Four Pack LMK12UU Square Flange Linear Ball Bearings 12mm ID, 21mm OD, 30mm Length With Double Seals For 3D Printers, CNC Gear And Precision Equipment, Smooth Quiet Linear Motion Bushing For Reliable Shaft Support

Four-Pack LMK12UU Square Flange Linear Bearings 12mm ID
✔️ 12mm bore, 21mm OD, 30mm long with double seals and flange 32mm

These LMK12UU square flange linear bearings provide smooth, quiet shaft support for 12mm diameter shafts. They’re a solid choice for 3D printers, CNC machines, and precision linear modules where reliable, low-friction motion matters.

✅ ID 12mm (0.472 in), OD 21mm (0.827 in), length 30mm (1.181 in) with flange edge 32mm (1.26 in)
✅ Thrust capacity: dynamic Cr 431N, static Cor 784N for solid shaft support
✅ Double seals on both sides resist dust and moisture, extended life
✅ 4-row steel balls provide smooth, low-friction motion on 12mm shafts
✅ Material: high-hardness bearing steel with high-frequency quenching for durability

💡 What is a pillow block bearing used for in precision linear motion systems?

These handy bearings support rotating shafts and help maintain alignment in automated equipment.

- What applications benefit from pillow block bearings in hobbyist and light industrial gear? 3D printers, CNCs, and linear slides - Why are seals important for long life in dusty or humid environments? They keep lubrication in and contaminants out - How easy is installation with 12 mm bore square flange units? Generally straightforward with correct mounting and preload