UNC Spiral Point Tap and Drill Set

• 6G - 1/2" UNC Spiral Point Tap and Drill Set.

About UNC Unified National Coarse

• 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 UNC is 60 degrees 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).
• This thread series is commonly used in the mass production of bolts screws and nuts.
• It is used for threading into lower tensile strength materials (bronze brass aluminium and plastics) to obtain the best resistance to stripping of the internal thread.
• It is also used on quick assembly or disassembly or if corrosion or slight damage is possible.

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.
• M2-HSS premium quality jobber drills in tapping sizes to suit Spiral Point taps.

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