This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX25, 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 SI80AX25
The AirTAC SI80 Standard Air Cylinder SI80AX25 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 SAI80AX25, 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 → SAI80AX25
- 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 SI80AX25
The AirTAC SI80AX25 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore and 25 mm stroke. It delivers 2513 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI80AX25, matching the interface, bore, stroke, force and mounting. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This SI80AX25 variant uses a SUS420J2 stainless steel rod (option A) for corrosion resistance, and because it lacks a -S magnet, it cannot accept legacy CS1-B/DS1-B sensors.
The SAI family also introduces SAIL, SAIF and BSAI variants that the original SI line lacked. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end, so use a rod lock or pilot check valve for load holding.
Airtac SI80 Standard Air Cylinder SI80AX25 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX25 |
| 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 SAI80AX25 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 SAI80AX25 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 SI80AX25
| 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 SI80AX25 Is Used
Short-Stroke Clamping
Ideal for high-force 25 mm clamping tasks in machining fixtures where the SUS420J2 stainless rod resists shop-floor coolant corrosion.
Divertor Gate Actuation
Provides robust 2513 N push force to snap heavy conveyor sorting gates into position rapidly without occupying excessive longitudinal space.
Light Pressing Operations
Delivers reliable downward thrust for pressing small bearings or pins, safely operating within the 1508 N working load limit.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX25 with the SAI80AX25
To replace the discontinued SI80AX25, order the SAI80AX25. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the exact 80 mm bore, 25 mm stroke, G3/8 port, M20x1.5 rod thread and 36 mm cushions. Because this SKU lacks a magnet, it cannot support position sensing; if sensing is needed, select an SAI equivalent with a magnet and current AirTAC switches. If sizing down, a 63 mm bore yields 1559 N push at 0.5 MPa; if sizing up, a 100 mm bore yields 3927 N. For load holding on power loss, do not rely on the cushion—specify an external pilot check valve, or choose the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX25
- ✓ 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 SI80AX25 FAQ
Yes, the SI80AX25 is discontinued. The direct replacement is the SAI80AX25. It features the same ISO 15552 mounting interface, 80 mm bore, 25 mm stroke, 2513 N output force, G3/8 port and mounting accessories, fitting directly into existing fixtures.
The 80 mm bore uses a G3/8 air port. At 0.5 MPa it provides 2513 N push and 2268 N pull force. At 0.7 MPa push is 3518 N, and at 0.9 MPa push is 4523 N. The theoretical maximum force is 513 kgf at 1.0 MPa.
Request a Quote for the SAI80AX25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX25 replacement — usually within 7-8 hours.