The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 550mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X550-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke range, letting you dial in the precise end position on a 550 mm nominal stroke. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, rising to 2805 N push at the 0.9 MPa maximum operating pressure.
This adjustable-stroke design uses a 28 mm air cushion to decelerate the piston smoothly, and the tie-rod construction keeps the body length A(SCJ) to 197 mm. The standard PT1/4 port and M16x1.5 rod thread make it a direct fit for common pneumatic circuits, while the rear screw eliminates the need for external hard stops when commissioning or changing machine formats.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 550 mm |
| Stroke adjustment | Up to 75 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. |
| ×550 | Nominal (maximum) stroke length in mm. |
| -75 | 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 setup, the 75 mm adjustment screw lets technicians precisely set the stroke end for a 550 mm actuator without cutting rods or adding external stops, speeding up line commissioning.
On packaging or sorting lines that switch between product sizes, the adjustable stroke allows operators to quickly reposition the end stop for different box heights or pallet layers.
In long-running clamping or pressing fixtures, the screw can be advanced to take up mechanical wear in tooling or seals, maintaining consistent contact without replacing the cylinder.
Step up to an 80 mm bore (2513 N push at 0.5 MPa) if the 63 mm force is marginal for the load, or down to a 50 mm bore (982 N push) to save air if the force is excessive. This SCJ model is ideal when the stroke end must be tuned on the machine; if the stroke is fixed and never changes, the standard SC63X550 fixed-stroke cylinder is a simpler, lower-cost alternative. For a drop-in replacement, match the 63 mm bore, 550 mm nominal stroke, 75 mm adjust range, PT1/4 port thread, and basic mounting. At 550 mm, the extended rod is prone to side-load deflection—use an external guide rail or switch to a guided cylinder if the load applies any lateral force.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The force increases linearly with pressure, reaching 2805 N push at the maximum operating pressure of 0.9 MPa.
Yes, if the mounting and porting match. The SCJ63X550-75 has the same 63 mm bore, PT1/4 ports, and tie-rod body, but adds a rear adjusting screw. Ensure you have clearance for the longer rear cap and set the screw to match your required 550 mm maximum stroke.
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