Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75
The AirTAC SAIJ40X115-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to shorten the effective travel by up to 75 mm. This creates a highly flexible usable travel window from 40 to 115 mm, letting you dial in the exact retract end-position during commissioning without swapping out the physical cylinder. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for moderate actuation tasks.
This specific configuration features a SUS304 stainless steel rod (material code B) for superior corrosion resistance in washdown or humid environments. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of position switches. If you need position feedback, adding the -S magnet option enables the use of AirTAC CMSE reed switches or DMSE solid-state electronic sensors.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 115 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×115 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 Is Used
Machine Changeover
Dial in the 40-115 mm travel window during product size changes to set new retract positions without replacing the cylinder.
Variable End Stops
Use the rear screw to fine-tune the retraction end-position precisely during machine commissioning.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable actuation in humid manufacturing areas.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 the Right Cylinder?
Choose this 40 mm bore model when your application requires 628 N of push force at 0.5 MPa. If your process demands less force, stepping down to a 32 mm bore provides 402 N, while moving up to a 50 mm bore yields 982 N. The 75 mm adjustment range on this 115 mm stroke cylinder is ideal for machines that undergo frequent product changeovers, as it replaces the need to physically swap a fixed-stroke SAI cylinder or bolt on external stops.
Remember that the rear adjuster acts purely as a mechanical travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL pneumatic lock or BSAI clamp-lock series. This unit uses PT tapered port threads and supports the SAIJ mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers 128 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 115 mm stroke by up to 75 mm. This creates a usable travel window of 40 to 115 mm, allowing you to set the exact retract position without changing the cylinder.
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