Component Parts - Terminology
The figures below illustrate an assembled Ball Bearing and the terms used
to describe each component:
Retainers/Cage
The following retainers are available in most of our Ball Bearings.
●Ribbon Retainer/Cage (Symbol R)
Made from high precision strip steel, pressed and formed with spherical
ball pockets. The male and female retainer halves are caulked together.
●Crown Retainer/Cage (Symbol H)
Made from hardened high precision strip steel and pressed into a shape
form like a crown.
●Plastic Retainer/Cage (Symbol MN etc.)
Plastic retainers are offered in a range of materials, such as Nylon 6/6
with glass fiber, and has an advantage for longer life and lower acoustic
noise.
Shields and Steels (Enclosures)
●Steel Shield-Snap Ring Type
(Symbol ZZ) Refers to NMB numbering system.
The metal shield is a steel plate secured in the outer ring with a steel
snap ring.
●Steel Shield-Caulking Type
(Symbol HH or KK) Refers to NMB numbering system. (Symbol ZZ) Use to JIS numbering
system.
The shield is a formed steel plate, pressed into a recess in the outer
ring.
●Rubber Non-Contact Steel
(Symbol SS) Refers to NMB & JIS numbering system.
The rubber non-contact seal is constructed with a snap-fit into the outer
ring.
●Rubber Contact Seal
(Symbol DD) Refers to NMB & JIS numbering system.
Refers to NMB & JIS numbering systems. The rubber contact seal provides a positive contact
onto the inner ring and is a snap fit into the outer
ring.
