Enduro Headset Bearing BO 40x52x7mm 45°/45°

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$26.00

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SKU: SKU: HB-202500

🧡 Why Riders buy from us

Orders are packed ASAP

Most orders are packed and dispatched within an hour. Submit your order before noon PST on weekdays and it'll ship out the same day!

Genuine quality

We source all our products from reputable brands. Our bearings feature: dual lip seals, full complement MAX bearings for pivots, waterproof marine grease for superb wet weather protection and more!

Support the little guy

We work hard to make bike maintenance as easy as possible. As a small team, any show of support means a lot to us! Please tell a friend, leave a review and give us a follow on Instagram.

Professional support

Need help? Have questions? Check out our FAQs or send us a message - We respond quickly and have a boatload of bike repair and product compatibility experience!

60-day returns

We offer free exchanges and hassle free returns! Start an exchange.

✅ Compatible with

This size bearing is also known in the bike Industry by these part numbers:

HSS 6011
BAA0695K
TH-070
TH-070E
MR170
MH-P16
TH MR082

📦 What's included

1x Enduro Headset Bearing ACB 4545 150 BO - 1-1/2 (40x52x7mm -45/45deg)

ACB 4545 150 BO - 1-1/2 Black Oxide Angular Contact Headset bearing (40mm x 52mm x 7mm: 45x45 deg)

Angular-contact headset bearing featuring anti-corrosion Black oxide/Magnetite treated 52100 High-Carbon Chromium alloy races paired with grade 10 Balls. Black Oxide treatment provides an extra level of corrosion resistance and extended worry-free performance

Bearing Features:

The Black Oxide headset bearings are treated in multiple chemical baths to achieve a 3 micron anti corrosive depth. This process also provides a secondary advantage of heat treatment making them tougher. The BO races then go through a secondary "super grind” polishing the rolling surface mirror smooth.
Both Stainless and BO bearings are engineered with the largest balls possible, feature dual-lip seals riding in a micro-groove (labyrinth) and are filled 90% with extra high pressure Almagard 3752 grease for the ultimate protection against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so all balls are evenly engaged to spread the force over a larger surface area, minimizing wear and maximizing life.
Static load - 977lbf / 4.34kN
Weight - 24g

Bearing Dimensions: