Standard Inside Coil Diameters
Inch .010 .013 .015 .018 .020 .025 .030 .035 .040 .045 .050
.mm .254 .33 .38 .45 .51 .64 .76 .89 1.0 1.14 1.27
Typical AWG Wire Size #50 #50 #50 #50 #48 #47 #44 #42 #42 #42 #40
#48 #48 #48 #48 #47 #46 #42 #40 #40 #40 #38
#47 #47 #47 #47 #46 #44 #40 #38 #38 #38 #36
#46 #46 #46 #46 #44 #42 #38 #36 #36 #36 #34
#44 #44 #44 #44 #42 #40 #36 #34 #34 #34 #32
    #42 #42 #40 #38 #34 #32 #32 #32 #30
    #40 #40 #38 #36 #32   #30 #30 #28
    #38 #38 #36            
      #36 #36