Bearing Enduro Bearings ACB 6806 CC Bblack Oxide 1-3/8"

ACB 6806 CC BO – 1-3/8 angular-contact headset bearing with Black Oxide treatment (37mm x 49mm x 6.5mm; 36 x 45deg).

This angular-contact headset bearing has 52100 high-carbon chromium alloy races with an anti-corrosion Black Oxide/Magnetite coating, paired with grade 10 balls. The Black Oxide coating provides an additional level of corrosion resistance and helps extend service life.

This bearing size is also known in the bicycle industry by part number HD446K.

The Enduro line of angular-contact headset bearings starts with Black Oxide-treated chromium steel races and steps up to full 440C stainless steel. The Black Oxide headset bearings are treated in multiple chemical baths to achieve an anti-corrosive depth of 3 micron. This process also provides a secondary heat-treatment benefit, making the races tougher. The BO races then undergo a secondary “super grind” that polishes the rolling surface to a mirror finish. Both stainless steel and BO bearings are engineered to accommodate the largest possible balls. They feature dual-lip seals running in a micro-groove (labyrinth) and are filled 90% with extra high-pressure Almagard 3752 grease for protection against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so that all balls are evenly engaged, distributing force over a larger surface area to minimize wear and maximize service life.

• Static load – 820lbf / 3.64kN
• Weight – 25.25g