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BS 450:1958

Current

Current

The latest, up-to-date edition.

Specification for machine screws and machine screw nuts (B.S.W. & B.S.F. threads)

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

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

Dimensions, tolerances and general requirements for sizes above and below ¼ in. Covers screws of the following types: 90 degrees countersunk and raised countersunk, round, pan, cheese and mushroom with slotted and with recessed heads. Appendices on dimensions of hexagon head screws and hexagon precision nuts in sizes below ¼ inch; flushness gauge for countersunk heads; penetration of standard gauge points for recessed heads; formulae for dimensions; tables of standard sizes.

Committee
FME/9
DevelopmentNote
Inactive for the new design. (08/2005) Also numbered as AS B50. (06/2006) Reviewed and confirmed by BSI, August 2012. (07/2012)
DocumentType
Standard
Pages
48
PublisherName
British Standards Institution
Status
Current

The provisions of this British Standard are applicable to both ferrous and non-ferrous screws and nuts having B.S.W. or B.S.F. threads. General dimensions and requirements are given for countersunk, raised countersunk, round, pan, cheese and mushroom head screws with slotted heads, and countersunk, raised countersunk, round, pan, raised cheese and mushroom head screws with recessed heads.

General dimensions for a restricted range of non-standard sizes of some of the above types of screws, together with dimensions of hexagon head screws and hexagon precision nuts in sizes below ¼ in. are given in an appendix. Other appendices relate to a suitable head flushness gauge for countersunk head screws, a method of checking recess penetration with standard gauge points, the formulae from which the dimensions are derived, and tables of standard sizes.

NOTE 1 Round head screws appeared in the 1932 edition of BS 450 and they are therefore included in this revised standard. It is considered, however, that pan head screws provide for most of the applications in which round head screws are normally used and it is recommended that they be regarded as “preferred?? since their shape enables them to offer better slot engagement. NOTE 2 Machine screw nuts, pressed type (B.A. and Whitworth form threads) are covered by BS 2827.

Standards Relationship
AS B50-1960 Identical

BS 3382-7:1966 Specification for electroplated coatings on threaded components Thicker platings for threaded components
BS 3382-3&4(1965) : 1965 SPECIFICATION FOR ELECTROPLATED COATINGS ON THREADED COMPONENTS - NICKEL OR NICKEL PLUS CHROMIUM ON STEEL COMPONENTS - NICKEL OR NICKEL PLUS CHROMIUM ON COPPER AND COPPER ALLOY (INCLUDING BRASS) COMPONENTS
BS 4183:1967 Specification for machine screws and machine screw nuts. Metric series
BS 3382-1&2(1961) : 1961 SPECIFICATION FOR ELECTROPLATED COATINGS ON THREADED COMPONENTS - CADMIUM ON STEEL COMPONENTS - ZINC ON STEEL COMPONENTS
BS 57:1951 Specification. B.A. screws bolts and nuts
BS 3382-5&6(1967) : 1967 SPECIFICATION FOR ELECTROPLATED COATINGS ON THREADED COMPONENTS - TIN ON COPPER AND COPPER ALLOY (INCLUDING BRASS) COMPONENTS - SILVER ON COPPER AND COPPER ALLOY (INCLUDING BRASS) COMPONENTS
BS 7371-12:2008 Coatings on metal fasteners Requirements for imperial fasteners
08/30173610 DC : DRAFT FEB 2008 BS 7371-12 - COATINGS ON METAL FASTENERS - PART 12: REQUIREMENTS FOR IMPERIAL FASTENERS
BS 6605:1990 Specification for cross recesses for screws
BS 5386-3:1980 Specification for gas burning appliances Domestic cooking appliances burning gas
BS 1802:1951 Specification for steel spring washers for general engineering and automobile purposes

BS 1475:1963 Specification for wrought aluminium and aluminium alloys for general engineering purposes - wire
BS 57:1951 Specification. B.A. screws bolts and nuts
BS 1473:1955 Specification for wrought aluminium and aluminium alloys for general engineering purposes - rivet, bolt & screw stock for forging.
BS 2827:1957 Specification for machine screw nuts, pressed type (B.A. and Whitworth form threads)
BS 3643(1963) : LATEST
BS 1476:1955 Wrought aluminium and aluminium alloys for general engineering purposes. Bars rods and sections
BS 4183:1967 Specification for machine screws and machine screw nuts. Metric series
BS 84:1956 Specification for parallel screw threads of Whitworth form
BS HDBK18(1972) : LATEST METRIC STANDARDS FOR ENGINEERING

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