Airtac SCJ40 Standard Cylinder SCJ40X75-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-75S 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke75 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X75-75S
The SCJ40X75-75S is a double-acting, single-rod AirTAC cylinder that puts stroke-end tuning directly in your hands. Its rear adjusting screw provides a full 75 mm of adjustment, letting you dial in the exact stop position for commissioning or format changes without swapping the cylinder. With a 40 mm bore, it delivers 628 N of push force at 0.5 MPa, making it a capable workhorse for precise positioning tasks.
This model includes a built-in magnet, so standard CMSG/DMSG/EMSG sensors clip directly onto the tie-rod barrel for reliable end-of-stroke detection. The 16 mm diameter piston rod and PT1/4 pneumatic ports keep it compact, while the 21 mm air cushion at each end protects the seals and reduces noise. The body length A is 185 mm, providing a sturdy platform for dynamic applications.
Airtac SCJ40 Standard Cylinder SCJ40X75-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-75S |
|---|---|
| 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 (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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X75-75S
| 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X75-75S Is Used
Commissioning & Setup
Fine-tune the actuator end-stop during machine bring-up without fabricating custom hard stops, saving hours of mechanical rework.
Adjustable Part Stops
Create a variable end-position gate on a conveyor line. Operators can quickly change the stop point for different product sizes using the rear screw.
Wear Compensation
In high-cycle clamping fixtures, use the 75 mm adjuster to periodically take up mechanical wear on tooling, maintaining consistent clamp force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X75-75S the Right Cylinder?
Step up to the SCJ50 series if your load requires the 982 N push force available from the 50 mm bore at the same 0.5 MPa pressure. If your application does not need field-adjustable stroke, the fixed-stroke SC40 series offers the same bore and mounting footprint at a lower cost. For a direct replacement, match a genuine AirTAC SCJ40X75-75S cylinder with a PT port, basic mount, and built-in magnet.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X75-75S FAQ
The rear-cap screw limits the piston's extend stroke. You can shorten the nominal 75 mm stroke by up to 75 mm, effectively setting any stroke end between 0 and 75 mm. It adjusts the stop position, not the cylinder's force or speed.
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, the push force reaches 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
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