Tools & Gear Taps & Dies HSS-Co5 Spiral Point (Gun Nose) Taps

• 1 "x 14 UNS Spiral Point (GUN) HSS-Co5 Tap - Goliath
• HSS-Co (Cobalt) Bright Finish UNS Spiral Point Machine Tap.
• HSS-Co Spiral Point (Gun Nose) Taps.
• Spiral point taps, also known as "Gun nose taps", have straight flutes supplemented by angular cutting faces at the lead.
• The design of the cutting portion propels the swarf ahead of the tap leaving the flutes clear for the flow of coolant to the cutting teeth.
• Primarily designed for use in through holes, these taps can be used in blind holes provided that there is ample clearance beyond the threaded section to accommodate the swarf.
• The advantages of a gun nose tap are the shearing action of the angular cutting faces, which produces a fine finish on the threads and shallower flutes.
• This allows a stronger cross section throughout the tap.
• Unified National Special (UN) thread form was introduced in 1948 as an attempt to standardise thread forms in the USA, Canada and the UK.
• The thread profile of UNS is the same as for UN and 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).
• UNS threads need to have the TPI specified; however the number of TPI for a specific diameter is limited.
• For example, within 1?2" diameter size, the TPI allowed are: 1?2" - 12 UNS, 1?2" - 14 UNS, 1?2" - 18 UNS, 1?2" - 24 UNS and 1?2" - 27 UNS.
• 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.