Description
Description
Bordo HSS Cobalt UNF Spiral Flute Tap (3234)
HSS-Co5 (Cobalt) UNF Spiral Flute machine tap.
Cobalt HSS taps are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steel.
Spiral Flute taps are designed primarily for machine tapping of blind holes.
They produce the best results in materials that produce long continuous chips.
The right hand spiral forces the swarf out of the hole and prevents the chips from clogging at the bottom of the hole or in the flutes, which could cause tap breakage or spoiled threads.
HSS-Co5 (Cobalt) UNF Spiral Flute machine tap.
Unified National Fine thread form was introduced in 1948 as an attempt to standardise thread forms in the USA, Canada and the UK.
The thread profile of UNF is the same as for metric threads and is described in the JIS B0206 standard.
The thread is described by its major diameter and the number of threads per inch of length (TPI).
When used on external threads this series has greater tensile stress area than coarse threads of the same size.
Fine series threads will resist stripping out better than coarse threads in areas where the external and mating internal threads are subjected to loads equal to or greater than the capacity of the screw or bolt.
Fine threads are also used where the length of engagement is limited 1-1/4 or where wall thickness demands a fine pitch.