BS 856:1969

This standard BS 856:1969 Specification for wing nuts is classified in these ICS categories:

• 21.060.20 Nuts

1.1 This British Standard specifies requirements for wing nuts having ISO metric, ISO inch (Unified), BSW¹⁾, BSF¹⁾ and BA¹⁾ screw threads.

1.2 Nominal dimensions for two forms of wing nut blank geometry are specified in the following size ranges:

Wing nut			Diameter range
Blank geometry shown in	Type designation	Product description	ISO metric	UNC UNF	BSWaBSFa	BAa
Table 1	HS	Hot stamped	M3 to M18	No. 3 to ¾ in	(⅛ in to ¾ in	5 BA to 0 BA
	DC	Cast
Table 2	CF	Cold forged	M3 to M20

^a BSW, BSF and BA screw threads have been rendered obsolescent. See Appendix A.

ISO metric, ISO inch (Unified), BSW, BSF and BA screw threads diameters 3 mm (⅛ in) to 20 mm (¾ in). Two forms of wing nut blank geometry; tables of dimensions for hot stamped and cast varieties and for cold forged products.