The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-75S 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. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-75S is a double-acting, single-rod pneumatic cylinder that delivers 628 N of push force at 0.5 MPa, making it a capable mid-bore actuator for tasks requiring a field-tunable stroke end. Its 75 mm rear-cap adjustment range lets you fine-tune the 80 mm nominal stroke on the fly, which is invaluable during commissioning, format changeovers, or for taking up mechanical wear without replacing the cylinder.
This specific model includes a built-in magnet, allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the barrel for precise end-of-stroke or mid-stroke position feedback. The 40 mm bore uses a 16 mm diameter piston rod, PT1/4 ports, and an M12x1.25 rod thread, with a 21 mm air cushion to decelerate the piston smoothly at the end of travel.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single 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 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 range lets technicians dial in the exact stroke end position during initial machine setup without swapping cylinders or machining hard stops, drastically reducing commissioning time.
On packaging lines, the adjustable stroke allows a single pusher or diverter to be quickly reconfigured for different box or product sizes by simply turning the rear screw, eliminating mechanical change parts.
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ40 series when your application needs an adjustable stroke in the 628 N push force class at 0.5 MPa. If you require more force, stepping up to the 50 mm bore provides 982 N of push force at the same pressure, while a step down to the 32 mm bore offers 402 N for lighter, more compact tasks. This SCJ adjustable-stroke unit is ideal when the end position needs frequent tweaking; if your stroke is fixed and never changes, the standard SC series is a simpler, more economical choice.
For a direct replacement, match the 40 mm bore, 80 mm nominal stroke, 75 mm adjustment range, PT port thread, and the S magnet option. Ensure any new mounting hardware, such as an FA front flange or LB foot mount, matches the SCJ40 accessory pattern. For strokes of 300 mm or more, consider an external guide or a guided cylinder to manage side loads and prevent rod bending.
Adjustable-stroke checklist
The push force is 628 N at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single rod's area differential, providing 528 N at 0.5 MPa. The 75 mm adjustment screw does not change the force output.
You can, provided the bore (40 mm), nominal stroke (80 mm), and port thread (PT1/4) match. The SCJ body is slightly longer than a fixed-stroke SC to house the adjusting screw. You must also ensure the SCJ's rear adjustment screw does not interfere with your machine's mounting structure.
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