The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X40-20TC 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X40-20TC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you up to 20 mm of fine-tuning range via the rear-cap screw. This 63 mm bore model delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, using a 20 mm diameter piston rod with an M16x1.5 thread.
Designed as a tie-rod cylinder, the SCJ series allows quick stroke adjustments during commissioning or format changes without swapping the unit. This specific model comes with a factory-fitted TC centre trunnion mount for pivoting applications, supplied with the TCM1 bracket. The adjustable air cushion decelerates the piston smoothly, and the PT1/4 ports ensure straightforward pneumatic connections.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X40-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Fine-tune the stroke end position by up to 20 mm during initial machine setup to perfectly align with mating components without needing to shim or reposition the cylinder body.
Quickly adjust the actuator stroke to handle different product sizes on a packaging line, reducing downtime between batches by simply turning the rear adjusting screw.
Take up mechanical play or compensate for seal wear over time in clamping or pressing fixtures, maintaining consistent contact pressure without replacing the cylinder.
Select the SCJ63 when your application needs the 1559 N push force at 0.5 MPa that this 63 mm bore provides. If your load is lighter, stepping down to a 50 mm bore (982 N push) can reduce air consumption and physical size; for heavier demands, the 80 mm bore offers 2513 N. The 20 mm adjustable stroke is ideal for fine-tuning end positions, but if you need a fixed, repeatable stroke every cycle, the standard SC series is a simpler choice. For pivoting loads, this TC trunnion configuration is the correct pick, using the F-SC63TC mounting kit. Note that the SCJ does not support FB flange or CA/CB clevis mounts.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 1559 N, and the pull force is 1402 N, due to the single 20 mm rod reducing the piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 3118 N.
You can, provided the 40 mm nominal stroke and PT1/4 ports match your system. The SCJ body length is slightly longer to house the adjusting mechanism, and you will need the F-SC63TC trunnion kit for mounting. The adjustable stroke adds flexibility but does not change the cylinder's force or speed capabilities.
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