A die nut is nothing but

A nut forged by using dies

A die in the shape of a nut

A nut for tightening the die in the die stock

A die which is used for cutting threads in nuts

Flat file but uniform in width

Hand file but narrow in width

Flat file but thinner in thickness

Flat file but thinner and uniform in thickness

MT-1 taper

MT-2 taper

MT-3 taper

MT-4 taper

Aluminium oxide wheel is used

Silicon carbide wheel is used

Diamond wheel is used

Corundum wheel is used

Thin section metal

Soft metals

broad section metals

Non-metals