is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a 125 mm nominal stroke, built for applications that demand fine-tuned end-position control. A rear-cap adjusting screw provides a 75 mm field-adjustable stroke range, allowing operators to dial in the exact stop point without removing the cylinder or adding external hard stops. The cylinder body length A is 197 mm, and the 20 mm diameter piston rod delivers 1559 N of push force at 0.5 MPa.
This genuine AirTAC tie-rod cylinder comes factory-equipped with a built-in magnet (S) for direct mounting of CMSG/DMSG/EMSG sensors, plus a centre trunnion (TC) pivot mount that lets the cylinder swing through an arc, absorbing misalignment in pivoting applications. The standard TPU seals and PT ports suit general industrial use from -20 to +70 °C. For format changeovers, commissioning trials, or wear take-up, the 75 mm adjustment screw saves hours of mechanical rework.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-75STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
Adjust the stroke end by up to 75 mm on the fly when switching between different box or carton sizes on a case packer, eliminating mechanical change parts.
Dial in the exact clamp position for varying workpiece thicknesses in a welding fixture or assembly press, using the rear screw for repeatable, fine-tuned pressure application.
Fine-tune the actuator's end stop during initial machine setup or compensate for tooling wear over time without re-machining stops, keeping cycle times consistent.
Choose the SCJ63 when you need about 1559 N of push force at standard shop air. If your load is lighter and space is tight, stepping down to the 50 mm bore SCJ50 reduces push force to 982 N. For heavier loads, the SCJ80 delivers 2513 N at the same pressure. The 75 mm adjustable stroke makes this cylinder ideal for machines that run multiple product heights or need end-stop tweaking after installation.
If your application does not require stroke adjustment, the fixed-stroke SC63 is a simpler, more cost-effective alternative. For a direct replacement, match the 63 mm bore, 125 mm nominal stroke, 75 mm adjust range, PT port thread, centre trunnion mount (F-SC63TC), and magnet option. With a 125 mm stroke, the rod is well-supported, but if side loads are present, consider an external guide rail or a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder delivers 1559 N of push force and 1402 N of pull force. The push force is greater because the single-rod design reduces the effective piston area on the retract side. Maximum operating force at 0.9 MPa is 2805 N push.
No. The rear adjusting screw only sets the stroke end position; it does not act as a mechanical lock or brake. If the load must be held in position when air pressure is lost, you will need an external rod lock or a pilot-operated check valve in the circuit.
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