Steel Balls Enduro 3/16 (0.1875) Grade 5 Chromium Steel BK-5059, 50 pcs

Steel Balls Enduro 3/16 (0.1875) Grade 5 Chromium Steel BK-5059, 50 pcs

The Enduro BK-5059 set features high-precision loose steel balls designed for servicing and rebuilding bicycle hubs, bottom brackets, and other serviceable bearing systems. While sealed bearings are common on modern bikes, loose ball components are still widely used and essential for proper maintenance.

These 3/16 inch (0.1875) balls are manufactured from Grade 5 chromium steel, offering exceptional dimensional accuracy and roundness. Grade 5 balls meet or exceed a sphericity tolerance of 5 per 1,000,000, a level of precision so high that bearing races cannot be ground to match it.

This is the same quality level of balls used in Enduro’s ABEC-5 bearings, ensuring extremely smooth rolling, consistent load distribution, and minimal friction. These characteristics make Grade 5 balls ideal for high-performance and precision-critical applications.

Only a few years ago, Grade 25 balls were considered very high-end and were used exclusively in premium hubs and bottom brackets. Today, Enduro’s entry-level ABEC-3 bearings already feature Grade 10 balls, while higher-end and performance-focused solutions utilize Grade 5 balls as a professional standard.

• Type: Loose ball bearings
• Diameter: 3/16" (0.1875)
• Material: Chromium steel
• Grade: Grade 5
• Quantity: 50 pcs
• Application: Hubs, bottom brackets, and precision bearing systems