AI Search

GB /T 1228 - 1991

High Strength Bolts with Large Hexagon Head for Steel Structures

GB /T 1228 - 1991 钢结构用高强度大六角头螺栓

See all versions and complete specifications: High Strength Bolts with Large Hexagon Head for Steel Structures — Full Specification Page

Dimensional Specifications — GB /T 1228 - 1991 (mm)

Size	P	k_max	k_min	s_max	s_min	ds_max	k_nominal	ds_nominal
M12	2	10.75	9.25	16.43	15.57	26.16	10	27
M16	2.5	14.9	13.1	22.52	21.48	35	14	36
M20	3	17.9	16.1	27.84	26.16	45	17	46
(M22)	3.5	19.75	17.65	30.84	29.16	49	18.7	50

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 1228 - 2006— High Strength Bolts with Large Hexagon Head for Steel Structures GB /T 9125 - 2003— Hex Bolt for Pipe Flange Connection GB /T 16939 - 1997— High Strength Bolts for Joints of Space Grid Structures

Technical Specifications & Availability

Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.

Request Technical Specifications WhatsApp Inquiry

Product Documentation|Application Consultation|Quick Chat

Technical Support Available

Material Certifications

Custom Specifications