The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X100-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X100-40 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end by up to 40 mm without removing the cylinder from the machine. At 0.5 MPa, it delivers 1559 N of push force and 1402 N on the pull stroke, making it a solid mid-range actuator for positioning tasks that need a repeatable mechanical stop.
This 63 mm bore model uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread for straightforward mounting of tooling or rod eyes. The built-in variable air cushion (28 mm long) decelerates the piston smoothly near the end of travel, and the body length A(SCJ) is 197 mm—slightly longer than a fixed-stroke SC to house the adjuster mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X100-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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 40 mm adjustment range lets technicians dial in the exact stroke end during machine commissioning without swapping cylinders or machining external hard stops.
On packaging or assembly lines, the rear screw allows quick stroke changes between product formats, reducing downtime when switching from one SKU to another.
As gripper pads or tooling tips wear over time, the adjustable stroke can be extended slightly to maintain consistent contact without replacing the entire actuator.
Step up to an 80 mm bore SCJ if your application requires more than 1559 N of push force at 0.5 MPa; the SCJ80 delivers 2513 N at the same pressure. If you never need to alter the stroke after installation, the simpler fixed-stroke SC63 is a cost-effective alternative. For a direct replacement, match the 63 mm bore, 100 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting style.
At 100 mm stroke, rod bending is rarely a concern for a 20 mm rod under axial loads, but if the cylinder experiences significant side forces, add an external linear guide or switch to a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 1.0 MPa, push force reaches 3118 N.
Yes, if you need the field-adjustable stroke feature. The SCJ63 shares the same bore, rod diameter, port size, and mounting accessories as the SC63, but the body is longer to accommodate the rear adjusting screw. Ensure your machine has clearance for the 197 mm body length and the 40 mm adjustment range.
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