Bearing Enduro Bearings ACB 4545 150 Black Oxide 1-1/2"

ACB 4545 150 BO - 1-1/2 Black Oxide Angular Contact Headset bearing (40mm x 52mm x 7mm: 45x45 deg).

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 adds corrosion resistance.

This bearing size is also known in the bicycle industry by these part numbers:
HSS 6011
BAA0695K
TH-070
MR-128
MH-P16
TH MR082

The Enduro line of angular-contact headset bearings includes Black Oxide-treated chromium steel races and bearings with full 440C stainless steel races. Black Oxide 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” to polish the rolling surface to a mirror-smooth finish. Both stainless steel and BO bearings are engineered with the largest balls possible, 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, spreading the force over a larger surface area to minimize wear and maximize service life.

Static load - 977lbf / 4.34kN
Weight - 24g