ACB 6808 CC 1-1/2 Angular Contact Black Oxide treated Headset bearing (40mm x 52mm x 6.5mm; 36 x 45deg) –

Angular-contact headset bearing featuring anti-corrosion Black Oxide/Magnetite coated 52100 High-Carbon Chromium alloy races paired with grade 10 Balls. Black Oxide coating provides an extra level of corrosion resistance and extended worry-free performance.

This size bearing is also known in the bike Industry by these part numbers:
HD 1404K
BAA0006K
MR-127
MR-196
MH-P25K
BAA1132
TH MR019

The Enduro line of angular-contact headset bearings start with Black Oxide treated Chromium steel races, steps up to full 440C stainless steel, and the top of the lines, lifetime-guaranteed, XD-15 aerospace-stainless (races and balls). They are always engineered with the largest balls possible, feature dual-lip seals riding in a micro-groove (labyrinth) and are filled 90% with high pressure water proof grease for the ultimate protection against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so all balls are evenly engaged to spread the force over a larger surface area, decreasing friction, minimizing wear and maximizing life.

Static load – 917lbf / 4.08kN
Weight – 24.9g