This standard specifies hex nuts with thread specifications of M12~M180×6; cover nuts with M12~M120×6; stress casing with dw=21~270. This standard is applicable to the fasteners used under the working conditions that can not only bear high temperature and alternating load, but also maintain the preload and fatigue strength to a considerable extent.
GB/T 13807.3-1992 history
2008GB/T 13807.3-2008 Connections with waisted stud.Nuts,extension sleeves
1992GB/T 13807.3-1992 Connections with waisted stud. Nuts,extension sleeves