Bearing Enduro Bearings ACB 4545 405495 Stainless Steel – 1-1/2"

ACB 4545 405495 SS 1-1/2 – 440C stainless steel angular-contact headset bearing (40.5mm x 49.5mm x 6.5mm: 45x45 deg).

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

In the bicycle industry, this bearing size is also known by the codes:
HSS 6011
ACB495H6.5

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

The Enduro range of angular-contact headset bearings starts with black-oxide-treated chromium steel races and extends to full 440C stainless steel. The bearings are engineered with the largest balls possible, feature dual-lip seals running 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 that all balls engage evenly, distributing force over a larger surface area to minimize wear and maximize service life.

Static load – 470lbf / 2.09kN
Weight – 24g