This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX270S, 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 SI80AX270S
The AirTAC SI80 Standard Air Cylinder SI80AX270S 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 SAI80AX270S, 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 → SAI80AX270S
- 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 SI80AX270S
The AirTAC SI80AX270S is a discontinued double-acting ISO 15552 profile cylinder featuring a 270 mm stroke, a G3/8 port, and an SUS420J2 stainless steel piston rod (A option) with a built-in magnet (S). Delivering 2513 N of push force at 0.5 MPa, it is replaced by the SAI80AX270S. This direct successor shares the exact ISO 15552 mounting interface, bore, and output, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and extended life. For load holding, note that a standard cylinder drifts on air loss as the cushion only decelerates; use an external rod lock or the SAIL/BSAI variants.
Airtac SI80 Standard Air Cylinder SI80AX270S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX270S |
| 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 SAI80AX270S 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 SAI80AX270S 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 SI80AX270S
| 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 SI80AX270S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for corrosion resistance in washdown or mildly chemical machine environments requiring 2513 N push force.
Pallet Diverting
270 mm stroke pushes or diverts medium-weight pallets along handling lines, operating safely within the 1508 N working load limit.
Vertical Pressing
Applies downward clamping force; note that an external pilot check valve is required to hold the 128 kg vertical load if air pressure drops.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX270S with the SAI80AX270S
To replace the SI80AX270S, order the SAI80AX270S, confirming the ISO 15552 interface, 80 mm bore, 270 mm stroke, G3/8 port, and the SUS420J2 rod. The -S magnet supports legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. For this 270 mm stroke, ensure guide support to prevent rod bending under side loads. If you need held load capability on air loss, select the SAIL lock or BSAI clamp-lock variant instead of relying on the cushion.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX270S
- ✓ 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 SI80AX270S FAQ
Yes, the SI80AX270S is discontinued. The direct replacement is the SAI80AX270S. It shares the identical ISO 15552 mounting interface, 80 mm bore, 270 mm stroke, force, G3/8 port, and accessories, fitting seamlessly into existing fixtures.
This double-acting cylinder has a G3/8 port. The force ratings are 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical maximum of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX270S replacement — usually within 7-8 hours.