Standard

BS 1981:1991

Specification for unified machine screws and machine screw nuts

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Product Details

Descriptors

Countersunk fasteners

Square-head fasteners

Length

Cheese-head fasteners

Diameter

Recessed-head fasteners

Steels

ISO metric threads

Hexagonal-head fasteners

Threaded fasteners

Raised-head fasteners

Dimensional tolerances

Nuts

Screws (bolts)

Fasteners

Pan-head fasteners

Radius

Tensile strength

Brass

Aluminium alloys

Slotted-head fasteners

Dimensions

Unified screw threads

ICS Codes

21.060.10 Bolts, screws, studs

21.060.20 Nuts

Committee

FME/9

International relationships

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ISBN

0 580 19530 9

Publisher

BSI