DBH radial shaft seals: replacement by size d, D and h
A radial shaft seal (also called an oil seal) keeps the grease or oil in a bearing from escaping out of the housing, and keeps dirt, water or dust from entering from outside into the bearing. It is a small, inexpensive part compared with what it protects, but a poorly chosen or worn seal is one of the most common causes of a bearing washing out and failing prematurely.



























