Plug chamfers are the most commonly used chamfer
and are designed for efficiently threading through and blind holes. They
have 3 to 5 threads.
Oxide, also known as black oxide or steam oxide,
is a surface treatment that prevents chip building, galling and welding
on the workpiece. It is commonly used on low carbons, stainless steel
and ferrous metals.
Vanadium High Speed Steel (HSSE) is made of high
speed steel, carbon, vanadium carbide and other alloys to increase
abrasive wear resistance and toughness. It is commonly used in general
applications on stainless steels and high silicon aluminums.