ENDURO ACB 4545 150 BO Headset bearing – 40mm x 52mm x 7mm: 45×45 deg

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

ACB 4545 150 BO – Angular Contact 

In standard radial bearings, only three or four of the balls make contact during load. But Enduro angular contact bearings work differently. When properly installed and adjusted (black seal facing in), Enduro angular contact bearings engage all of the bearing’s balls to spread the force over a larger surface area, decreasing friction, minimizing wear and increasing bearing life.

• Deep groove design black-oxide treated 52100 high-Carbon Chromium alloy races (extra level of corrosion resistance)
• Fill with Almagard 3752 grease
• Static load: 977lbf / 4.34kN
• Weight: 24g