The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-40 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. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-40 delivers a nominal 125 mm stroke with a 40 mm rear-cap adjusting screw, letting you dial in the exact stroke end position on the machine without swapping the cylinder. This single-rod, double-acting 80 mm bore actuator provides 2513 N of push force at 0.5 MPa and 4523 N at the maximum operating pressure of 0.9 MPa, driven by a 25 mm diameter piston rod.
Built on a robust tie-rod body with a length of 239 mm, the unit includes an adjustable air cushion (28 mm) for smooth deceleration. The PT3/8 ports and M20x1.5 rod thread make it a direct fit for standard pneumatic circuits, while the rear screw offers a 40 mm window for fine-tuning end stops during commissioning or format changes.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 40 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. |
| -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 adjusting screw allows technicians to fine-tune the stroke end position during initial machine setup, eliminating the need to shim or reposition the cylinder body for perfect alignment.
In high-cycle clamping or pressing fixtures, the adjustable stroke compensates for tooling wear over time. Operators can advance the end stop by up to 40 mm to maintain consistent contact force without replacing the actuator.
On packaging or assembly lines that run multiple product sizes, the rear screw provides a quick, tool-free method to change the cylinder's end position by up to 40 mm, reducing downtime between batches.
For applications needing more force, stepping up to the 100 mm bore SCJ100 series provides 3927 N of push at 0.5 MPa. If your load requires less force and a smaller footprint, the 63 mm bore SCJ63 delivers 1559 N. A fixed-stroke SC80 cylinder is the better choice when the stroke length is permanently fixed, as it eliminates the rear adjustment mechanism. This SCJ80X125-40 is a direct replacement for any AirTAC SCJ80 with a 125 mm nominal stroke, 40 mm adjust range, PT3/8 ports, and basic mounting. For strokes of 300 mm or more, consider an external guide rail or a guided cylinder to protect the 25 mm rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder generates 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 5026 N.
Yes, if you need the 40 mm stroke-end adjustment. The SCJ80X125-40 shares the same bore, rod diameter (25 mm), and port size (PT3/8) as the SC80 series. Ensure your mounting and overall length can accommodate the slightly longer SCJ body (239 mm) and that the 40 mm adjustment range suits your application.
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