This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X40SN, 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 SI80X40SN
The AirTAC SI80 Standard Air Cylinder SI80X40SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X40SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X40SN
- 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 SI80X40SN
The AirTAC SI80X40SN is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminium barrel, delivering 2513 N push force at 0.5 MPa through its 80 mm bore. AirTAC replaced this end-of-life unit with the SAI80X40SN direct replacement, retaining the exact interface, 40 mm stroke, 25 mm rod, G3/8 port and M20x1.5 thread. The -S denotes a piston magnet for CS1-B/DS1-B sensors, and -N specifies NBR seals operating between -20 and +70 C.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For high heat, Viton H seals are available. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80X40SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X40SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X40SN |
| Bore size | Ø80 mm |
| Stroke | 40 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 SAI80X40SN 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 SAI80X40SN 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 SI80X40SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×40 | 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 SI80X40SN Is Used
Clamp Actuation
Provides 2513 N of push force at 0.5 MPa, ideal for securing heavy cast metal parts during CNC milling or drilling operations.
Package Diversion
Short 40 mm stroke rapidly actuates diverting arms on high-speed packaging lines to route boxes efficiently.
Pallet Stopping
Functions as a robust pneumatic stop gate for heavy loaded pallets, utilizing its 513 kgf maximum theoretical force capacity.
Replacing the Airtac SI80 Standard Air Cylinder SI80X40SN with the SAI80X40SN
To replace the SI80X40SN, order the SAI80X40SN. It is dimensionally interchangeable per ISO 15552 mounting dimensions, dropping straight into existing fixtures without modifications. Confirm your port thread (PT/G/NPT) and mounting accessory (LB, FA, TC, etc.). The built-in magnet (-S) works with legacy CS1-B/DS1-B switches, though the SAI replacement uses current AirTAC sensors. 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. Note that a plain cylinder drifts on air loss as the cushion only decelerates—for held loads use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X40SN
- ✓ 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 SI80X40SN FAQ
Yes, the SI80X40SN is discontinued. The direct replacement is the SAI80X40SN. It shares the exact ISO 15552 mounting interface, 80 mm bore, 40 mm stroke, output force, G3/8 port and accessories, fitting existing fixtures perfectly.
The bore features 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X40SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X40SN replacement — usually within 7-8 hours.