General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 802.5-2009
Scope
This part of GB/T 802 specifies the welded non-metallic insert hexagonal lock cap nuts with thread specifications M4~M20, performance grades 5, 6, 8, 10, and product grades A and B. Grade A is used for D≤16mm; Grade B is used for nuts with D>16mm.