20Pcs 693ZZ Miniature Ball Bearings 3x8x4mm High Speed Low Noise Double Shielded Deep Groove Bearings For Motors RC DIY 3D Printers And Hobby Projects Ultra Smooth Operation And Durable Heat Treated Steel Construction
✔️ 20 pcs, 3x8x4mm, ABEC-1 precision, double shields, steel
This compact set contains 20 pieces of 693ZZ miniature deep groove bearings sized 3x8x4 mm (0.118 x 0.315 x 0.157 in). The bearings are made from heat-treated high-carbon steel (HRC 50-55) for wear resistance and dimensional stability, making them ideal for compact, high-speed applications where loads are primarily cyclic rather than impact. Common uses include tiny motors, 3D printers, RC models, and precision instruments with limited space.
✅ Inner diameter 3 mm; outer diameter 8 mm; width 4 mm (3x8x4 mm, 0.118x0.315x0.157 in)✅ ABEC-1 (P0) precision with Z2-grade low-noise processing
✅ Double metal shields protect against dust while keeping friction low
✅ High-carbon steel body heat-treated to HRC 50-55 for durability
✅ Pack of 20 bearings in a reusable plastic box
✅ Ideal for tiny motors, 3D printers, RC gear, and precision instruments
💡 What is a small 3x8x4 mm deep groove bearing used for in hobby projects? A handy explanation: - High precision ABEC-1 tolerance for smooth motion - Heat-treated steel body resists wear under cyclic loads - Double shields limit dust and extend life - Great for tiny motors, 3D printers, RC gear, and precision tools