The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-40 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides a 40 mm field-adjustable range, letting you dial in the exact end position without swapping the cylinder or adding external hard stops. With a 63 mm bore and 20 mm piston rod, it delivers 1559 N of push force at 0.5 MPa, scaling up to 2805 N at the maximum 0.9 MPa operating pressure.
This model has a nominal 225 mm stroke and a 28 mm air cushion at each end for smooth deceleration. The body length A(SCJ) is 197 mm, making it slightly longer than a fixed-stroke SC of the same bore. It uses a PT1/4 port and an M16x1.5 rod thread, and is built on the proven tie-rod platform with a TPU seal for standard -20 to +70 °C service.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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 40 mm screw adjustment lets technicians quickly dial in the exact stroke end during machine commissioning, eliminating the need to fabricate custom shims or reposition external stops.
On packaging or assembly lines running multiple product sizes, the adjustable stroke allows operators to reset the cylinder's end position for a new format in seconds without tools or cylinder swaps.
In clamping or pressing fixtures, the stroke-end screw can be advanced periodically to take up mechanical wear in tooling or seals, maintaining consistent clamp force and part contact over the cylinder's service life.
Choose the SCJ63 bore when your application needs the 1559 N push force at standard plant air. If you can accept a lower force in a smaller package, the 50 mm bore provides 982 N push at 0.5 MPa. For higher force requirements, step up to the 80 mm bore, which delivers 2513 N push at the same pressure. The 40 mm adjustment range on this model is ideal for commissioning trials and format changeovers where the stroke end must be precisely dialed in.
This adjustable-stroke cylinder is the right pick when you need to fine-tune the end position; if your stroke is fixed and never changes, the standard SC63 fixed-stroke cylinder is a simpler, more cost-effective alternative. For a direct replacement, match the 63 mm bore, 225 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting. At this stroke length, ensure the rod is not subjected to high side loads—use an external guide rail or switch to a guided cylinder if lateral forces are present.
Adjustable-stroke checklist
At 0.5 MPa, it produces 1559 N pushing and 1402 N pulling. The force increases with pressure: 2182 N push at 0.7 MPa and 2805 N push at the maximum operating pressure of 0.9 MPa. Because it is a single-rod cylinder, the push force is always higher than the pull force due to the rod area.
A rear-cap adjusting screw lets you shorten the stroke end by up to 40 mm from the nominal 225 mm maximum. You turn the screw to set the precise stopping point. Choose the SCJ when you need to fine-tune the stroke on the machine for setup, changeover, or wear take-up. If your stroke is permanently fixed, the standard SC63 fixed-stroke cylinder is a simpler choice.
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