Enduro bearing ACB 3645 30.2mm x 41mm x 6.5mm: 36x45 deg

ACB 3645 CC BO 1-1/8" Angular Contact Black Oxide treated Headset bearing (30.2mm x 41mm x 6.5mm: 36x45 deg) -

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. All Enduro Black Oxide headset bearings carry a two-year warranty.

This size bearing is also known in the bike Industry by these part numbers:
BAA1054
P03K
TH-873E
MR-122
MR-040
IS41

The Enduro line of headset bearings consists of two basic performance levels that are a substantial step up from standard bike industry specifications. Enduro "entry-level" headset bearings feature premium materials like Black-Oxide treated races and carry a two year warranty, while our premium 440C stainless headset bearings carry a full lifetime warranty. 

All Enduro bearings are always engineered with the largest balls possible and feature dual lip labyrinth seals for maximum protection against sweat and the elements and to contain the 90% high pressure water proof grease, keeping everything running smoothly for the duration. The Angular Contact (A/C) design of Enduro headset bearings allow all balls in the bearing to engage the load, spreading the force over a larger surface area minimizing any possibility of premature wear and greatly extending bearing life.

Static load - 935lbf / 4.15kN
Weight - 19.24g