Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S
The AirTAC SAIJ40X85-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel window from 10 to 85 mm without adding external stops. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and includes a magnetic piston for precise position sensing. The extruded aluminum barrel features sensor grooves on both sides, seamlessly accommodating CMSE reed and DMSE electronic solid-state switches for flexible mounting.
Unlike fixed-stroke SAI units, this adjustable model lets you dial in the exact retract end-position during commissioning or product size changeovers. The rear screw functions strictly as a travel stop to set the end-of-stroke deceleration point alongside the variable air cushions, meaning it will not hold a load safely without continuous live air pressure. For applications requiring true load-holding without pneumatic pressure, exploring an AirTAC SAIL or BSAI clamp-lock cylinder is recommended.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAIJ40BX85-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SAIJ40BX85-75S Is Used
Product Changeover
Rapidly adjust the 10-85 mm travel window during production line changeovers to handle different package lengths without swapping out the entire cylinder assembly.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to perfectly time the mating of delicate components without relying on external mechanical spacers.
Corrosive Environments
Leverage the SUS304 stainless steel rod and 40 mm bore output for reliable thrust in food processing or chemical packaging lines where moisture is present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75S the Right Cylinder?
Choose this 40 mm bore when you need the 628 N thrust at 0.5 MPa but require extreme flexibility in the retract distance, as the 75 mm adjustment range is ideal for accommodating multiple product sizes on a single machine. If your application demands higher force, stepping up to the 63 mm bore yields 1559 N of push force at 0.5 MPa, while dropping down to the 32 mm bore reduces output to 402 N.
When replacing this unit on an ISO 15552 footprint, ensure you match the 40 mm bore, 85 mm nominal stroke, PT tapered port threads, the 75 mm adjustment code, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting the FB, CA, CB, and CR accessories. Because this specific SKU features a 16 mm rod and M12x1.25 rod thread, it handles moderate side loads well, though any long unsupported stroke still requires an external guide rail to prevent premature seal wear.
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 SAIJ40BX85-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective stroke back by up to 75 mm from the 85 mm nominal length, creating a usable travel window of 10 to 85 mm. It sets the end-position and works with the air cushions to decelerate the piston, but it is not a lock and will not hold the load without live air pressure.
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