This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX270S, 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 SI80BX270S
The AirTAC SI80 Standard Air Cylinder SI80BX270S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 270mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX270S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX270S
- 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 SI80BX270S
The AirTAC SI80BX270S is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore, 270 mm stroke, and a SUS304 stainless steel rod. Delivering 2513 N push force at 0.5 MPa, it is replaced by the SAI80BX270S. This direct successor matches the G3/8 port, M20x1.5 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and BSAI clamp-lock variants absent in the SI line.
Airtac SI80 Standard Air Cylinder SI80BX270S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX270S |
| Bore size | Ø80 mm |
| Stroke | 270 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 SAI80BX270S 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 SAI80BX270S 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 SI80BX270S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×270 | 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 SI80BX270S Is Used
Conveyor Diverter
Pushes heavy cartons off a main belt using the 2513 N push force at 0.5 MPa, with the 270 mm stroke clearing guard rails.
Pallet Stop Gate
Acts as a robust pneumatic stop for inbound pallets, leveraging the 80 mm bore and SUS304 rod to withstand humid dock environments.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX270S with the SAI80BX270S
To replace the SI80BX270S, order the SAI80BX270S. Confirm the ISO 15552 mounting interface, 80 mm bore, 270 mm stroke, G3/8 port, and your specific mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). At 270 mm, guide external rods to prevent bending. If downsizing, a 63 mm bore yields 1559 N push at 0.5 MPa; if upsizing, a 100 mm bore provides 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX270S
- ✓ 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 SI80BX270S FAQ
Yes, the SI80BX270S is discontinued. The direct replacement is the SAI80BX270S. It is dimensionally interchangeable per ISO 15552, retaining the same 80 mm bore, 270 mm stroke, G3/8 port, and mounting interface to fit existing fixtures.
The 80 mm bore features a G3/8 air port and provides 2513 N push / 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX270S replacement — usually within 7-8 hours.