This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X440S, 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 SI80X440S
The AirTAC SI80 Standard Air Cylinder SI80X440S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 440mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X440S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke440 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X440S
- 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 SI80X440S
The AirTAC SI80X440S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. Generating 2513 N push force at 0.5 MPa through its 80 mm bore, it is replaced by the SAI80X440S. This direct upgrade maintains the exact G3/8 port, M20x1.5 rod thread, and 440 mm stroke. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family adds SAIL, SAIF, and BSAI lock variants absent in the SI line. Your SI80X440S uses CS1-B/DS1-B sensors via its magnet; the SAI uses current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80X440S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X440S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X440S |
| Bore size | Ø80 mm |
| Stroke | 440 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 SAI80X440S 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 SAI80X440S 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 SI80X440S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×440 | 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 SI80X440S Is Used
Pallet Diversion
Actuates heavy lane diverters on packaging lines, using the 440 mm stroke to push pallets firmly onto parallel conveyors.
Vertical Lift Gate
Raises and lowers mezzanine safety gates, where the 2513 N push force at 0.5 MPa handles the heavy steel frame reliably.
Press Ejection
Ejects formed metal parts from hydraulic presses, requiring the full extension and robust cushioning of this 80 mm bore cylinder.
Replacing the Airtac SI80 Standard Air Cylinder SI80X440S with the SAI80X440S
To replace the SI80X440S, order the SAI80X440S. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 440 mm stroke, 2513 N force, G3/8 port, and mounting. Retain your PT/G/NPT thread choice and mounting accessory. If you need a smaller bore, the 63 mm yields 1559 N push; for more power, the 100 mm gives 3927 N. Because the 440 mm stroke is long, use an external guide to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use the SAIL/BSAI lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X440S
- ✓ 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 SI80X440S FAQ
Yes, the SI80X440S is discontinued. The direct replacement is the SAI80X440S. It is a true ISO 15552 profile cylinder that matches the 80 mm bore, 440 mm stroke, output force, G3/8 port, and mounting interface, fitting existing fixtures perfectly.
The 80 mm bore uses a G3/8 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 max of 513 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 36 mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X440S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X440S replacement — usually within 7-8 hours.