UNF Spiral Point Tap Set

• 6G - 1/2" UNF Spiral Point Tap Set

About UNF Unified National Fine

• This 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.

About Spiral Point Tap

• Are used for machine tapping blind and through holes where there is sufficient clearance to accomodate chips.
• Manufactured from HSS-Co5 this modern design tap uses straight flutes supplemented by angular cutting faces at the point to produce a fine finish on the threads.
• Shallower flutes achieve a stronger cross section allowing the tap to withstand greater cutting forces.

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