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Information required for ordering special Acme Taps or Trapezoidal (metric) taps

• Size and Pitch of Thread
  
• Class of Fit or Gauge Tolerances
  
• Right or Left Hand
  
• Thread Form
  
• Lead - Single, Double etc.
  
• Type of Material to be threaded - Grade, hardness and machining properties are all helpful
  
• Type of hole to be threaded - Thru or Blind, if blind advise amount of clearance at bottom of hole
  
• Depth of hole to be threaded, indicate any reach if applicable
  
• addition information
  • Will Machine or Fixture affect the length of tap(s)
  • Will tap pass through or back out
  • Other features required: keyways, threaded shanks, oil holes, stepped shanks, hex drives etc.
  • Submit drawings or prints if possible
  • Coatings required: TiN, CrN, TiCN, Nitride, Steam Oxide etc.

link to calculate acme tap drill size

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