BS 1768:1963
Current
The latest, up-to-date edition.
Specification for Unified precision hexagon bolts, screws, & nuts (UNC & UNF threads). Normal series
Hardcopy , PDF
English
17-09-1963
Co-operating organizations
Foreword
1 Scope
2 Material and manufacture
3 Finish
4 Mechanical properties of steel bolts and screws
5 Tensile strength and proof stress of bolts and
screws
6 Grading and mechanical properties of steel nuts
7 Proof load for nuts
8 Dimensions
9 Length of bolts and screws
10 Ends of bolts and screws
11 Screw threads
12 Length of thread
13 Nuts, squareness of thread to face
14 Chamfering, washer facing and countersinking
15 Split-pin holes and slots
16 Marking
17 Inspection and testing
Appendix A - Mechanical properties of finished steel
hexagon head bolts and screws and hexagon
nuts
Appendix B - Materials
Appendix C - Testing fixtures and recommended gauges
Appendix D - Standard sizes of Unified precision steel
hexagon head bolts and screws and shortest
lengths designated as bolts
Appendix E - Details of identification marking for
Unified hexagon bolts, screws and nuts
Appendix F - Formulae
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