The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X25-30 is a double-acting, single-rod tie-rod cylinder with a field-adjustable stroke end, letting you fine-tune the retract position by up to 30 mm without swapping the unit. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at the maximum operating pressure of 0.9 MPa, making it a strong choice for compact stations where the stroke must be dialled in precisely.
Its rear-cap adjusting screw shortens the stroke end within the -30 range, so the nominal 25 mm stroke is the maximum you can set. The cylinder uses PT1/4 ports, an M16x1.5 rod thread, and a 28 mm air cushion for smooth deceleration. The body length A(SCJ) is 197 mm, and the standard TPU seals work reliably from -20 to +70 °C.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 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. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjust range lets technicians fine-tune the retract end position to align tooling or stops without re-machining brackets or swapping cylinders.
On packaging or assembly lines running multiple product sizes, operators can quickly dial in a new stroke end for different box heights or part thicknesses, reducing changeover downtime.
In clamping or pressing fixtures where tooling surfaces wear over time, the rear screw can be adjusted to take up the slack and maintain consistent contact pressure without replacing the actuator.
Choose this 63 mm bore when a 50 mm cylinder's 982 N push at 0.5 MPa is borderline for your load; the SCJ63 gives a 59 % force increase in the same tie-rod format. If you need a fixed, non-adjustable stroke, the standard SC63 is a simpler alternative. For guided loads, pair the cylinder with an external guide or consider a guided cylinder.
This model is a direct replacement for another AirTAC SCJ63X25-30 with PT ports, basic mounting, and no magnet. The adjustable range is 30 mm, so any substitute must match the bore, nominal stroke, and this -30 adjustment value. If the application involves a side load or a stroke longer than 300 mm, add an external guide rail to protect the rod and bearing from bending moments.
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 1.0 MPa, the theoretical push force reaches 318 kgf (approx. 3118 N). Always size for the lower pull force if the cylinder works in both directions.
The rear-cap adjusting screw sets the mechanical end stop for the retract stroke, shortening it by up to 30 mm from the nominal 25 mm maximum. It is a physical stop, not a servo control. The cylinder does not hold its position if air pressure is lost or the valve is centred; for load holding without live pressure, you must add a pilot-operated check valve or an external rod lock.
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