This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X440SN, 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 SI80X440SN
The AirTAC SI80 Standard Air Cylinder SI80X440SN 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 SAI80X440SN, 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 → SAI80X440SN
- 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 SI80X440SN
The AirTAC SI80X440SN is a discontinued double-acting ISO 15552 profile cylinder with a 440 mm stroke and NBR seals. It delivers 2513 N push force at 0.5 MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI80X440SN, a direct sharing the exact interface, bore, stroke, force and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI80 Standard Air Cylinder SI80X440SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X440SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X440SN |
| 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 SAI80X440SN 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 SAI80X440SN 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 SI80X440SN
| 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 SI80X440SN Is Used
Pallet Diversion
Actuates heavy divert arms on packaging lines, using the 440 mm stroke to push standard pallets cleanly 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 with reliable momentum damping.
Press Ejection
Ejects formed metal parts from hydraulic presses, relying on adjustable end cushions to decelerate the 80 mm bore smoothly over the long travel.
Replacing the Airtac SI80 Standard Air Cylinder SI80X440SN with the SAI80X440SN
To replace the SI80X440SN, order the SAI80X440SN to retain the ISO 15552 mounting dimensions, 80 mm bore, 440 mm stroke, M20x1.5 rod thread and G3/8 port. Keep the -S magnet for CS1-B/DS1-B sensing (the SAI uses current AirTAC switches) and the -N NBR seal. If you need more force, the 100 mm bore gives 3927 N push at 0.5 MPa; if less, the 63 mm bore offers 1559 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding. At 440 mm, use an external guide to prevent rod bending from side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X440SN
- ✓ 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 SI80X440SN FAQ
Yes, the SI80X440SN is discontinued. The direct replacement is the SAI80X440SN. It shares the identical ISO 15552 mounting interface, 80 mm bore, 440 mm stroke, output force and G3/8 port, fitting directly into existing fixtures.
The 80 mm bore operates at 30-800 mm/s. It generates 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 force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X440SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X440SN replacement — usually within 7-8 hours.