GB/T 2673.2-2020: Hexalobular socket high countersunk head screws

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Scope

This Part of GB/T 2673 specifies the type dimensions, technical conditions and markings of
hexalobular socket high countersunk head screws, as well as gauge size that controls the height
of the head.
This Part is applicable to hexalobular socket high countersunk head screws with the thread
specification of M3 ~ M10, the performance grade of 4.8, 8.8 and 10.9, and the product grade
of Grade-A.
NOTE 1: in comparison with ordinary countersunk head screws, the height of the head is slightly
increased, so that the screws can have the full load-bearing capacity that complies with
the stipulations of GB/T 3098.1.
NOTE 2: due to the increased head height, the screws specified in this Part are not completely
interchangeable with other metric countersunk head screws. The countersink of the
assembled parts also needs to be slightly deeper than the depth specified in GB/T 152.2.

Basic Data

Standard ID	GB/T 2673.2-2020 (GB/T2673.2-2020)
Description (Translated English)	Hexalobular socket high countersunk head screws
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J13
Classification of International Standard	21.060.10
Word Count Estimation	8,891
Date of Issue	2020-03-06
Date of Implementation	2020-10-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration