Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20S 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 SAIJ40BX85-20S
The AirTAC SAIJ40X85-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 65-85 mm usable travel window by allowing you to trim the nominal 85 mm stroke back by up to 20 mm. In the 40 mm bore class, it delivers 879 N of push force and 528 N of pull force at a 0.7 MPa operating pressure.
This variant includes a magnet for position sensing and uses a SUS304 stainless steel rod for corrosion resistance. The extruded aluminum barrel integrates sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It features PT tapered port threads and adjustable air cushions at both ends to manage end-of-stroke impact.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20S |
|---|---|
| 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 SAIJ40BX85-20S
| 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 SAIJ40BX85-20S Is Used
End-Position Calibration
Dial in the exact retract distance within the 65-85 mm window during machine setup to perfect a pressing or clamping operation.
Product Changeover
Quickly adapt the cylinder travel for different product sizes on a conveyor line without physically swapping out the actuator.
Variable Stop Adjustment
Fine-tune the stroke end-point on the fly to compensate for mechanical wear or tooling variations in manufacturing equipment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-20S the Right Cylinder?
Select this 40 mm bore adjustable-stroke cylinder when an application requires precise end-position tuning during commissioning or product changeover without adding external stops. If you need higher thrust, stepping up to the 50 mm bore yields 1374 N push force at 0.7 MPa; stepping down to the 32 mm bore provides 563 N. The rear adjuster acts purely as a mechanical stop to set travel limits and does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series. To match this ISO 15552 interchangeable footprint, specify a 40 mm bore, 85 mm stroke, 20 mm adjustment, PT G1/4 port, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting.
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 SAIJ40BX85-20S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke from the nominal 85 mm down to as little as 65 mm. This provides a 65-85 mm adjustable travel window for fine-tuning without swapping the cylinder.
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