Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S
The AirTAC SAIJ40X145-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a 628N push force at 0.5 MPa and features a 16mm SUS304 stainless steel rod. By turning the external rear stopper screw, you can shorten the effective stroke, providing a usable travel window of 70 to 145 mm without changing the cylinder itself.
This model includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. It uses PT tapered ports and supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAIJ40BX145-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SAIJ40BX145-75S Is Used
Machine Setup Tuning
Fine-tune the retract end-position during commissioning to dial in exact stops without adding external spacers.
Product Size Changeover
Adjust the 70-145mm travel window quickly on packaging lines when handling different carton sizes.
Variable End Stops
Use the rear screw to set precise end-of-stroke positioning for assembly presses requiring strict repeatability.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-75S the Right Cylinder?
Choose this 40mm bore when you need more force than the 32mm version (402N push at 0.5 MPa) but less than the 50mm class (982N). The 75mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact end-position at commissioning rather than machining external stops or swapping to a fixed-stroke SAI cylinder.
For an exact ISO 15552 replacement, match the 40mm bore, 145mm stroke, 75mm adjustment, PT port thread, SUS304 rod, and -S magnet. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series. Since the 145mm stroke is under 300mm, side-load concerns are minimal, but long unsupported strokes still need an external guide.
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 SAIJ40BX145-75S FAQ
At 0.5 MPa it provides a 628N push force and a 528N pull force. At 0.7 MPa the push force increases to 879N.
The rear adjuster screw lets you trim the 145mm nominal stroke back by up to 75mm, creating a usable travel window of 70 to 145mm. The adjuster is a stop, not a lock, so it cannot hold the load without live air pressure.
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