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https://www.dtnut.com/products/iso-7041-gr-9-12-locking-nuts-iso-7719-gr-5-8-10-locking-nuts/

Originated in the United States, ISO 7041 Din&7719 self-tightening nuts are permanently attached to the thread with a special engineering plastic, so that the inner and outer threads are compressed during the tightening process, and the engineering plastic is squeezed to generate a strong reaction force, which greatly increases the distance between the inner and outer threads. Friction, which provides absolute resistance to vibration.

ISO 7041&7719 Steel Self-Tightening Locking Nuts Specifications
ISO 7041 Locking Nuts
ISO 7041 - 2012 Prevailing Torque Type Hexagon Nuts(with Non-metallic Insert),style 2,classes 9 And 12

ISO 7041 GR. 9, 12 Selflocking Nut Dimensions

LegendMaking
P=pitchCarbon Steel:9，12
K=height of the nutThread:6H
D=the nominal diameter of the threadSurface:BLK,ZP,HDG,etc
E=The length of the diagonal
S=The length of the flat

ISO 7719 Locking Nuts
ISO 7719 - 2012 Prevailing Torque Type All-Metal Hexagon Regular Nuts-Property Classes 5,8 And 10

ISO7719 GR.5, 8, 10 Self Tightening Nuts Dimensions

LegendMaking
P=pitchCarbon Steel:5, 8 ,10
K=height of the nutThread:6H
D=the nominal diameter of the threadSurface:BLK,ZP,HDG,etc
E=The length of the diagonal
S=The length of the flat

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