This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX650S, 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 SI80AX650S
The AirTAC SI80 Standard Air Cylinder SI80AX650S 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 SAI80AX650S, 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 → SAI80AX650S
- 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 SI80AX650S
The AirTAC SI80AX650S is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel, a 650 mm stroke, and a SUS420J2 stainless steel piston rod (the -A option) for corrosion resistance. It delivers a thrust of 2513 N at 0.5 MPa. AirTAC replaced this legacy unit with the SAI80AX650S, a direct replacement retaining the exact same ISO 15552 mounting interface, 80 mm bore, stroke, port size, and output force.
The SAI upgrade introduces an advanced piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The G3/8 port remains unchanged, and the original -S magnet supports legacy CS1-B/DS1-B sensors, though the SAI family accommodates current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80AX650S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX650S |
| 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 SAI80AX650S 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 SAI80AX650S 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 SI80AX650S
| 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 SI80AX650S Is Used
Long-Stroke Ejection
Ideal for pushing heavy machined parts out of CNC fixtures over a 650 mm travel distance, utilizing the 2513 N thrust at 0.5 MPa with external guide rails to prevent rod bending.
Pallet Diversion
Deploys a 650 mm stroke to shift large pallets between parallel conveyor lanes, benefiting from the SUS420J2 stainless rod in mildly corrosive washdown environments.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX650S with the SAI80AX650S
To replace the discontinued SI80AX650S, order the SAI80AX650S, ensuring a seamless ISO 15552 direct fit by verifying the 80 mm bore, 650 mm stroke, G3/8 port, M20x1.5 rod thread, and mounting accessory. When sizing, consider neighboring bores: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore provides 3927 N. Note that a plain cylinder drifts on air loss as the 36 mm adjustable cushion only decelerates near stroke end; for load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because the 650 mm stroke exceeds 300 mm, use external guides to prevent rod bending and side-load wear. The SAI family also adds the SAIF self-valve option (bores 32-100) absent in the SI line.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX650S
- ✓ 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 SI80AX650S FAQ
Yes, the SI80AX650S is discontinued. The direct replacement is the SAI80AX650S. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 650 mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
The 80 mm bore provides 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. Operating speed is 30-800 mm/s, with a 36 mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX650S
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