BS 4933:2010

Foreword
1 Scope
2 Normative references
3 Manufacture and property classes of steel bolts
   and screws
4 Mechanical properties of steel bolts and screws
5 General dimensions and tolerances
6 Length of bolts and screws
7 Ends of bolts and screws
8 Screw threads
9 Nuts
10 Finish
11 Marking and identification of bolts and screws
12 Inspection and testing
13 Complete designation for the purpose of an
   enquiry or order
Annexes
Annex A (informative) - Summary of requirements
Annex B (informative) - Formulae for basic dimensions
        of products greater than 24 mm diameter
Bibliography

Describes requirements and gives general dimensions and tolerances for the following types of cup head and countersunk head bolts and screws: - cup head bolts and screws; - cup head bolts with nibs; - cup head square neck bolts; - 90 degree countersunk head bolts and screws; - 90 degree countersunk head bolts with nibs; - 90 degree countersunk head square neck bolts; and - 120 degree countersunk head square neck bolts.

This British Standard specifies requirements and provides general dimensions and tolerances for the following types of cup head and countersunk head bolts and screws:

• cup head bolts and screws;

• cup head bolts with nibs;

• cup head square neck bolts;

• 90° countersunk head bolts and screws;

• 90° countersunk head bolts with nibs;

• 90° countersunk head square neck bolts;

• 120° countersunk head square neck bolts.

Mechanical properties for steel bolts and screws are specified in BSENISO898‑1.

This British Standard also specifies requirements for the nuts to be provided with bolts and screws conforming to this standard.

NOTE1 A table summarizing the key requirements of BS4933 is included in AnnexA. This table does not list every requirement in BS4933 but is just intended as a quick reference for users.

NOTE2 It is considered that the range of nominal sizes included in this standard is adequate for most of the applications for which this series is likely to be employed, but for the convenience of users requiring larger sizes, further information is provided in AnnexB.