The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-75S 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. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-75S is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 75 mm adjustment range on its 125 mm nominal stroke. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, making it a robust choice for applications requiring fine-tuned end-position control without swapping the cylinder.
This model includes a built-in magnet (suffix -S), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors for reliable end-of-stroke detection. The cylinder features a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread. Its tie-rod construction and 28 mm air cushion ensure smooth, decelerated stops, while the rear adjusting screw lets operators dial in the exact stroke end needed for commissioning or format changes.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×125 | 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.
The 75 mm adjustment screw allows engineers to precisely dial in the actuator's end stop during initial machine commissioning, eliminating the need for custom spacer blocks or multiple cylinder swaps to find the optimal stroke length.
On packaging or sorting lines, the adjustable stroke enables quick mechanical changeover between different product sizes. Operators can reset the push-off or stop position in seconds without dismounting the cylinder or altering the air circuit.
In high-cycle clamping or pressing fixtures, the stroke can be incrementally adjusted to compensate for tooling or pad wear over time, maintaining consistent contact pressure and cycle integrity without replacing the actuator.
Choose the SCJ80 when your application needs the 2513 N push force at 0.5 MPa that an 80 mm bore provides. If you require a more compact cylinder with less force, the 63 mm bore SCJ63 delivers 1559 N of push force at the same pressure. For higher force requirements, stepping up to the 100 mm bore SCJ100 provides 3927 N of push force. The SCJ is the correct choice over a fixed-stroke SC when you need to fine-tune the stroke end position on the machine. For a direct replacement, match an SCJ80 with a 125 mm nominal stroke, a 75 mm adjust range, PT3/8 ports, a basic mount, and a built-in magnet (-S).
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 2513 N, and the pull force on the rod side is 2268 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 4523 N. These values are identical to the fixed-stroke SC80 cylinder of the same bore.
No. The SCJ is a standard double-acting cylinder and does not have a locking or holding feature. The air cushion only decelerates the piston, and the adjusting screw only sets the stroke end. If the load must be held without live air pressure, you will need an external rod brake, a mechanical lock, or a pilot-operated check valve in the circuit.
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