Enduro Sealed Angular Contact Headset Bearing 4545 125T SS 1 1/8" - 34.1 x 46 x 7mm (45 x 45 deg)

ACB 4545 125T SS - 1 1/8" 440C Stainless Steel Angular Contact Headset Bearing - 34.1 x 46 x 7mm (45 x 45 deg)

Not all types of stainless steel possess the same quality standards.

Enduro exclusively opts for 440C stainless steel balls and races, ensuring extended durability and superior resistance to corrosion in challenging operational and environmental conditions. Within the range of standard 440-series stainless alloys boasting high carbon content, 440C stands out for its exceptional strength, hardness, and wear resistance. This particular alloy, being the costliest among the 440 series, necessitates multiple cycles of heat treatment and cryogenic procedures to achieve its superior mechanical properties. While stainless steel exhibits a 20% lower load capacity and slightly softer characteristics compared to our standard 52100 chromium steel, widely used in most of our bearings, it remains an excellent choice for use in wet environments, frequent bike washes, or areas prone to perspiration. Moreover, Enduro Bearings employ LLB-type seals and CRC Marine Grease in these bearings to further waterproof them against environmental elements. The Enduro 440C stainless headset bearings are identical to those found in numerous renowned headset brands offering an impressive 110-year warranty.

The Enduro lineup of angular-contact headset bearings begins with Black Oxide treated Chromium Steel races, progresses to full 440C stainless steel, and culminates in the top-tier XD-15 aerospace-stainless (both races and balls) backed by a lifetime guarantee. These bearings are consistently engineered to accommodate the largest possible balls, feature dual-lip seals riding within a micro-groove (labyrinth), and are filled to a 90% capacity with high-pressure waterproof grease, ensuring unparalleled protection against perspiration and environmental elements. Enduro Angular Contact (A/C) bearings are intricately designed to engage all balls, effectively distributing force over a larger surface area, thereby reducing friction, minimizing wear, and maximizing the bearings' lifespan.