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BS 1981 - 1991

Hexagon Head Screws

BS 1981 - 1991 六角头机械螺钉 Table 16

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Dimensional Specifications — BS 1981 - 1991 (mm)

Size	P	r	k_max	k_min	s_max	s_min	ds_max	ds_min	k_nominal	ds_nominal
2#	0.099	0.015	0.055	0.044	0.187	0.181	0.161	0.004	0.202	0.171
4#	0.164	0.024	0.11	0.096	0.25	0.244	0.224	0.008	0.272	0.234
5#	0.216	0.032	0.155	0.139	0.312	0.305	0.285	0.008	0.34	0.295
(3#)	0.125	0.019	0.07	0.058	0.187	0.181	0.161

Related Standards

GB /T 5781 - 2025— Hexagon Head Bolts - Full Thread - Product Grade C GB /T 5781 - 2016— Hexagon Head Bolts - Full Thread - Product Grade C GB /T 5783 - 2016— Hexagon Head Bolts - Full Thread GB /T 5786 - 2016— Hexagon Head Bolts with Fine Pitch Thread - Full Thread GB /T 5781 - 2000— Hexagon Head Bolts - Full Thread - Product GradeC GB /T 5783 - 2000— Hexagon Head Bolts - Full Thread - Grade A and B GB /T 5786 - 2000— Hexagon Head Bolts with Fine Pitch Thread - Full Thread GB /T 5781 - 1986— Hexagon Head Bolts - Full Thread - Product Grade C

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