The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-40S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X350-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 40 mm of adjustment from the 350 mm nominal stroke, letting you dial in the exact stopping position during commissioning or after tooling wear without dismounting the cylinder. The built-in magnet allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection.
With a 63 mm bore and 20 mm rod, this cylinder delivers 1559 N of push force at 0.5 MPa and can reach 2805 N at the maximum operating pressure of 0.9 MPa. The 28 mm air cushion at each end decelerates the piston smoothly, and the PT1/4 port supplies ample flow for speeds up to 800 mm/s. The body length A(SCJ) is 197 mm plus stroke, making it a compact choice for applications where a fixed-stroke SC would require external hard stops.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 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. |
| ×350 | 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 fine-tune the push stroke end-stop on a new assembly line without fabricating custom hard stops, speeding up machine runoff.
On packaging or filling lines, operators can quickly dial the stroke back when switching between product sizes, eliminating mechanical change parts at the actuator.
As gripper pads or press tooling wear down over thousands of cycles, the rear screw can be advanced to restore the exact tooling contact point without replacing the cylinder.
Choose the SCJ63 bore when your load needs roughly 1560 N of push at standard plant pressure; if you can work with about 980 N, the smaller SCJ50 (982 N push at 0.5 MPa) saves space and weight, while the SCJ80 steps up to 2513 N for heavier tooling. Because the nominal stroke is 350 mm, rod bending under side load becomes a real concern—add an external linear guide or consider a guided cylinder if the load is not perfectly axial. This model is the direct replacement for any AirTAC SCJ63X350-40S with PT ports, basic mounting, and a magnet-equipped barrel; match the bore, nominal stroke, 40 mm adjust range, and sensor compatibility for a drop-in swap.
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 piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, if you need field-adjustable stroke. The SCJ63X350-40S shares the same bore, rod diameter, and port size as the SC63, but the body is slightly longer to house the adjusting screw. Ensure your mounting and sensor setup accommodates the extra rear-cap length.
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