Seals

The primary purpose of a seal is to protect the critical internal working elements from contaminants, keeping the lubricant clean and inside the bearing. Seals are available in a variety of types and compositions, the most common being synthetic (Nitrile^® or Buna^®) rubber molded to a steel plate.

The seal snaps into a small groove on the under side of the outer ring’s inside diameter. The rubber portion of the seal that contacts the inner ring is molded into a specially designed lip configuration.

NTN bearing inserts are offered with a variety of seal options, each designed to protect the bearing from contaminants in an equally wide variety of applications. The following seals are normally used in NTN standard units:

• Single lip contour riding seal (AS)
• Single lip contour riding seal with trash guard (AELS)
• Single lip land riding seal with trash guard with secondary lip (AR)
• Single lip land riding seal with flinger (UK)
• Triple lip land riding seal with trash guard (LLS)
• Bearing Units with Dust Covers