This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX650, 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 SI80AX650
The AirTAC SI80 Standard Air Cylinder SI80AX650 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 650mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80AX650, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80AX650
- 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 SI80AX650
The AirTAC SI80AX650 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore and 650 mm stroke. It delivers 2513 N push and 2268 N pull at 0.5 MPa, utilizing a G3/8 port and an M20x1.5 rod thread. AirTAC replaced this legacy unit with the SAI80AX650, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI80AX650 upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SKU lacks the -S magnet suffix, it cannot accept a position switch. It uses the SUS420J2 stainless steel piston rod (-A option) for corrosion resistance.
Airtac SI80 Standard Air Cylinder SI80AX650 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX650 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX650 |
| Bore size | Ø80 mm |
| Stroke | 650 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 SAI80AX650 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 SAI80AX650 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 SI80AX650
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×650 | 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 SI80AX650 Is Used
Long-Stroke Material Transfer
Pushes heavy pallets or workpieces across a 650 mm gap using 2513 N of thrust at 0.5 MPa, requiring external guide rails to prevent rod side-loading.
Stainless Rod Washdown Gate
Utilizes the SUS420J2 stainless piston rod to operate a heavy access gate in a humid washdown environment where standard carbon steel rods would corrode.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX650 with the SAI80AX650
To replace the discontinued SI80AX650, order the SAI80AX650. Confirm the ISO 15552 mounting interface, the 650 mm stroke, the G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). Since this SKU lacks a magnet, it cannot support sensing; if switches are needed, select an SAI80X650S model and use current AirTAC sensors. For sizing, the 80 mm bore yields 2513 N push at 0.5 MPa; if less force is needed, a 63 mm bore provides 1559 N, while a 100 mm bore offers 3927 N. Note that this plain cylinder does not hold load without live air—the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve. Finally, at 650 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX650
- ✓ 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 SI80AX650 FAQ
Yes, the SI80AX650 is discontinued. The direct replacement is the SAI80AX650. It shares the identical ISO 15552 mounting interface, 80 mm bore, 650 mm stroke, output force, and G3/8 port, fitting directly into existing fixtures.
The 80 mm bore uses a G3/8 air port. It generates 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. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX650
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX650 replacement — usually within 7-8 hours.