The thread profile of UNF is the same as for metric threads and is described in the JIS B0206 standard
Ideally the drill should be Left Hand" which will prevent further tightening of the fixing during drilling
The intersection of the hole and cone form the cutting edge on the tool
Cross hole countersinks are ideal for countersinking and deburring in a wide range of materials including ferrous and non-ferrous metals
Cemented carbide insert is an alloy of Tungsten Carbide (WC) and Cobalt (Co)
Saber Essential 4 - 32mm HSS Spiral Flute TiN Coated Step Drill The thread profile of UNFSaber Essential 4 32mm HSS Spiral Flute TiN Coated Step Drill Saber step drills are ideal for electrical contractors, sheetmetal workers and auto mechanics. 1 4" hex shank for fast tool changing in impact drivers and quick change adaptors. Step drills are designed for drilling repetitive holes in steel, stainless steel, copper, brass, aluminium, plastic, plexiglas, laminates and many other thin materials. Manufactured from premium quality high speed