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Races and ball bearings are 440C stainless steel for superior anti-corrosion qualities.
Measures: 37mm ID x 48.9 (49mm) OD x 6.5mm W
This bearing is also known as: HD446K, Trek W513538
Among other applications, this bearing is used on Trek Emonda late models (upper headset bearing) and Cervelo P5 2023 (lower headset bearing).
440C stainless steel balls and races provide long life and superior corrosion resistance in applications and environments that may be less than ideal. 440C has the highest strength, hardness, and wear resistance of all the standard 440-series stainless alloys with high carbon content. Superior sealing system ("Split Lip") and marine duty grease offer great corrosion resistance.
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