The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X30-20 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, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X30-20 is a double-acting, single-rod pneumatic cylinder that puts stroke fine-tuning directly on the machine. A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm, so the effective stroke is field-adjustable between roughly 10 and 30 mm without swapping the cylinder or adding external hard stops. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa.
Built on the proven SC tie-rod platform, this cylinder uses PT1/4 ports, an M16×1.5 rod thread, and a 28 mm air cushion to decelerate the piston quietly. The body length A(SCJ) is 197 mm, making it a compact solution for applications where the stroke must be dialled in precisely during commissioning or after tooling wear.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X30-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 30 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. |
| ×30 | 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.
Dial in the exact actuator end-stop during machine build without cutting brackets or adding shims. The 20 mm screw adjustment lets technicians fine-tune the stroke on the fly.
Compensate for tooling or gripper jaw wear over time by slightly shortening the stroke end, maintaining consistent part contact without reprogramming the PLC.
Quickly adapt a pusher or diverter stroke for different box or pallet sizes. Operators adjust the rear screw to the new format in seconds, minimising downtime.
Choose the SCJ63 bore when your application needs roughly 1560 N of push at standard plant air. If you can accept less force in a smaller package, the SCJ50 delivers 982 N push at 0.5 MPa; stepping up to the SCJ80 gives you 2513 N. The 20 mm adjust range is ideal for fine end-position tuning—if you need a fixed, repeatable stroke with no field adjustment, the standard SC63 is a simpler, lower-cost alternative. For a direct replacement, match the 63 mm bore, nominal 30 mm stroke, 20 mm adjust range, PT thread, and basic mounting style of this SCJ63X30-20.
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. Because it is a single-rod cylinder, push force is always higher than pull force.
Yes, if the mounting and porting match. The SCJ63X30-20 has the same bore, rod, and port size as an SC63, but adds a rear adjusting screw that shortens the stroke end by up to 20 mm. Ensure your machine has clearance for the slightly longer SCJ body.
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