Specifies the dimensions for bolts and screws with British Standard Whitworth threads in diameters from ¼ in to 6 in, and the material requirements for steel bolts, screws and nuts for general use.
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 REFERENCED DOCUMENTS
1.3 DEFINITIONS
1.4 MARKING
1.5 DESIGNATION
2 BOLTS AND SCREWS
2.1 SCOPE OF SECTION
2.2 METHOD OF MANUFACTURE
2.3 SHAPE, DIMENSIONS AND FINISH
2.3.1 General
2.3.2 Tolerance on length of hexagon bolts and screws
2.3.3 Ends of hexagon bolts and screws
2.3.4 Screw threads
2.3.4.1 General
2.3.4.2 Tolerances
2.3.4.3 Thread length
2.3.5 Squareness, concentricity and symmetry of hexagon bolts and screws
2.3.5.1 Squareness of head
2.3.5.2 Concentricity of shank to screw thread
2.3.5.3 Symmetry of head to shank
2.3.6 Heads of hexagon bolts and screws
2.3.7 Shank
2.3.7.1 Diameter
2.3.7.2 Bolts with split pin holes
2.3.7.3 Underhead fillet
2.3.7.4 Straightness
2.3.8 Finish
2.3.8.1 General
2.3.8.2 Normal finish
2.2.8.3 Other finishes
2.4 MATERIALS AND MECHANICAL PROPERTIES OF STEEL BOLTS AND SCREWS
2.4.1 Material
2.4.2 Mechanical properties
2.5 TESTING OF MECHANICAL PROPERTIES OF STEEL HEXAGON BOLTS AND SCREWS
3 HEXAGON NUTS
3.1 SCOPE OF SECTION
3.2 METHOD OF MANUFACTURE
3.3 SHAPE AND DIMENSIONS
3.3.1 General
3.3.2 Screw threads
3.3.2.1 Form
3.3.2.2 Tolerances
3.3.3 Chamfering
3.3.4 Countersinking
3.4 SQUARENESS OF THREADS TO BEARING FACE(S)
3.5 FINISH
3.5.1 General
3.5.2 Normal finish
3.5.3 Other finishes
3.6 MATERIALS AND MECHANICAL PROPERTIES OF STEEL NUTS
