BS 450:1958
Current
The latest, up-to-date edition.
Specification for machine screws and machine screw nuts (B.S.W. & B.S.F. threads)
Hardcopy , PDF
English
30-06-1958
Cooperating organizations
Foreword
Specification
1. Scope
2. Material
3. Terminology
4. Dimensions
5. Heads of screws
6. Length of screws
7. Ends of screws
8. Screw threads
9. Length of thread on screws
10. Diameter of unthreaded shank on screws
Tables
1. Dimensions of header points
2. Slotted and recessed 90 deg countersunk head screws
3. Slotted and recessed 90 deg raised countersunk
head screws
4. Slotted and recessed round head screws
5. Slotted and recessed pan head screws
6. Slotted cheese head screws
7. Recessed raised cheese head screws
8. Slotted and recessed mushroom head screws
Appendices
A. Non-preferred and non-standard machine screws
and machine screw nuts
B. Flushness gauge for slotted and recessed 90 deg
countersunk head screws
C. Standard sizes of machine screws
D. Recess penetration gauging
E. Formulae for dimensions
F. Metric slot widths
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