Black bearing bearing headset 40 × 51.5 × 7 mm 45° / 45° mm HB-D12

BLACKBEARING D12 headset bearing – 40 × 51.5 × 7 mm (45°/45°)

The BLACKBEARING D12 is a high-quality sealed cartridge headset bearing designed for bicycle applications. Precision manufacturing, low friction, and a reliable sealing system ensure smooth steering performance and long service life.

Key features

• High-quality BLACKBEARING headset bearing
• Sealed cartridge bearing design
• 45°/45° angular contact configuration
• Low rolling resistance
• High protection against dust, mud, and moisture
• Chrome steel races and balls
• Precision-ground contact surfaces for smooth operation
• Durable grease for extended service life
• Optimized for bicycle headset systems

Technical specifications

Compatibility

• Suitable for headset systems requiring a 40 × 51.5 × 7 mm bearing
• 45°/45° angular contact design
• Used in specific headset standards where this exact size is required
• Always verify dimensions and contact angle before installation, as headset bearings are not universally interchangeable

In practice

• Ideal replacement for worn or damaged headset bearings
• Provides smooth and precise steering feel
• The sealed construction effectively protects against dirt and moisture
• Durable construction ensures long service life
• Reliable performance for road, gravel, MTB, and e-bike use