4 Pcs LM4UU Linear Ball Bearings 4mm Bore 8mm OD 12mm Length With Double Side Rubber Seal For CNC And 3D Printer Motion Systems Ideal Upgrade For DIY CNC Router Laser Engraver And Automation Projects

Pack of 4 LM4UU Sealed Ball Bearings for CNC & 3D Printers
✔️ 4x LM4UU: 4mm bore, 8mm OD, 12mm length; double seal

These LM4UU linear ball bearings are sealed on both sides to protect against dust and deliver smooth, precise motion in compact motion systems. Ideal for DIY CNC routers, laser engravers, and 3D printers that need reliable linear guidance.

✅ Bore diameter 4 mm; OD 8 mm; Length 12 mm
✅ Pack of 4 bearings
✅ Bearing steel construction; static load rating 127/C0 N; dynamic load rating 88/CN
✅ Double side rubber seal for dirt protection and long life

💡 What is a handy use for sealed ball bearings in small machines?

These handy parts are used to add smooth, precise motion to compact CNC and 3D printer setups. - Handy for shaft alignment on DIY CNC routers and 3D printers - Improves motion quality by reducing friction in linear slide unit systems - Works with 4 mm bore components for tight, compact designs - Supports easy upgrades and reliable maintenance ✝️