ACB Mini 276442 SS – 1-inch 440C stainless steel angular-contact headset bearing (14.2 × 25 × 6.5 mm; 45 × 45°).
The bearing has 440C stainless steel balls and races for corrosion resistance.
This bearing is also known in the bicycle industry by these part numbers:
307481
W 276442
Enduro angular-contact headset bearings are made with black-oxide-treated chromium steel races or from 440C stainless steel. They use the largest balls possible, dual-lip seals that run in a micro-groove (labyrinth), and are filled to 90% with high-pressure, waterproof grease. This construction helps protect the bearing from sweat and the elements. Enduro Angular Contact (A/C) bearings are designed to engage all balls evenly, distributing force over a larger surface area and reducing wear.
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