The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-20S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the 400mm nominal stroke by up to 20mm using the rear-cap screw. This 63mm bore unit delivers a substantial 1559 N of push force at 0.5 MPa, making it a robust choice for mid-range industrial positioning tasks where commissioning or format changes demand on-the-fly adjustment without swapping the cylinder.
Equipped with a built-in magnet (-S suffix), this model is ready for direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors for precise end-of-stroke detection. It features a 20mm piston rod, PT1/4 ports, and a 28mm air cushion for smooth deceleration. The body length A(SCJ) is 197mm plus stroke, and it operates reliably within a -20 to +70°C range with the standard TPU seal.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 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. |
| ×400 | 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 commissioning, the 20mm adjustment screw allows engineers to precisely dial in the stroke end position for a 400mm actuator without needing to re-machine mounts or swap cylinders, saving hours of setup time.
In a pneumatic clamping fixture, the adjustable stroke can compensate for wear on clamp pads or workpieces over time. The operator can easily extend the stroke end by a few millimeters to maintain consistent clamping force.
On a packaging line, switching between box sizes often requires a different pusher stroke. The SCJ63X400-20S allows a quick manual adjustment of up to 20mm, enabling a single cylinder to handle multiple formats without any disassembly.
Select the SCJ63X400-20S when your application requires a 400mm stroke with the flexibility to shorten it by up to 20mm for fine-tuning end positions. If 1559 N of push force at 0.5 MPa is insufficient, stepping up to the 80mm bore provides 2513 N. For a lighter, more compact solution, the 50mm bore offers 982 N. A fixed-stroke SC63 cylinder is the better choice if the stroke length is permanent and never needs field adjustment. For strokes of 300mm or more like this 400mm unit, be mindful of side-loads on the 20mm rod; an external guide or a guided cylinder is recommended to prevent rod bending and ensure long seal life. This SCJ cylinder is a direct replacement for another AirTAC SCJ63 with a 400mm nominal stroke, 20mm adjust range, PT ports, basic mounting, and a magnet.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 1559 N of push force and 1402 N of pull force. The maximum push force at the 1.0 MPa operating limit is 2805 N. The pull force is lower due to the area of the 20mm piston rod.
The rear-cap adjusting screw sets the physical end-stop for the piston's extend stroke, allowing you to shorten the 400mm nominal stroke by up to 20mm. It is not a locking or holding device; if air pressure is lost, the piston rod can be moved. For load holding without pressure, you need an external rod lock or a pilot-operated check valve.
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