This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX25S, 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 SI80AX25S
The AirTAC SI80 Standard Air Cylinder SI80AX25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80AX25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80AX25S
- 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 SI80AX25S
The AirTAC SI80AX25S 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, 25 mm stroke unit features a SUS420J2 stainless steel piston rod and a built-in magnet for legacy CS1-B/DS1-B sensors. AirTAC replaced it with the SAI80AX25S, a direct sharing the same G3/8 port, M20x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade retains all ratings but introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80AX25S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX25S |
| Bore size | Ø80 mm |
| Stroke | 25 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 SAI80AX25S 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 SAI80AX25S 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 SI80AX25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×25 | 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 SI80AX25S Is Used
Stainless Rod Clamping
Uses the SUS420J2 rod for moisture resistance when actuating grippers or clamping machined parts in humid machining centers.
Short-Stroke Diverter
Provides robust 2513 N push force at 0.5 MPa for rapidly sorting or diverting heavy packages on a production line.
Pallet Stop Gate
Functions as a high-force stop gate in material handling, safely halting loaded pallets using adjustable air cushions.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX25S with the SAI80AX25S
To replace the SI80AX25S, order the SAI80AX25S. Verify the ISO 15552 mounting interface, 80 mm bore, 25 mm stroke, G3/8 port (PT/G/NPT thread), and the -S magnet for current AirTAC switches. If downsizing, the 63 mm bore yields 1559 N push at 0.5 MPa; if upsizing, the 100 mm bore provides 3927 N. Remember 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. The -A rod is SUS420J2 stainless steel; Viton H seals raise heat to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX25S
- ✓ 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 SI80AX25S FAQ
Yes, the SI80AX25S is discontinued. The direct replacement is the SAI80AX25S. It shares the same ISO 15552 mounting interface, 80 mm bore, 25 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The bore is 80 mm with a G3/8 air port. Force ratings are: push 2513 N and pull 2268 N at 0.5 MPa, push 3518 N at 0.7 MPa, push 4523 N at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX25S replacement — usually within 7-8 hours.