Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40S 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 SAIJ40BX85-40S
The AirTAC SAIJ40X85-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 45-85 mm from its 85 mm nominal stroke. 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 position sensing. The PT tapered port threads ensure a secure, leak-free pneumatic connection.
This adjustable-stroke design allows you to fine-tune the retract end position during commissioning without swapping hardware. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air. For load-holding without pressure, consider an external pilot-operated check valve or the SAIL lock series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40S |
|---|---|
| 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 SAIJ40BX85-40S
| 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 SAIJ40BX85-40S Is Used
Machine Setup & Changeover
Dial in the exact retract distance from 45 to 85 mm during product line changeovers without machining new hard stops.
Variable End-Stop Positioning
Fine-tune the end-of-stroke position on the fly for assembly tooling that handles multiple part sizes.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for reliable clamping and positioning in environments requiring high corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40S the Right Cylinder?
Choose this 40 mm bore when an application requires approximately 628 N of push force at 0.5 MPa, stepping up from the 32 mm bore (402 N) for heavier tasks, or down from the 50 mm bore (982 N) to save space. The 40 mm adjustment range on an 85 mm stroke is ideal for prototyping or product changeovers where the exact end-stop distance varies. An external guide is recommended if side loads are present.
To match this ISO 15552 dimensionally interchangeable cylinder, specify: 40 mm bore, 85 mm stroke, 40 mm adjustment, PT ports, SUS304 (B) rod material, and the -S magnet for CMSE reed or DMSE electronic sensors. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX85-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that trims the effective travel. For the SAIJ40X85-40-S, this creates an adjustable stroke window of 45 to 85 mm. Note that this stop does not lock the load without continuous air pressure.
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