The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X170-75S 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, 170mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X170-75S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 75 mm of field-adjustable stroke reduction from the 170 mm nominal maximum, so commissioning engineers can dial in the exact end position without swapping cylinders or machining external hard stops. The 16 mm diameter piston rod and PT1/4 port deliver a push force of 628 N at 0.5 MPa, making it a capable mid-bore actuator for positioning and clamping tasks.
A built-in magnet is factory-installed, allowing CMSG, DMSG, or EMSG reed and solid-state sensors to clamp directly onto the tie-rod barrel for non-contact end-of-stroke detection. The cylinder body length A(SCJ) is 185 mm, and the adjustable cushion decelerates the piston smoothly at both ends. This model uses the default TPU seal and PT thread, suiting standard compressed-air environments from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X170-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 170 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. |
| ×170 | 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 stroke end position in seconds with a wrench, eliminating the need to re-machine mounting brackets or swap cylinders for small positional changes.
On packaging or assembly lines that handle multiple product sizes, the rear screw allows operators to quickly reset the cylinder's end stop for a new format, dramatically reducing changeover downtime compared to fixed-stroke actuators.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be periodically advanced to compensate for tooling or pad wear, maintaining consistent clamp force and part contact without replacing the cylinder.
Choose the SCJ40 bore when your application needs the 628 N push force at 0.5 MPa. If you require more force, stepping up to the SCJ50 bore provides 982 N push at the same pressure; if space or force requirements are lower, the SCJ32 delivers 402 N. Because this is a 170 mm stroke, rod deflection under side load is generally minimal, but for any off-axis force, consider an external guide rail. For fixed-stroke applications where the 75 mm adjustment range is not needed, the standard SC series offers a simpler, cost-effective alternative. When replacing an existing unit, match the bore (40 mm), nominal stroke (170 mm), adjust range (-75), PT port thread, and the -S magnet option to ensure sensor compatibility.
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 1.0 MPa, the theoretical push force reaches 1280 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Yes, provided your mounting and porting are compatible. The SCJ40X170-75S shares the same bore, rod diameter, and port size as the SC40, but the body length is slightly longer to accommodate the adjusting screw mechanism. Ensure you have the clearance for the rear screw housing and that the -75 adjustment range suits your minimum stroke requirement.
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