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Deadening the blow:
through hardened (toughened)
1/2 UNC Imperial 40 Piece Zinc Plated hex Bolt & Set Screw selection pack
Overall length L1 291mm
Jaws are hardened 45 +/- 5 HRC
3/4" UNF HSSE V3 Blue Spiral Point Tap ISO529 T4401905 2523390 Deadening the blow:Spiral Point or Gun Nose taps are mainly used for Machine Tapping of through holes. The point helps to direct the chips ahead of the tap leaving the flutes clear for the free flow of coolant to the cutting edge.