Bearing Enduro Bearings ACB 4545 150 ABEC 3 Stainless Steel

ACB 4545 150 SS - 1-1/2 440C stainless steel angular-contact headset bearing (40mm x 52mm x 7mm: 45x45 deg).

Angular-contact headset bearing with 440C stainless steel balls and races for increased corrosion protection.

Bearings of this size are also known in the bike industry by these part numbers:
HSS011
BAA0695K
TH-070
MR-128
MH-P16

Not all stainless steel is the same. Enduro uses only 440C stainless steel balls and races to provide long service life and high corrosion resistance in demanding conditions. 440C has the highest strength, hardness, and wear resistance of all standard 440-series stainless alloys with high carbon content. As expected, it is also the most expensive of the 440 series alloys and requires special heat treatment and cryogenic treatment to achieve its superior mechanical properties. Although it is slightly softer than the standard 52100 chromium steel used in most of our bearings, stainless steel is an excellent alternative for use in wet conditions or where sweat and spilled sports drinks can be a problem. Enduro Bearings also uses LLB-type seals and Almagard 3752 grease in these bearings to provide additional protection against water and the elements. Enduro 440C stainless headset bearings are the same bearings found in many popular headset brands and come with a lifetime warranty.

The Enduro line of angular-contact headset bearings starts with Black Oxide-treated chromium steel races and includes bearings made entirely from 440C stainless steel. They are engineered with the largest balls possible, feature dual-lip seals riding in a micro-groove (labyrinth), and are filled 90% with high-pressure waterproof grease to protect against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so all balls are evenly engaged. This spreads the force over a larger surface area, minimizing wear and maximizing bearing life.

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