ACB 3645 5062 SS - 440c Stainless (Angular Contact) - 50x62x8 (36x45°)

ACB 3645 5062 SS - 1.8 inch 440C Stainless Steel Angular Contact Headset Bearing

Upgrade your bike with the ACB 3645 5062 SS angular contact headset bearing, featuring 440C stainless steel balls and races for exceptional corrosion resistance and durability. This oversized bearing (50mm x 62mm x 8mm, 36° x 45°) is also known as TH MR229 and is used in high-performance bikes like the Giant Reign e+ series. 440C stainless steel offers the highest strength, hardness, and wear resistance among standard 440-series alloys, making it ideal for demanding cycling conditions. Although stainless steel has about 20% less load capacity and is slightly softer than standard chromium steel (52100), it excels in wet environments, frequent washing, or where sweat is an issue. Enduro Bearings enhance these bearings with LLB seals and CRC Marine grease for added water resistance. These bearings are comparable to those used in premium headset brands, backed by a limited lifetime warranty. The Enduro line offers two performance levels: the entry-level with Black-Oxide races and a two-year warranty, and the premium 440C stainless steel bearings with a full lifetime warranty. Designed with large balls and dual-lip labyrinth seals, they provide maximum protection against elements and sweat, ensuring smooth operation for years. The Angular Contact (A/C) design distributes load evenly across all balls, reducing wear and extending bearing life. Static load: 935 lbf / 4.15 kN | Weight: 20g