Bearing Enduro Bearings ACB 3645 CC Black Oxide 1-1/8"

ACB 3645 CC BO 1-1/8 angular-contact headset bearing with a Black Oxide coating. Dimensions: 30.2 × 41 × 6.5 mm; contact angle: 36 × 45°.

• Angular-contact bearing with anti-corrosion Black Oxide / Magnetite-coated 52100 high-carbon chromium alloy races and Grade 10 balls.
• The Black Oxide coating provides additional corrosion resistance.
• This bearing size is also known in the bicycle industry by the following part numbers: 27287-1046-004, HSS0130K, TH-873E, MR-122.

The Enduro angular-contact headset bearing line includes Black Oxide-treated chromium steel races, as well as bearings with full 440C stainless steel races. Black Oxide bearings are treated in multiple chemical baths to achieve a 3-micron anti-corrosion depth. This process also heat-treats the races, making them tougher. The rolling surface is then polished in a secondary “super grind” process to a mirror finish.

Both stainless steel and Black Oxide bearings are engineered to use the largest balls possible. They feature dual-lip seals running in a micro-groove (labyrinth) and are filled to 90% capacity with extra-high-pressure Almagard 3752 grease to protect against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so that all balls are evenly engaged, spreading the force over a larger surface area to minimize wear and maximize bearing life.

• Static load: 935 lbf / 4.15 kN
• Weight: 19.24 g