This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX550S, 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 SI80BX550S
The AirTAC SI80 Standard Air Cylinder SI80BX550S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX550S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX550S
- 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 SI80BX550S
The AirTAC SI80BX550S is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore, 550mm stroke, SUS304 stainless steel rod, and a piston magnet for position sensing. Delivering 2513N push force at 0.5MPa, it is replaced by the SAI80BX550S. This direct upgrade retains the exact ISO 15552 mounting interface, G3/8 port, and 2513N output force.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original SI-S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80BX550S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX550S |
| Bore size | Ø80 mm |
| Stroke | 550 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 SAI80BX550S 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 SAI80BX550S 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 SI80BX550S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×550 | 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 SI80BX550S Is Used
Long-Stroke Diversion
Actuates large diverters or sorting gates on conveyor lines, using the 550mm stroke to clear wide product flows.
Elevated Lowering
Lowers heavy fixtures or pallets, safely managing loads near the 1508N safe working threshold with stable descent.
Pallet Handling
Pushes or positions heavy pallets in automated storage systems where the 80mm bore provides robust lateral force.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX550S with the SAI80BX550S
To replace the SI80BX550S, order the SAI80BX550S. Confirm the ISO 15552 mounting interface, 80mm bore, 550mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). The -B rod is SUS304 stainless steel and the -S magnet enables position sensing. Sizing both ways: an 80mm bore yields 2513N push at 0.5MPa, while a 63mm bore offers 1559N. If you need to hold a load without live air, note that standard cylinders drift; use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Because the 550mm stroke is long, use an external guide to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX550S
- ✓ 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 SI80BX550S FAQ
Yes, the SI80BX550S is discontinued. The direct replacement is the SAI80BX550S. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 80mm bore, 550mm stroke, output force, G3/8 port, and mounting compatibility.
This double-acting cylinder features a G3/8 air port. At 0.5MPa it provides 2513N push and 2268N pull force. At 0.7MPa push is 3518N, and at 0.9MPa push is 4523N. The theoretical maximum force is 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX550S replacement — usually within 7-8 hours.