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Glossary D


Glossary D

Deformation:
A stress induced change of form or shape.

Diameter:
Assembled Spring Inside-The inner diameter of the garter spring with the ends securely joined.

Diameter:
Free-Lip-See Diameter, Seal Unsprung Lip.

Diameter, Functional Lip:
The apparent inner diameter of the seal lip when the seal case is concentric with the outer diameter of the sizing mandrel in an air gauge, light box or similar inspection equipment.

Diameter, Inside Face Inner:
The inner diameter of the inner case of a radial lip seal.

Diameter, Lip:
The inner diameter of the seal lip, measured with the spring installed.

Diameter, Lip-Inner:
See Diameter, Seal Lip.

Diameter, Molded Lip:
The lip diameter in the free state (no spring) developed by the molding operation of the sealing element to form the contact line.

Diameter, Outer Case Inner:
The inside, or smallest, diameter of the outer case on a lip-seal assembly.

Diameter, Seal Outer:
The external diameter of a lip-seal assembly, which normally corresponds to the outer diameter of the outer seal case.

Diameter, Spring Mean Coil:
The spring coil diameter minus the spring wire diameter.

Diameter, Spring Outside Coil:
The outer diameter of an individual helical coil of a garter spring.

Diameter, Trimmed Lip:
The lip diameter in the free state (no spring) developed by knife trimming the molded portion of the sealing element to form the contact line.

Diameter, Unsprung Lip:
The inner diameter of the seal lip, measured without the spring installed.

Dimension, Radial Wall:
The distance between the seal lip contact line and the seal outside diameter measured in a radial direction on a finished seal in the free state.

Dry Running:
Operation of a seal without lubrication at the seal-shaft interface.

Durometer:
An instrument which measures the hardness of rubber by the penetration (without puncturing) of an indentor point into the surface of rubber.

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