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Three Quarter Inch 3/4″ (21mm) Electrical Conduit Dimensions

Three Quarter Inch 3/4″ is the trade size, not the actual dimension of electrical conduit.  Twenty One 21 is the metric designator not the actual dimension in millimeters.  The  dimensions for various types of 3/4″ electrical conduit are below.  The information was derived from several sources and should not be considered precise.  Dimensions may vary slightly between manufacturers. 3/4 Inch Electrical Conduit Dimensions 3/4″ (21) Electrical Metallic Tubing (EMT or Thinwall) is a smooth light weight galvanized metal conduit that has an inside diameter of .824" or 20.93mm.  It has an outside diameter of 0.922″ or 23.4mm.  The wall thickness of 3/4″ EMT is .049″ or 1.25mm.  It requires a 1 1/8"″ hole for the conduit fittings.  A tap needs a 59/64″ hole.  Threads per inch for the fittings is 14 NPT. 3/4″ (21) Rigid Metal Conduit (RMC) is a heavy weight conduit with a galvanized finish throughout.  It has factory threads with a 3/4″ per foot taper.  100′ of 3/4" RMC weighs approximately 109 pounds or 49.4 kilograms.  It has an inside diameter of 0.824" or 20.93mm.  It has an outside diameter of 1.050″ or 26.7mm.  The wall thickness is .107″ or 2.70mm.  It requires a 1 1/8"″ hole for the conduit fittings.  A tap needs a 59/64″ hole.  Threads per inch for the fittings is 14 NPT. 3/4″ (21) Intermediate Metal Conduit (IMC) is a lighter weight version of RMC.  It has a galvanized finish inside and out and can be used in many of the same environments as RMC.  It has factory threads with a 3/4″ per foot taper.  It also utilizes the same couplings and fittings as RMC.  3/4" IMC has an inside diameter of 0.864" or 21.9mm.  It has an outside diameter of 1.029″ or 26.1mm.  The wall thickness is .083″ or 2.1mm.  It requires a 1 1/8"″ hole for the conduit fittings.  A tap needs a 59/64″ hole.  Threads per inch for the fittings is 14 NPT. 3/4″ (21) Flexible Metal Conduit (FMC or Greenfield) is a galvanized finished flexible metal electrical conduit composed of a continuously formed interlocking metal strip.  3/4" FMC has a minimum inside diameter of 0.812" or 20.6248mm and a maximum inside diameter of 0.835″ or 21.209mm.  It has a minimum outside diameter of 1.045″ or 26.543mm and a maximum outside diameter of 1.105″ or 28.067mm.  The minimum bending radius is 5 inches or 101.6mm.  It requires a 1 1/8"″ hole for the conduit fittings.  A tap needs a 59/64″ hole.  Threads per inch for the fittings is 14 NPT. 3/4″ (21) Rigid Polyvinyl Chloride Conduit (PVC) schedule 40 is a nonmetallic, non-conductive electrical conduit that is good to use indoors and outdoors, or underground.  It has some flexibility with an inside diameter of 0.824″ or 20.9296mm.  It has an outside diameter of 1.050″ or 26.67mm.  The wall thickness is .113″ or 2.8702mm.  It requires a 1 1/8"″ hole for the conduit fittings.  A tap needs a 59/64″ hole.  Threads per inch for the fittings is 14 NPT. 3/4″ (21) Rigid Polyvinyl Chloride Conduit (PVC) schedule...