In  the  U.S.  99%  of  commercial  doors  are  1  ¾”  thick.  Most  standard  door  hardware  is  manufactured  to  fit  1-3/8"  -  2"  thick  doors.  Some  manufacturers  have  extension  kits  to  fit  a  thickness  over  2  inches.  A  typical  residential  interior  door  is  1-3/8"  thick  and  an  exterior  door  is  1-3/4"  thick.  Again,  interior  and  exterior  commercial  doors  are  1-3/4"  thick.

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