The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-20S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-20S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, making it a capable mid-range actuator for applications requiring fine-tuned positioning. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection.
This 63 mm bore model uses a 20 mm diameter piston rod with an M16x1.5 male thread and PT1/4 ports. Its internal air cushion measures 28 mm to decelerate the piston smoothly. The SCJ body length A is 197 mm, and the cylinder operates within a standard pressure range of 0.15 to 1.0 MPa. The adjustable screw only sets the stroke end position; it does not alter the cylinder's force output or speed.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 end stop during machine commissioning without swapping cylinders. The 20 mm adjustment screw lets technicians dial in the exact stroke length needed for a new fixture or tool.
Quickly adapt a packaging machine's pusher stroke for different box sizes. The adjustable stroke eliminates the need to stock multiple fixed-stroke cylinders for short-run production changes.
Compensate for mechanical wear in clamping or pressing tools over time. The stroke-end screw can be advanced slightly to maintain consistent contact pressure without reprogramming the machine.
Choose the 63 mm bore when the 50 mm bore's 982 N push force at 0.5 MPa is insufficient, but the larger 80 mm bore's 2513 N is excessive for the application. This SCJ63X250-20S is the correct replacement for an existing AirTAC SCJ adjustable-stroke cylinder of identical bore, 250 mm nominal stroke, and 20 mm adjustment range, provided it also uses PT ports, a basic mount, and a magnetic piston. If your application does not require stroke-end adjustment, a fixed-stroke SC63X250-S model is a simpler, more cost-effective alternative. For strokes of 250 mm, verify that the rod is adequately supported against side loads; if lateral forces are present, consider an external guide rail or switch to a guided cylinder series.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 1559 N and the pull force is 1402 N. The maximum push force at 0.9 MPa is 2805 N. Because this is a single-rod cylinder, the pull force is always lower due to the 20 mm rod reducing the effective piston area on the retract side.
Yes, if you need the ability to adjust the stroke end. The SCJ63 shares the same bore, rod, and port specifications as the SC63. However, the SCJ body is slightly longer to house the adjusting screw mechanism. Ensure your mounting arrangement can accommodate the 197 mm body length A and that you do not require a flange or clevis mount, which are not available for the SCJ series.
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