Enduro Sealed Angular Contact Headset Bearing 4545 405495 SS - 1 1/2" - 40.5 x 49.5 x 6.5mm (45 x 45 deg)

$53.95
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ACB 4545 405495 SS - 1 1/2" 440C Stainless Steel Angular Contact Headset Bearing - 40.5 x 49.5 x 6.5mm (45 x 45 deg)

Not every stainless steel is equal in quality. Enduro exclusively opts for 440C stainless steel balls and races to ensure prolonged durability and superior resistance against corrosion in applications and environments that might not be optimal. Among the standard 440-series stainless alloys with high carbon content, 440C stands out for its exceptional strength, hardness, and wear resistance. As anticipated, it stands as the most costly among the 440 series alloys and necessitates multiple rounds of heat treatment and cryogenic processes to achieve its superior mechanical properties. Despite having a 20% lower load capacity and being slightly softer compared to our standard 52100 chromium steel predominantly used in our bearings, stainless steel remains an outstanding choice, especially in damp conditions, frequent bike washes, or situations where sweat may be a factor. To further protect against the elements, Enduro Bearings incorporates LLB-type seals and CRC Marine grease in these bearings. The Enduro 440C stainless headset bearings are identical to those found in numerous well-known headset brands, some of which offer an extensive 110-year warranty.

The Enduro line of angular-contact headset bearings initiates with Black Oxide treated Chromium Steel races, advances to full 440C stainless steel, and culminates in the top-tier, lifetime-guaranteed XD-15 aerospace-stainless (consisting of both races and balls). These bearings are consistently engineered to accommodate the largest possible balls and feature dual-lip seals travelling within a micro-groove (labyrinth). They are filled to a 90% capacity with high-pressure waterproof grease, providing optimal safeguarding against sweat and external elements. The design of Enduro Angular Contact (A/C) bearings ensures even engagement of all balls, distributing force across a larger surface area, thereby reducing wear and extending their operational life.

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