Standard Number: BS 1768-1963
Title: Specification for Unified precision hexagon bolts, screws, & nuts (UNC & UNF threads) - Normal series
Language: English
Replaced by Standard:
Replacing Standard: AB(MEE)4808 DC
Publication Date: 1963/9/17
Execute Date: 1963/9/17
Revocatory Date: 2000/1/1
Adopted International Standard:
Status: Current
Standard Type:
Publisher: British Standards
Price:
Number of Pages:50P.;A4
Preface:
Description:Dimensions, general requirements for $9D in to 2 in. Dimensions for bolts, screws, ordinary nuts, thick ordinary nuts, lock nuts, slotted nuts, thick slotted nuts. Formulae for calculation of dimensions for bolt and screw heads and nuts in intermediate or larger sizes. Applies to ferrous and non-ferrous bolts, screws, nuts and, for steel, refers to appropriate qualities up to 75 tonf/in2 minimum tensile strength. Manufacturing requirements, including decarburization and rolling laps, mechanical properties and tests for steel bolts, screws, nuts. Steels suitable for various methods of manufacture are listed; testing fixtures and recommended gauges, standard sizes of bolts and screws most likely to be stocked , shortest lengths designated as bolts, identification marking.
Overview:
Cross References:BS 18; BS 131:Part 1; BS 240:Part 1; BS 860; BS 919:Part 1; BS 969; BS 970:Part 1; BS 1574; BS 1580:Parts 1 & 2; BS 1769; BS 3111:Part 1; BS 3410
Catalog: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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