This page is available at https://www.rwfa.com.au/Products/Flange-serrated-nuts/

Flange Serrated Nuts

Flange Serrated Nuts

Metric and imperial flange serrated lock nuts (whiz-lock nuts),
non-serrated nylon insert flange nuts and imperial non-serrated
prevailing torque lock nuts.
This page is available at https://www.rwfa.com.au/Products/Flange-serrated-nuts/