Historical
ANSI/ASME B18.3.4M-1986 (R2002)
Screws, Hexagon Socket Button Head Cap (Metric Series)
Contains the complete general and dimensional requirements for Metric Series Hexagon Socket Button Head Cap Screws of nominal sizes from 3mm to 16mm recognized as an American National Standard. Also included are appendices covering formulas for dimensions, part numbering system and preferred sizes for government use, and thread dimensions.
American Society of Mechanical Engineers [asme]