The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X140-50 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, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X140-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 140 mm nominal stroke by up to 50 mm without swapping the unit. At 0.5 MPa it delivers 1559 N of push force and 1402 N on the pull stroke, driven through a sturdy 20 mm diameter piston rod.
Built on a proven tie-rod platform with a 197 mm base body length, this 63 mm bore actuator includes an adjustable air cushion (28 mm length) to decelerate the piston smoothly. The rear adjusting screw sets the stroke end position precisely, making it ideal for commissioning adjustments, format changeovers, or compensating for tooling wear on production machinery.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X140-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 140 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. |
| ×140 | 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.
Dial in the exact stroke end position during machine setup using the 50 mm adjustment range, eliminating the need for custom spacer blocks or hard stops.
As clamping jaws or pressing tools wear over thousands of cycles, the rear screw can be advanced slightly to restore the original contact point without replacing the cylinder.
Quickly adapt the stroke length for different product sizes on a packaging or assembly line by adjusting the rear screw, reducing changeover time compared to swapping fixed-stroke cylinders.
Step up to an 80 mm bore if you need more force—the SCJ80 delivers 2513 N push at the same 0.5 MPa. For a simpler fixed-stroke solution where adjustability is not required, the standard SC63 series is a direct dimensional match. When replacing this model, match the 63 mm bore, 140 mm nominal stroke, 50 mm adjust range, PT1/4 port thread, and basic mounting configuration exactly.
At 140 mm stroke, the rod is well-supported within standard limits, but if your application introduces significant side loads, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing and seal from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower due to the area occupied by the 20 mm piston rod.
Yes, the SCJ63 shares the same bore, rod diameter, port size, and mounting footprint as the SC63. The SCJ63X140-50 adds a rear adjusting screw that allows you to shorten the stroke end by up to 50 mm, providing flexibility a fixed-stroke cylinder cannot.
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