The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-40 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X450-40 delivers a push force of 1559 N at 0.5 MPa, scaling up to 2805 N at the maximum operating pressure of 0.9 MPa. Its 40 mm rear adjusting screw allows operators to fine-tune the stroke end position without removing the cylinder from the machine, making it ideal for commissioning and format changeovers on medium-duty automation.
Built on a robust tie-rod design with a 20 mm piston rod and PT1/4 ports, this double-acting cylinder includes a 28 mm air cushion for smooth deceleration. The body length A(SCJ) is 197 mm, providing a compact footprint for its 450 mm nominal stroke.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
Dial in the precise stopping point for a material pusher on a packaging line, compensating for variations in product thickness without reprogramming the controller.
Periodically adjust the stroke end to take up mechanical wear in a clamping fixture, maintaining consistent clamping force over thousands of cycles.
Quickly adapt the cylinder's travel for different box sizes on a case erector, reducing downtime between production batches.
Step up to the 80 mm bore SCJ for 2513 N of push force at the same pressure if your load increases, or down to the 50 mm bore for 982 N if space and force requirements are lower. For applications where the stroke is fixed after initial setup, the standard SC series offers a simpler, non-adjustable alternative. This model is a direct replacement for any AirTAC SCJ63 cylinder with a 450 mm stroke and 40 mm adjustment range using PT ports and basic mounting. At this stroke length, ensure the rod is guided externally if significant side loads are present to prevent bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N. The adjusting screw does not alter the cylinder's force output.
No, like any standard pneumatic cylinder, the SCJ63X450-40 will not hold its position if air pressure is exhausted. The air cushion only decelerates the piston at the end of travel. An external rod lock or pilot-operated check valve is required for load holding.
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