Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S 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 SAIJ40BX85-50S
The AirTAC SAIJ40X85-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 628N of push force at 0.5 MPa. Its defining characteristic is the 50mm adjustment range, which transforms the 85mm nominal stroke into a highly flexible 35-85mm usable travel window. This allows you to dial in the exact end position at commissioning without swapping hardware.
Built for position feedback, this variant includes a magnet for CMSE reed and DMSE electronic sensors, and uses a SUS304 stainless steel rod for superior corrosion resistance. Fluid is filtered air, operating pressure is 0.15-1.0 MPa, and it features variable air cushions at both ends. The extruded aluminum barrel provides sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S |
|---|---|
| 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 SAIJ40BX85-50S
| 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 SAIJ40BX85-50S Is Used
Product Changeovers
Quickly reconfigure the 35-85mm travel window for different product sizes on a packaging line without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact material feed lengths without adding external stops.
Sensor-Driven Operations
Leverage the integrated magnet with DMSE electronic sensors for precise position detection in automated assembly tasks.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S the Right Cylinder?
Choose this 40mm bore when you need precise retract-end tuning across a 35-85mm window, stepping up from a 32mm bore (402N push at 0.5 MPa) if your load requires more thrust, or down to a smaller size if 628N is excessive. The adjustable stroke is ideal for product changeovers on a line, functioning as a travel stop rather than a lock. If your process requires holding a load without live air pressure, select a SAIL or BSAI cylinder instead.
For ISO 15552 interchangeability, match the 40mm bore, 85mm nominal stroke, 50mm adjuster, PT tapered port threads, and the -S magnet option. The 16mm rod and M12x1.25 thread provide robust load handling, though any stroke near or over 300mm would require an external guide to prevent excessive side-loading. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, 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 SAIJ40BX85-50S FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop, allowing you to trim the 85mm nominal stroke back by up to 50mm, creating a usable travel window of 35-85mm. It does not lock the load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.