10-Pack 634ZZ Ball Bearing 4x16x5mm - Shielded - Miniature

634ZZ Shielded Ball Bearings
✔️ 4x16x5mm Chrome Steel - Pack of 10

This 10-pack of 634ZZ miniature ball bearings is made from high-strength chrome steel for long-lasting durability and high-speed performance. Each bearing features double metal shields to keep out dust and debris, and comes pre-lubricated with grease for smooth, maintenance-free rotation - ideal for hobby gearboxes, RC cars, and small mechanical systems.

✅ Quantity: 10 Bearings
✅ Size: 4mm inner x 16mm outer x 5mm width
✅ Material: Chrome steel
✅ Type: Deep groove ball bearings
✅ Shield Type: Double metal shields (ZZ)
✅ Lubrication: Pre-lubricated with grease
✅ Dynamic Load Rating (Cr): 1,750 N
✅ Static Load Rating (Cor): 670 N
✅ Max Speed (Grease): 40,000 RPM

✅ Common Equivalents:
KOYO 634ZZ • NSK 634ZZ • NMB R-1640ZZ

💡 Where are miniature ball bearings like 634ZZ commonly used?
Miniature bearings are perfect for compact, high-speed devices such as RC vehicles, 3D printers, precision tools, and small gear assemblies - where smooth, low-friction motion is critical.

Engineered for fast, reliable motion in tight spaces - great for both performance and replacement use.