GB/T 70.3-2023: Hexagon socket countersunk head screws with reduced loadability

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Scope

This Document specifies the type, dimensions, technical conditions, marking, labels and signs
of hexagon socket countersunk head screws with reduced loadability due to head design.
This Document is applicable to hexagon socket countersunk head screws with thread
specifications M2~M20; coarse threads; performance levels 8.8, 10.9 and 12.9; groups and
performance levels A2-50, A4-50, A2-70, A4-70, A2-80 and A4-80, and Level-A products.
NOTE 1: For other size options, see GB/T 2, GB/T 197 and GB/T 3106.
NOTE 2: Reduced loadability (related to the combination of countersunk head size and hexagonal
penetration depth specified in this Document) implies a limit to the minimum tensile load (see Table 5).
NOTE 3: Special attention needs to be paid to ensure that the countersunk head is aligned with the
countersunk hole support surface in the assembly.

Basic Data

Standard ID	GB/T 70.3-2023 (GB/T70.3-2023)
Description (Translated English)	Hexagon socket countersunk head screws with reduced loadability
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J13
Classification of International Standard	21.060.10
Word Count Estimation	16,110
Date of Issue	2023-05-23
Date of Implementation	2023-12-01
Older Standard (superseded by this standard)	GB/T 70.3-2008
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration