Catalog > Internet of Things (IOT) Related Products > More Platforms LM12UU Linear Bearing LM12UU Linear Bearing LM12UU Linear Bearing. ID 12mm, OD 21mm, Height 30mm Part No: HKD LINEAR BALL BEARING 12MM 25.00 ZAR inc for 1 Each (Quoting) Add to Cart Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Specifications Inner Diameter : 12Outer Diameter : 21Height : 30Thickness : 10