The most common types of seals used to protect bearing arrangements in general industrial applications are radial shaft seals for shaft diameters up to 203 mm (8 in). Large diameter seals, for shaft diameters above 203 mm, have special features and are intended for use in large-size and heavy-duty applications.seal rotating shafts reliably and are used in millions of applications and a variety of equipment in general industry and the automotive sector. This radial shaft seal ring is based on know-how gained from years of experience. It continually undergoes further refinement based on the latest technological developments, and is particularly functionally reliable, flexible and extremely stressable. seals are used in applications with motion between the hardware component and the sealing solution. The motion can be rotary, translatory, reciprocating or oscillating. Effective dynamic seals need to maintain a balance between the sealing force, minimize the friction and furthermore prevent leakage.