Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20 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 SAIJ40BX85-20
The AirTAC SAIJ40X85-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 65 to 85 mm without swapping components. Built with a SUS304 stainless steel rod, it delivers 879 N of push force at 0.7 MPa, making it suitable for precise mid-range tasks. The extruded aluminum barrel includes sensor grooves on both sides.
This model uses PT tapered port threads (G1/4) and omits the FB, CA, CB, and CR mounting options, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear adjuster acts purely as a travel stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20 |
|---|---|
| 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 SAIJ40BX85-20
| 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 SAIJ40BX85-20 Is Used
End-Stop Tuning
Dial in the exact 65 to 85 mm retract position during machine commissioning to perfect part seating without machining new hard stops.
Product Changeover
Quickly adjust the stroke by up to 20 mm on a packaging line when switching to a slightly different product size.
Assembly Clamping
Utilize the 879 N push force at 0.7 MPa to hold components securely while allowing micro-adjustments to the clamping depth.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires 628 N push force at 0.5 MPa but might need slight end-position tweaks during commissioning, avoiding the need to bolt on external stops. If your setup demands higher force, stepping up to the 50 mm bore yields 982 N at 0.5 MPa. Because this is an 85 mm stroke, side-loading is minimal, but always guide the load externally for rigid stability.
To match this ISO 15552 interchangeable cylinder, specify a 40 mm bore, 85 mm stroke, 20 mm adjustment range, PT port thread, and the SUS304 (B) rod material. Note that because no magnet is specified, it will not work with CMSE or DMSE sensors. For load-holding without live air, consider the SAIL or BSAI series instead of relying on the 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 SAIJ40BX85-20 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 739 N of pull force. At the maximum 1.0 MPa pressure, it achieves 1130 N of push force.
The rear adjuster screw lets you shorten the nominal 85 mm stroke by up to 20 mm, creating a usable travel window of 65 to 85 mm. It functions as a physical stop for position tuning and requires live air to maintain pressure.
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