improve the appearance

improve the wear resistance property

prevent them from getting corroded

be used only on automatic threading machines

Piece of sheet metal clamped to the holder in the path of the coil

A step is ground on the throw away insert along the cutting edge

A small groove ground at the cutting edge

A carbide bit is screwed and held on the top face of the bit

slightly more than the half pitch

slightly less than the half pitch

equal to the half pitch

equal to the pitch

welding

brazing

soldering

clamping with a screw

High speed steel

High carbon steel

Stellite

Tungsten carbide