Alternative Design 1 (Rifle Bearing)

The “alternative design 1” we identified is shown in Figure 3, and is used in fluid dynamic bearing fans from Aerocool, Arctic, BitFenix, and SilenX. On this design, the inside of the bearing is smooth, and there are several grooves alongside the exterior of the bearing, where lubricant flows from one end of the bearing to the other. The number of grooves vary: we saw twelve on the Aerocool Shark 120mm Black Edition and Arctic AFACO-120P0-GBA01, ten on the Arctic AFACO-12PP0-GBA0, and nine on the BitFenix BFF-LPRO-12025R-RP and SilenX EFX-12-15. From all “alternative” fluid dynamic bearing designs, this is the most high-end. The confusion here is that this kind of bearing is also called “rifle bearing” by several companies. Companies that sell fans based on Matsushita’s design think that fans based on this alternative design should all be called “rifle bearing,” so users would be able to compare apples to apples.

rifle bearingFigure 3: Alternative design 1 – rifle bearing (Aerocool Shark 120mm Black Edition)


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.