The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X100-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X100-20 is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end control. Operating at 0.5 MPa, it delivers 1559 N of push force and 1402 N on the pull stroke, making it a robust choice for applications where the final stop position needs fine-tuning during commissioning or changeover.
This 63 mm bore model uses a 20 mm piston rod with an M16x1.5 thread and PT1/4 ports. The integrated air cushion is 28 mm long, and the body length A measures 197 mm. The screw only sets the stroke end position; it does not alter the cylinder's force output or speed, ensuring consistent performance within the 100 mm nominal stroke.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X100-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 20 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. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
During machine setup, the 20 mm adjusting screw lets technicians precisely set the retract stroke end to align tooling or stops, eliminating the need to fabricate custom shims or mechanical stops.
Quickly adjust the stroke end for different box or carton sizes on a packaging line. The SCJ63X100-20 allows operators to change the stopping position in seconds, reducing downtime between product runs.
In a clamping or pressing fixture, the adjustable stroke can be used to take up for pad or tooling wear over time. The screw is advanced to maintain consistent clamping force without replacing the cylinder.
Choose the SCJ63X100-20 when you need to dial in a precise end-of-stroke position on the machine without swapping cylinders. If 1559 N of push force at 0.5 MPa is insufficient, stepping up to the 80 mm bore provides 2513 N. For applications that do not require field adjustability, the fixed-stroke SC63X100 is a simpler, more economical alternative. A direct replacement must match the 63 mm bore, 100 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting.
For this 100 mm stroke, side-loading is generally not a concern if the load is guided, but always align the rod with the load axis to prevent bending. If the application involves unguided side forces, consider adding an external guide rail or switching to a guided cylinder assembly.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 1402 N at 0.5 MPa due to the area of the 20 mm piston rod. The theoretical maximum force at 1.0 MPa is 318 kgf.
A rear-cap screw mechanically limits the piston's retract stroke end, adjustable by up to 20 mm on this model. Choose the SCJ when you need to fine-tune the stroke end position in the field for setup, format changes, or wear compensation. A fixed-stroke SC cylinder is the better choice when the stroke length is a fixed, never-changing specification.
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