The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-20 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-20 delivers up to 1559 N of push force at 0.5 MPa from a 63 mm bore, with a 20 mm rear adjusting screw that lets you fine-tune the stroke end position in the field without swapping the cylinder. Its 20 mm piston rod and 28 mm air cushion work together to handle mid-range clamping, pressing, and positioning tasks where the exact stroke length must be dialled in during commissioning or changeover.
This double-acting, single-rod cylinder uses a PT1/4 port and has a body length A of 197 mm. The adjustable stroke end is purely mechanical, setting the retract limit within a 20 mm window while the full 225 mm nominal stroke remains available for the extend motion. Operating pressure spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, and the standard TPU seals cover -20 to +70 °C.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 225 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. |
| ×225 | 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 lets technicians fine-tune the retract stop during initial machine setup without removing the cylinder, speeding up line commissioning for packaging or assembly stations.
On multi-product conveyor lines, the adjustable stroke allows operators to quickly reset a stop gate or diverter position when switching between different box or pallet sizes.
In clamping or pressing fixtures, the stroke end can be adjusted to take up pad wear or material thickness variation over time, maintaining consistent clamp force without mechanical shims.
Choose the SCJ63 bore when your application needs roughly 1560 N of push force at standard shop air. If you need more force, the SCJ80 bore steps up to 2513 N push at 0.5 MPa; if you can accept less, the SCJ50 bore provides 982 N. This adjustable-stroke model is the right pick when the stroke end must be trimmed on the machine—during format changeovers or to compensate for tooling wear—where a fixed-stroke SC63 would require shims or external stops.
For a direct replacement, match the 63 mm bore, 225 mm nominal stroke, 20 mm adjust range, PT1/4 port thread, and basic mounting. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion (with TCM1 bracket) using the F-SC63 pattern; flange FB and clevis CA/CB are not available on this series. At 225 mm stroke, rod buckling is not a primary concern under axial loads, but if the load applies significant side force, consider an external guide rail or a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 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.
A screw in the rear cap mechanically limits how far the piston can retract, shortening the stroke end by up to 20 mm. The 225 mm nominal stroke is the maximum; you can reduce it anywhere within that 20 mm range. It does not adjust speed, force, or the extend limit—only the retract end position.
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