This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX55S, 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 SI80AX55S
The AirTAC SI80 Standard Air Cylinder SI80AX55S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 55mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80AX55S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke55 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80AX55S
- 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 SI80AX55S
The AirTAC SI80AX55S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 2513 N push force at 0.5 MPa. This 80 mm bore unit features a SUS420J2 stainless piston rod (-A) and a built-in magnet (-S) for legacy CS1-B/DS1-B switches. Its direct replacement is the SAI80AX55S, matching the G3/8 port, M20x1.5 thread, and 36 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI80 Standard Air Cylinder SI80AX55S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX55S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX55S |
| Bore size | Ø80 mm |
| Stroke | 55 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 SAI80AX55S 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 SAI80AX55S 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 SI80AX55S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×55 | 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 SI80AX55S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for mid-force clamping and positioning in environments where moisture or minor corrosive elements would degrade standard carbon steel.
Short-Stroke Diverting
Uses the 55 mm stroke to push packages or redirect product flows at 2513 N push force, fitting neatly into compact transfer stations.
Pallet Stop Gates
Acts as a robust 80 mm bore stopper on roller conveyors, providing reliable physical resistance for heavy pallets up to 128 kg vertical lift capacity.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX55S with the SAI80AX55S
To replace the SI80AX55S, order the SAI80AX55S. It is dimensionally interchangeable per ISO 15552, preserving the exact 80 mm bore, 55 mm stroke, 2513 N output, G3/8 port, and mounting interface. Confirm your thread (PT/G/NPT) and mounting accessory (LB, FA, TC, etc.). The -S magnet enables CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. If sizing up or down, note the 63 mm bore yields 1559 N push while the 100 mm bore yields 3927 N at 0.5 MPa. 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 variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX55S
- ✓ 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 SI80AX55S FAQ
Yes, the SI80AX55S is discontinued. The direct replacement is the SAI80AX55S. It shares the same ISO 15552 mounting interface, 80 mm bore, 55 mm stroke, output force, G3/8 port, and accessories, fitting directly into existing fixtures.
The 80 mm bore delivers 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 max force of 513 kgf at 1.0 MPa. It uses a G3/8 port, M20x1.5 rod thread, 36 mm cushions, and operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX55S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX55S replacement — usually within 7-8 hours.