BS 3382-1&2(1961) : 1961

Co-operating organizations
Foreword
Introductory notes
Specification
1 Scope
2 Definitions
3 Inspection
4 Screw thread dimensions
Part 1. Cadmium plating (bright or dull) on steel
        components
5 Resistance to corrosion
6 Purity
7 Adhesion
8 Porosity
9 Reduction of hydrogen embrittlement
10 Finish and appearance of plated surfaces
11 Plating thickness
12 Passivation
Part 2. Zinc plating (bright or dull) for steel
        components
13 Resistance to corrosion
14 Purity
15 Reduction of hydrogen embrittlement
16 Finish and appearance of plated surfaces
17 Plating thickness
18 Passivation
Appendices
A Passivation treatment
B 'Strip and weigh' method for the determination of
    group and sample average plating thicknesses
C Determination of the thickness of cadmium plating
    by the Clarke 'time of gassing' test
D Notes on surface areas of bolts screws and nuts
E Examples of calculations of deposit thicknesses on
    plated threaded shanks
Tables
1 Plating thickness
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
7 Nuts - B.S.W. and B.S.F. threads
8 Nuts - B.A. threads
9 Nuts - UNC and UNF threads
Figures
1 Probable frequency distribution of thickness in a
    barrel load
2 Curve of determination of average thickness of
    cadmium coatings
3 Constituent surface areas of a screw or bolt

Describes cadmium and zinc plating thicknesses, sampling and other inspection procedures, and methods of thickness determination for components having threads of basic major diameters from 0.060 in to 3/4 in inclusive, specified in the following, BS 84 Parallel screw threads of Whitworth form, BS 93 British Association screw threads, BS 811 Cycle threads, BS 1580 Unified screw threads, BS 2779 Fastening threads of BSP sizes, BS 3643 ISO metric screw threads. Including bolts and screws - general purpose, nuts - general purpose.