The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-50S is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 250 mm stroke, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable range for the stroke end. This model includes a built-in magnet, allowing direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback without external brackets. It delivers a substantial push force of 1559 N at 0.5 MPa, making it a capable actuator for medium-duty industrial tasks.
With a 20 mm diameter piston rod and PT1/4 ports, this cylinder is built for reliable cycling in filtered air systems. The adjustable air cushion, with a 28 mm cushion length, decelerates the piston smoothly at both ends, protecting the end caps during high-speed operation. The body length A is 197 mm plus the stroke, and the adjustment screw lets technicians fine-tune the retract end position to accommodate tooling wear, format changes, or precise setup requirements without removing the cylinder from the machine.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm adjustment screw allows commissioning engineers to dial in the exact retract stop position on a new assembly line without fabricating custom shims or hard stops, saving hours of setup time.
On a conveyor diverter gate, the adjustable stroke can be periodically shortened by a few millimeters to compensate for wear on the gate seal, maintaining a perfect seal without replacing the actuator.
In a packaging machine, operators can quickly adjust the stroke end to handle different box sizes. The built-in magnet provides a confirmation signal to the PLC that the new position is reached, ensuring a safe changeover.
Select the SCJ63 bore when your application requires a push force around 1559 N at standard plant pressure; for a lighter load, stepping down to a 50 mm bore (982 N push) can reduce air consumption and physical size. If a fixed stroke is sufficient and the adjustability is not needed, the standard SC63 cylinder offers the same force and mounting footprint at a lower cost. For applications with high side loads or a 250 mm stroke, consider adding an external guide rod assembly or switching to a guided cylinder to prevent rod bending and ensure long seal life.
This SCJ63X250-50S is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 63 mm bore, 250 mm nominal stroke, and a 50 mm adjustment range, provided the port thread is PT and the magnet sensor option is required. When replacing, match the mounting style; this basic body can be fitted with FA front flange, LB foot, or TC centre trunnion kits (e.g., F-SC63TC) from the SCJ accessory subset.
Adjustable-stroke checklist
The push force is calculated using the full 63 mm bore area. At 0.5 MPa it is 1559 N, and at the maximum operating pressure of 0.9 MPa it reaches 2805 N. The pull force is lower due to the 20 mm rod area, providing 1402 N at 0.5 MPa.
No. Like all standard pneumatic cylinders, the SCJ will not hold its position if air pressure is lost or the valve is centered. The adjusting screw only sets the mechanical end-of-stroke position; it is not a locking device. For mid-stroke holding, you must add an external rod lock or a pilot-operated check valve.
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