The AirTAC SCJ40 Standard Cylinder SCJ40X75-75 is a genuine double-acting DOUBLE-ROD air cylinder whose rear rod carries the stroke ADJUSTER: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-75 is a double-acting, double-rod pneumatic cylinder that puts stroke-end adjustment directly on the machine. Its rear-cap screw provides a full 75 mm of adjustment, letting you dial in the exact stopping position for the 75 mm nominal stroke without dismounting the cylinder or adding external hard stops.
The adjustable air cushion decelerates the piston smoothly over a 21 mm length, and the tie-rod construction keeps the body length compact at 185 mm. It runs on filtered air at 0.15–1.0 MPa and suits standard speeds of 30–800 mm/s.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (double rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The adjuster on the rear rod sets the stroke end position. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
SCJ is double-rod: the rear rod that carries the stroke adjuster passes through the rear cover, so both piston faces lose rod area. Push is shown at the annular-area value (conservative), lower than a single-rod SC push of the same bore. 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. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 bring-up, the 75 mm adjustment range lets technicians fine-tune the end-stop position on the fly. No need to swap cylinders or machine custom spacers—just turn the rear screw to dial in the exact stroke the process requires.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke allows a single actuator to handle different push lengths. Operators can reset the stroke end in seconds when switching between formats, slashing downtime.
In clamping or pressing fixtures where tooling wears over time, the stroke-end screw provides a quick way to take up the slack. Maintenance teams can restore the correct closed position without replacing the cylinder or re-machining the tooling.
Choose the SCJ40 when you need to fine-tune the stroke end during commissioning or changeovers. For a fixed, non-adjustable stroke, the standard SC series is a simpler choice. A direct replacement must match the 40 mm bore, 75 mm nominal stroke, 75 mm adjust range, PT1/4 ports, and basic mounting. If the application involves significant side loads, pair the cylinder with an external guide rail or switch to a guided cylinder to protect the rod and bearing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. Because it is a double-rod cylinder, push force is always greater than pull force due to the rod area on the return side.
You can, provided the bore, port size, and mounting match. The SCJ adds a rear adjusting screw, so the body length A is slightly longer than the equivalent SC. Ensure you have clearance behind the cylinder for the screw and that the 75 mm adjust range covers your stroke variation needs.
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