The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-20S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly in your hands via a rear-cap adjusting screw. With a 63 mm bore and a nominal 300 mm stroke, it delivers 1559 N of push force at 0.5 MPa, while the 20 mm adjustment range lets you dial in the exact end position during commissioning or changeovers without swapping the cylinder.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm rod with M16x1.5 thread and PT1/4 ports keeps it compact, while the 28 mm air cushion at each end decelerates the piston smoothly. The SCJ body length A is 197 mm, slightly longer than a fixed-stroke SC to house the adjusting mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
The 20 mm rear screw adjustment allows operators to compensate for tooling wear or part tolerance drift without stopping production, keeping a pressing or clamping station at peak repeatability.
On packaging or sorting lines, quickly adjust the push stroke for different box sizes or product widths. The built-in magnet confirms the new position is reached every cycle.
During machine build, dial in the exact insertion depth for a press-fit operation. The 1559 N push force at 0.5 MPa handles medium assembly forces, and the sensor confirms full extension.
Step up to an 80 mm bore SCJ (2513 N push at 0.5 MPa) if your load exceeds the 63 mm bore's 1559 N capability, or drop to a 50 mm bore (982 N) to save energy on lighter tasks. For this 300 mm stroke, be mindful of side-loading—if the rod is not guided externally, consider adding a linear guide or switching to a guided cylinder to prevent rod bending. This SCJ replaces another AirTAC SCJ63 with a 300 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and magnet; match the -S suffix to retain sensor compatibility.
Adjustable-stroke checklist
At 0.5 MPa, it generates 1559 N pushing and 1402 N pulling. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Only if you need the adjustable stroke feature. The SCJ63X300-20S has the same bore, rod size, and port threads as an SC63, but the body is slightly longer (197 mm A-length) to house the adjusting screw. Ensure your mounting space can accommodate the extra length and that you match the PT port thread and magnet option.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.