Cone proof load test on nuts
This Standard specifies the properties of nuts with
— nominal thread diameter, d, from 5 mm up to and including 39 mm,
— product grades A and B,
— property classes 8 to 12,
under the conditions of the cone proof load test.

Check out other specifications
Mechanical properties of fasteners – Nuts with coarse pitch thread and specified proof load values (ISO 898-2 : 1992) English version of DIN EN 20898 Part 2
TEST FOR EVALUATING THE TORQUE-TENSION RELATIONSHIP ON BOTH EXTERNAL AND INTERNAL METRIC THREADED FASTENERS
Hot rolled products of structural steels — Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels
Metallic products – Types of inspection documents
“TWIST OFF” TYPE TENSION CONTROL STRUCTURAL BOLT/NUT/WASHER ASSEMBLIES, STEEL, HEAT TREATED, 150 KSI MINUMUM TENSILE STRENGTH
Prevailing torque type hexagon thin nuts with nonmetallic insert