From Meriden’s in 1977
1/2” x26 TPI nuts
Normally a 1/2” lei nut would have a 0.812” hex and about 0.420” thick
These are 0.700” hex and 1/2” deep
They work purposefully and very neat
Greasy but shop soiled
Hex and thread are good
Bag of 25 for a tenner