The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-50STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-50STC is a double-acting, single-rod pneumatic cylinder that puts stroke fine-tuning directly in your hands via a rear-cap adjusting screw. With a 63 mm bore and a nominal 125 mm stroke, it delivers 1559 N of push force at 0.5 MPa, while the 50 mm adjustment range lets you dial in the exact stroke end position for commissioning or format changes without swapping the cylinder.
This model comes factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG sensors and a centre trunnion (TC) pivot mount, supplied with the TCM1 bracket for swinging-load applications. The 20 mm rod with M16x1.5 thread, 28 mm air cushion, and PT1/4 ports complete a robust package ready for repetitive industrial motion.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm adjustable stroke lets technicians fine-tune the end-stop position during initial machine setup, eliminating the need to shim or reposition the entire cylinder to achieve precise actuator throw.
On packaging or sorting lines, quickly adjust the stroke end to accommodate different product sizes or box dimensions without mechanical modifications, reducing downtime between batches.
In clamping or pressing fixtures, the rear screw can be advanced slightly over time to compensate for tooling wear or material compression, maintaining consistent contact force without reprogramming the machine.
Choose the SCJ63 when you need the 1559 N push force at 0.5 MPa that a 63 mm bore provides—stepping down to a 40 mm bore (628 N) may be too weak, while moving up to 80 mm (2513 N) adds bulk and air consumption. The adjustable-stroke design is ideal when the end position must be tuned on the machine; if your stroke length is fixed and never changes, a standard SC63 fixed-stroke cylinder is a simpler, cost-effective alternative.
For a direct replacement, match the 63 mm bore, 125 mm nominal stroke, 50 mm adjustment range, PT port thread, centre trunnion mounting (F-SC63TC), and built-in magnet. At 125 mm stroke, rod deflection is minimal, but for strokes over 300 mm, consider an external guide rail or a guided cylinder to manage side loads and prevent rod bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. Maximum push force at 0.9 MPa is 2805 N.
A rear-cap screw lets you shorten the stroke end by up to 50 mm from the 125 mm nominal maximum, providing a field-adjustable stop. It is a direct upgrade path from a fixed-stroke SC63, but you must match the bore, nominal stroke, PT port thread, and ensure your mounting accepts the slightly longer SCJ body. The TC centre trunnion mount on this model is for pivoting applications.
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