HSS Tap UNC Bottoming-5/16x18 UNCHB516

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  • Regular price $25.69
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BOTTOMING taps have a lead of two threads and are used when tapping blind holes. Usually preceded by a taper or intermediate tap. Alpha bottoming taps can be identified by their plain shaft, they have no rings on the shaft near the driving square.

  • Diameter: 5/16mm
  • Pitch: 18mm
  • Overall length: 53mm
  • Shaft Diameter: 6mm
  • Drive Square: 4.9mm
  • Tapping Drill Size: 6.60mm