This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX85S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI80 Standard Air Cylinder SI80BX85S
The AirTAC SI80 Standard Air Cylinder SI80BX85S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 85mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX85S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX85S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI80 Standard Air Cylinder SI80BX85S
The AirTAC SI80BX85S is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore, 85mm stroke, and a SUS304 stainless piston rod. Delivering 2513N push and 2268N pull at 0.5MPa via a G3/8 port, its direct replacement is the SAI80BX85S. This current-production SAI model maintains the exact same ISO 15552 mounting interface, bore, stroke, force, and port size for a seamless fixture swap.
The SAI80BX85S upgrades the piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The built-in magnet (-S) supports legacy CS1-B/DS1-B sensors, while a Viton H seal option can raise the operating temperature to 150C.
Airtac SI80 Standard Air Cylinder SI80BX85S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX85S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX85S |
| Bore size | Ø80 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI80BX85S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80BX85S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80BX85S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI80 Standard Air Cylinder SI80BX85S Is Used
Stainless Rod Diverter
Ideal for diverting heavy cartons on a washdown conveyor line, utilizing the 80mm bore's 2513N push force and SUS304 rod for corrosion resistance.
Press Clamping Jig
Secures heavy steel blanks in machining fixtures, relying on the 85mm stroke and robust ISO 15552 profile barrel for rigid, precise clamping.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX85S with the SAI80BX85S
To replace the discontinued SI80BX85S, order the SAI80BX85S. Confirm the ISO 15552 mounting interface, 80mm bore, 85mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet and -B SUS304 stainless rod must be specified on the new order. If you need more force, the 100mm bore yields 3927N push at 0.5MPa; if less is acceptable, the 63mm bore provides 1559N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant offers a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX85S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80BX85S FAQ
Yes, the SI80BX85S is discontinued. The direct replacement is the SAI80BX85S. It is dimensionally interchangeable per ISO 15552, matching the 80mm bore, 85mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
The 80mm bore uses a G3/8 port and features a 25mm piston rod with an M20x1.5 thread. Theoretical forces are: 2513N push and 2268N pull at 0.5MPa, 3518N push at 0.7MPa, 4523N push at 0.9MPa, and a maximum force of 513kgf at 1.0MPa. Speed range is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX85S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX85S replacement — usually within 7-8 hours.