Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50S 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 SAIJ40BX75-50S
The AirTAC SAIJ40X75-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 25 to 75 mm. Delivering 628 N of push force at 0.5 MPa, it features a SUS304 stainless steel rod for superior corrosion resistance and an integrated magnet for CMSE and DMSE sensors. The PT tapered port threads ensure a robust, leak-free pneumatic connection.
Because the adjuster acts purely as a mechanical stop on the retract end, it allows for rapid end-position tuning during commissioning without swapping cylinders or adding external stops. Note that this adjuster is not a locking device; the cylinder cannot hold a load without live air pressure, requiring a SAIL or BSAI variant for true load-holding applications.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50S |
|---|---|
| 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 SAIJ40BX75-50S
| 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 SAIJ40BX75-50S Is Used
Product Changeovers
Dial in the exact end-stop for different product lengths on a packaging line without changing the cylinder, utilizing the 25-75 mm travel window.
Commissioning Calibration
Fine-tune the retract position during machine setup to achieve precise alignment, avoiding the need to bolt on external physical stops.
Corrosive Environments
Leverage the SUS304 stainless steel rod for light-duty positioning tasks in environments where standard carbon steel rods would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if you lack sufficient thrust, or down from a 50 mm bore (982 N) to save space. The generous 50 mm adjustment range on a 75 mm stroke is perfect for machines processing varying product sizes, enabling rapid changeovers. For load-holding without live pressure, select a SAIL or BSAI model instead.
To match this ISO 15552 interchangeable cylinder exactly, specify: 40 mm bore, 75 mm stroke, 50 mm adjustment, PT port threads, SUS304 (B) rod material, and the -S magnet option. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ40BX75-50S FAQ
The rear mechanical stopper allows you to shorten the effective stroke by up to 50 mm. This creates a usable travel window of 25 to 75 mm, enabling precise end-position tuning without altering the cylinder mounting.
At a 0.5 MPa operating pressure, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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