20 Pieces 684ZZ Deep Groove Ball Bearings With 10 Round Shaft Rods Pro Grade Carbon Steel Build For DIY Projects 4mm Inner Diameter 9mm Outer Diameter 4mm Thick For Precision Machinery

684ZZ Deep Groove Bearings with 10 Rods - Precision Set
✔️ 4mm bore, 9mm OD, 4mm thick, 4x100mm rods included, carbon steel

This bundle pairs 20x 684ZZ deep groove ball bearings with 10x 4x100mm round rods. It's a compact kit ideal for DIY projects, small motors, micro machines, and precision machinery where reliable low-friction performance is needed.

✅ 684ZZ size bearing: bore 4mm, OD 9mm, thickness 4mm
✅ Carbon steel construction for toughness and durability
✅ Double shielded on both sides to seal lubrication
✅ Includes 10x 4x100mm round rods for easy assembly
✅ Pack contents: 20 bearings + 10 rods (30 pieces total)

💡 What is a deep groove ball bearing used for in small machinery? A handy, general explanation below.
- Handles radial and axial loads in both directions
- Suited for compact, low-friction applications
- Common in micro motors, CNC hobby gear, and office equipment