BS 3382-7:1966

Co-operating organizations
Foreword
Introduction
Specification
1 Scope
2 Definitions
3 Inspection
4 Screw thread dimensions
5 Plating thickness
6 Other requirements
Appendices
A Notes on surface areas of screws, bolts and nuts
B Examples of calculations of deposit thicknesses on
   plated threaded shanks
C Examples of calculating external thread dimensions
   for heavy deposits
D Thickness testing of thicker platings for threaded
   components
Tables
1 Deposit thickness multiplication factors
2 Percentage of UNF Class 2A threaded components which
   will fail to assemble when the external threads are
   plated to 0.0006 in batch average thickness
3 Total allowance by which diameters of external
   threads should be reduced from basic size to provide
   for thick deposits
Figures
1 Diagram showing increase in effective diameter as a
   result of deposit of thickness t
2 Diagram showing tolerances on screw and nut and
   clearance between them
3 Constituent surface areas of a screw or bolt

Plating thicknesses, sampling, inspection procedures, thickness determination. Does not apply to components for aircraft, self-tapping screws, wood screws.