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Description of BS 1981:1991 1991This British Standard specifies requirements for the dimensions, tolerances and mechanical properties of machine screws and machine screw nuts having ISO inch (Unified) screw threads. Dimensions and tolerances are given for machine screws and nuts in the following diameter ranges:
Mechanical properties are specified for steel, brass and aluminium alloy machine screws and machine screw nuts. Appendices are included that relate to the dimensioning of 80° countersunk heads, slot widths and standard sizes (not to be confused with stock sizes, see note 1 to table 27).
Applicable to machine screws and machine screw nuts having ISO inch screw threads and hexagon head and slotted or recessed heads with type Z and type V recess. Mechanical properties are specified for steel, brass and aluminium alloy screws and nuts.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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