Flange Hole Marker is used to calculate flange hole markings of equispaced holes, Holes at any Angles and Equivalent No. of Holes. Unit setting Options are available with mm and inches. This App has the following Flange hole Calculator available: 1. Equispaced Holes Calculators. 2. Holes at Any Angles. 3. Equivalent No. of Holes. This app is very useful during hole center Marking on the flange at a given Pitch Circle Diameter. This app gives hows much cord length is required to divide the required No of holes on our available Pitch Circle Diameter. This app is very useful for those who are dealing with flange hole marking or bolt hole marking on flanges or any other application where we had to divide the required no of parts on pitch circle diameter. This app is for professionals and any others who are working in the field of fabrication of process equipment such as pressure vessel, heat ex changer, storage tank,reactor, agitator or mixer and heavy engineering Equipment. In this app Inputs required only pitch circle diameter ( PCD )or bolt-hole circle diameter ( BCD ).