This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX550, 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 SI80AX550
The AirTAC SI80 Standard Air Cylinder SI80AX550 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 SAI80AX550, 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 → SAI80AX550
- 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 SI80AX550
The AirTAC SI80AX550 is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 550mm stroke. It features a SUS420J2 stainless piston rod (A option) and delivers 2513 N push force at 0.5 MPa via a G3/8 port. Because this legacy SI unit is end-of-life, you should order the direct replacement: SAI80AX550. It shares the same ISO 15552 mounting interface, stroke, output force, and port size, dropping directly into existing fixtures.
The SAI80AX550 upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80AX550 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX550 |
| 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 SAI80AX550 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 SAI80AX550 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 SI80AX550
| 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 SI80AX550 Is Used
Long-Stroke Diversion
Drives large package diverters or sorting gates over a 550mm travel, utilizing the 2513 N push force at 0.5 MPa to move heavy goods reliably.
Material Lowering
Lowers stacked pallets or fixtures in a vertical press setup, where the 36mm adjustable air cushions safely decelerate the load near stroke end.
Stainless Rod Washdown
Actuates dampers or doors in humid processing zones using the SUS420J2 stainless steel rod option for enhanced corrosion resistance over standard carbon steel.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX550 with the SAI80AX550
To replace the SI80AX550, order SAI80AX550. Confirm the ISO 15552 mounting interface, the 550mm stroke, and the G3/8 port. This SKU has no magnet (-S), so it cannot accept a CS1-B/DS1-B sensor; if sensing is needed, select an SAI80X550S. Because the 550mm stroke is long, use an external guide to prevent rod bending and side-load damage. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. If sizing down, a 63mm bore gives 1559 N push at 0.5 MPa; if sizing up, a 100mm bore yields 3927 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX550
- ✓ 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 SI80AX550 FAQ
Yes, the SI80AX550 is discontinued. The direct replacement is the SAI80AX550. It is dimensionally interchangeable per ISO 15552, matching the 80mm bore, 550mm stroke, 2513 N force, G3/8 port, and mounting fixtures.
The G3/8 port bore delivers a push of 2513 N and a pull of 2268 N at 0.5 MPa. At 0.7 MPa push is 3518 N, and at 0.9 MPa it is 4523 N. The theoretical maximum force is 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX550 replacement — usually within 7-8 hours.