Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S
The AirTAC SAIJ40X75-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel end-position at commissioning. With a nominal 75 mm stroke and a 40 mm adjustment range, it provides a usable travel window of 35-75 mm, letting you dial in the exact retract distance without swapping out the cylinder or adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet (-S) for position detection via AirTAC CMSE reed or DMSE electronic sensors. It uses PT tapered port threads (G1/4) and relies on variable air cushions at both ends to decelerate the load. Remember that the rear adjuster acts only as a travel stop, not a lock; it will not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-40S Is Used
Machine Changeover
Quickly adjust the retract stop from 35 to 75 mm during product size changeovers on a packaging line without disassembling the actuator.
Variable End Stops
Dial in the exact end-of-stroke position during commissioning to compensate for mechanical tolerance stack-up in fixture placement.
Forming and Pressing
Provides 628 N of push force at 0.5 MPa for light pressing tasks, with the rear screw allowing precise depth adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40S the Right Cylinder?
Choose this 40 mm bore adjustable-stroke cylinder when your application requires precise end-position tuning during machine setup or product changeover, offering a 35-75 mm travel window to accommodate varying part sizes. If you need higher force, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa, while dropping to a 32 mm bore reduces it to 402 N. Because the stroke is under 300 mm, side-load stress on the 16 mm rod and M12x1.25 thread is manageable, though external guides are still recommended for heavy lateral loads.
To replace this cylinder with an equivalent ISO 15552 unit, match the 40 mm bore, 75 mm nominal stroke, 40 mm adjustment range, PT G1/4 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting FB, CA, CB, and CR. If your process requires true load-holding without continuous air pressure, use a SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock instead of relying on the standard adjuster.
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 SAIJ40BX75-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds ranging from 30 to 800 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 75 mm down to as little as 35 mm, giving a 35-75 mm usable window. It functions as a travel stop and relies on the air cushion for deceleration, but it does not lock or hold the load without live air pressure.
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