Terminology on topics related to nuts and bolts, threaded fasteners and tightening techniques:

FUNDAMENTAL TRIANGLE HEIGHT
The fundamental triangle height is normally designated with the letter H. This is the height of the thread when the profile is extended to a sharp vee form.

For 60 degree thread forms such as metric and Unified thread series, H equals 0.866025 times the thread pitch.

FUNDAMENTAL DEVIATION
An intentional clearance between internal or external thread and the design form of the thread when the thread form is on it's maximum metal condition.

For metric threads the fundamental deviation are designated by letters, capitals for internal threads and small letters for external threads.

FRICTION STABILIZERS
Coating materials used on fasteners with the intention of reducing the scatter in the thread and bearing surface friction coefficients.

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