BS 3382-5&6(1967) : 1967

Co-operating organizations
Foreword
Introductory notes
Specification
1 Scope
2 Definitions
3 Inspection
4 Screw thread dimensions
Part 5. Tin on copper and copper alloy (including brass)
        components
5 Resistance to corrosion
6 Adhesion
7 Plating thickness
8 Visual inspection
Part 6. Silver on copper and copper alloy (including
        brass) components
9 Pre-treatment
10 Adhesion
11 Plating thickness
12 Post-plating treatments
13 Finish and appearance of plated surfaces
Appendices
D Notes on surface areas of screws, bolts and nuts
H Strip and weigh method for the determination of
    group and sample average plating thickness of tin
J Examples of calculations of deposit thicknesses of
    tin on plated components
K Strip and weigh method for the determination of
    group and sample average plating thickness of silver
L Examples of calculation of deposit thicknesses of
    silver on plated threaded shanks
M Post-plating treatment of silver deposits
Tables
1 Plating thickness (inch dimensions)
1A Plating thickness (millimetre dimensions)
2 Screws and bolts: B.S.W. and B.S.F. threads
3 Screws and bolts: UNC and UNF threads
4 Screws and bolts: B.A. threads
5 Screws and bolts: B.S.C. and B.S.P. threads
6 Screws and bolts: ISO metric threads to BS 3643
    (metric dimensions)
7 Nuts: B.S.W. and B.S.F. threads
8 Nuts: B.A. threads
9 Nuts: UNC and UNF threads
10 Nuts: ISO metric threads
Figures
1 Probable frequency distribution of thickness in a
    barrel load
3 Constituent surface areas of a screw or bolt

Specifies the coating of substantially pure tin and gives tin and silver plating thicknesses, sampling and other inspection procedures, methods of thickness determination for components having threads of basic major diameters from 0.060 in to 3/4 in inclusive, as specified in the following, BS 84 Parallel screw threads of Whitworth form, BS 93 British Association screw threads with tolerances for size 0 B.A. to 16 B.A., BS 811 Cycle threads, BS 1580 Unified screw threads, BS 2779 Fastening threads of B.S.P. sizes, BS 3634 ISO metric screw threads. Including general purpose bolts, screws and nuts.