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GB /T 1228 - 2006

High Strength Bolts with Large Hexagon Head for Steel Structures

GB /T 1228 - 2006 钢结构用高强度大六角头螺栓

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Dimensional Specifications — GB /T 1228 - 2006 (mm)

Size	P	e	r	k_max	k_min	s_max	s_min	ds_max	ds_min	k_nominal	ds_nominal
M12	2	9.25	10.75	16.43	15.57	0.8	0.4	29.56	10	19.23	24.9
M16	2.5	13.1	14.9	22.52	21.48	0.8	0.4	39.55	14	26.32	33.3
M20	3	16.1	17.9	27.84	26.16	0.8	0.4	50.85	17	32.84	42.8
(M22)	3.5	17.65	19.75	30.84	29.16

Related Standards

GB /T 1231 (bolt) - 2024— High Strength Bolts with Large Hexagon Head Assemblies for Steel Structures GB /T 9125.1 - 2020— Hex Bolt for Pipe Flange Connection - PN Designated GB /T 9125.2 - 2020— Hex Bolt for Pipe Flange Connection - Class Designated GB /T 16939 - 2016— High Strength Bolts for Joints of Space Grid Structures GB /T 9125 - 2010— Hex Bolt for Pipe Flange Connection GB /T 9125 - 2003— Hex Bolt for Pipe Flange Connection GB /T 16939 - 1997— High Strength Bolts for Joints of Space Grid Structures GB /T 1228 - 1991— High Strength Bolts with Large Hexagon Head for Steel Structures

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