This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X425STC, 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 SI80X425STC
The AirTAC SI80 Standard Air Cylinder SI80X425STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 425mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X425STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke425 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X425STC
- 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 SI80X425STC
The AirTAC SI80X425STC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore, 425 mm stroke, G3/8 port and TC trunnion mount. Delivering 2513 N push force at 0.5 MPa, it is replaced by the SAI80X425STC. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI80 Standard Air Cylinder SI80X425STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X425STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X425STC |
| Bore size | Ø80 mm |
| Stroke | 425 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 SAI80X425STC 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 SAI80X425STC 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 SI80X425STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×425 | 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 SI80X425STC Is Used
Pallet Diversion
Actuates heavy lane diverters on packaging lines, using the 425 mm stroke to push standard pallets cleanly onto adjacent conveyor tracks.
Vertical Lift Gate
Raises and lowers mezzanine safety gates, where the 80 mm bore provides the lift force needed to counterbalance heavy steel mesh panels.
Press Ejection
Ejects formed metal parts from hydraulic presses, relying on adjustable end cushions to decelerate the payload smoothly over the long stroke.
Replacing the Airtac SI80 Standard Air Cylinder SI80X425STC with the SAI80X425STC
To replace the SI80X425STC, order the SAI80X425STC. Verify the ISO 15552 TC trunnion mount, 425 mm stroke, G3/8 port and -S magnet. It provides 2513 N push at 0.5 MPa; sizing down, a 63 mm bore gives 1559 N, while an 100 mm bore yields 3927 N. The cushion only decelerates; it does not hold load on air loss, so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant. At 425 mm, prevent rod bending by guiding the load externally. The SAI uses current AirTAC switches for the magnet.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X425STC
- ✓ 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 SI80X425STC FAQ
Yes, the SI80X425STC is discontinued. The direct replacement is the SAI80X425STC. It shares the same ISO 15552 mounting interface, 80 mm bore, 425 mm stroke, output force, G3/8 port and TC trunnion mount, so it fits existing fixtures directly.
It has a G3/8 air port. Force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X425STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X425STC replacement — usually within 7-8 hours.