BSI - BS 1769
Unified Black Hexagon Bolts, Screws, Nuts (UNC & UNF Threads) Heavy Series
|Publication Date:||24 September 1951|
|ICS Code (Bolts, screws, studs):||21.060.10|
|ICS Code (Nuts):||21.060.20|
Dimensions, general requirements for sizes 1⁄2 in to 2 in. Dimensions of bolts, screws, ordinary nuts, lock nuts, slotted nuts, bolts faced under the head and machined on shank, machined nuts. Formulae for calculation of dimensions for bolts, screw heads, nuts in intermediate sizes, and sizes larger than 2 in.