Standards & Authorities

Meaning: 
Unified Thread Standard
Meaning: 
Unified National Special

This is a thread designation. It refers to a non-typical, yet standardized thread pitch for a given diameter. UNS threads are typically finer than UNF, but coarser than UNEF.

Meaning: 
Unified National Radius
Meaning: 
Unified National Fine
Meaning: 
Unified National Extra Fine
Meaning: 
Unified National Coarse
Meaning: 
Unified National
Meaning: 
Society of Automotive Engineers

SAE publishes the AS (AeroSpace Standards).

From their Website:

Meaning: 
National Fire Protection Association
Meaning: 
Normenausschuss der deutschen Industrie (Standardisation Committee of German Industry)

From Wikipedia:

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