BS 2903:1980

Foreword
Cooperating organizations
Specification
1 Scope
2 Rating
3 Types of hook
4 Special hooks
5 Material
6 Hardness test
7 Destruction test
8 Form and dimensions
9 Tolerances on forged dimensions
10 Diameter and length of shank (types 1, 2 and 5)
11 Screw threads and undercut
12 Workmanship
13 Heat treatment
14 Quality marking
15 Proof loading
16 Testing facilities
17 Additional tests
18 Inspection
19 Identification marking
20 Manufacturer's certificate
Appendices
A Notes on design
B Information to be supplied with the enquiry or order
C Particulars of screw threads
D Selection of ball or roller thrust bearings
E Optional lugs for attachment of safety catches on
    point hooks
F Optional 'flats' for attachment of safety catches on
    'C' hooks
G Safe working loads of chain assemblies (Grade M
    chains)
Tables
1 Point hook with shank
2 Point hook with shank (having increased internal
    diameter for small loads)
3 Point hook with eye (for use with chain)
4 Point hook with eye (for use with wire rope
    thimbles)
5 'C' hook with shank
6 'C' hookwith eye (for use with chain)
6A Link combined with 'C' hook, table 6 (for use with
    wire rope thimbles)
7 Values of K
8 Approximate mass of drop forged trapezoidal section
    hooks
Figures
1 Dimensions of undercut
2 Point hook, showing points 'a' and 'b' and
    recommended positions for marking
3 'C' hook, showing points 'a' and 'b' and recommended
    positions for marking
4 Optional lugs (point hooks)
5 Optional 'flats' ('C' hooks)