What's New

• Updated the user interface to lighten the tap size picker for better text visibility.

App Description

Whether you use Metric taps and drills, US Standard taps and inch drills, or any combination of size types, this app has the answers. No typing required; just tap your thread type and spin the dials to find the correct size of drill for your thread tapping operation.

The interface allows for selection of the following variables to calculate your required drill size:
• Thread Type,
• Tap Size,
• Percentage Depth of Thread,
• Through Hole Clearance,
• Cutting or Forming Operation

The closest drill bits are given in Metric, Fractional Inch, and US No. / Letter sizes, making this the perfect tool for those using a mix of tap and drill types.

The app ensures complete control and accuracy of your operations by recalculating the actual percentage-depth-of-thread and through-hole clearance for each closest drill bit size.

Thread types include:
• US Standard UNC, UNF, UNEF
• ISO Metric coarse, fine
• National Pipe Thread - Tapered (NPT)
• National Pipe Thread - Straight (NPS/NPP)
• British Pipe Standard Thread - BSP (Parallel - G)
• British Pipe Standard Tapered Thread - BSPT (Parallel - R / Rp)

A helpful reference tool for engineers, machinists, trades-men, students, tool makers, DIYers, fitters and turners, and fabricators, etc.

iPhone Screenshots

(click to enlarge)

Drill and Tap Tool - Through Hole and Thread Tapping Charts - Drills in Inch Imperial and Metric Sizes screenshot 1 Drill and Tap Tool - Through Hole and Thread Tapping Charts - Drills in Inch Imperial and Metric Sizes screenshot 2 Drill and Tap Tool - Through Hole and Thread Tapping Charts - Drills in Inch Imperial and Metric Sizes screenshot 3 Drill and Tap Tool - Through Hole and Thread Tapping Charts - Drills in Inch Imperial and Metric Sizes screenshot 4 Drill and Tap Tool - Through Hole and Thread Tapping Charts - Drills in Inch Imperial and Metric Sizes screenshot 5

App Changes

  • December 01, 2011 Price decrease: $1.99 -> $0.99
  • December 06, 2011 Price increase: $0.99 -> $1.99
  • January 05, 2012 Price decrease: $1.99 -> $0.99
  • January 07, 2012 Price increase: $0.99 -> $1.99
  • December 03, 2012 New version 3.0.0
  • August 16, 2013 New version 3.1.0
  • October 16, 2013 New version 3.2.0
  • October 31, 2013 New version 3.3.0

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