No secrets here, just print this out, copy it down or remember where it's at.

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                      ~Clarinet Pads~

  Cat.#           Style                   Size              Thickness

    A54            Natural Cork           6.0 -  7.5mm        2.54mm / .100"
                                                       8.0 - 15.0mm       2.79mm / .110"

    B9           Norbeck Synthetic     7.0 - 20.0mm       2.54mm / .100"
    B9A         Norbeck Synthetic     9.0 - 20.0mm       3.55mm / .140"

                  ~All Clarinet pads below are of needle felt and beveled style~

    B10            Single Skin              6.5 -   8.5mm       2.9mm  /  .114"
    B11            Double Skin            9.0 - 13.5mm       3.6mm  /  .141"
                                                    14.0 - 20.0mm       3.9mm  /  .153"

    B17            'True' Double Skin   6.5 -   8.5mm       2.6mm  / .102"
    B20            Single Skin               9.0 - 13.5mm       3.0mm  / .118"
    B21            Double Skin           14.0 - 20.0mm       3.5mm  / .137"

    B24            Single Skin               6.5 -  8.5mm        2.3mm  / .090"
    B25            Double Skin             9.0 - 13.5mm       2.5mm  / .098"
                                                     14.0 - 20.0mm       2.8mm  / .110"
 

                    ~Oboe & Piccolo Pads~ 

    A54            Natural Cork            6.0 - 7.5mm         2.54mm / .100"
                                                        8.0 - 15.0mm       2.79mm / .110"

    B9           Norbeck Synthetic      7.0 - 20.0mm       2.54mm / .100"
    B9A         Norbeck Synthetic      9.0 - 20.0mm       3.55mm / .140"
               Norbeck's DO NOT work on metal surfaces!
                (metal octave vents, metal Piccolo body)

           ~All Piccolo & Oboe pads below are of woven felt and NOT beveled~

   B35, B37        Double Skin          6.5 - 15.5mm         2.3mm / .090"
   B28            Yellow Double Skin                    same as above

                        ~Flute Pads~

   B7   ~ De'Jur~ Double Skin           11.0 - 12.0mm    2.6mm / .101"  
                           (needle felt)           16.0 - 20.0mm    2.5mm / .098"

   B8 ~ De'Jur~Yellow Double Skin  11.0 - 12.0mm    2.6mm / .101"
                         (needle felt)             16.0 - 20.0mm    2.5mm / .098"

   B29               Double Skin            11.0 - 12.0mm      2.3mm /  .090"
                        (woven felt)            16.0 - 20.0mm      2.5mm / .098"

   B30              Double Skin     11 - 12.5, 13, 14mm     2.6mm  / .101"
   B30H           (woven felt)       15, 16 - 27.5mm         2.9mm  / .114"

   B31              Double Skin             11.0 - 12.0mm       2.6mm  / .101"
                       (needle felt)            16.0 - 20.0mm       2.9mm  / .114"

   B38         Yellow Double Skin      11.0 - 12.0mm       2.6mm  / .101"
                        (woven felt)            16.0 - 20.0mm       2.9mm  / .114"

   B26~ De'Jur~Yellow Double Skin  11.0 - 12.0mm     2.6mm / .101"
                         (needle felt)              16.0 - 20.0mm     2.9mm / .114"
{Note: All flute pads over 15mm have a 5.5mm center hole (.210") and fit Yamaha}

             ~Bassoon, Alto & Bass Clarinet~

                                         ~These are ALL woven felt~

   B32               Tan Kid                   7.0 - 35.5mm        3.2mm / .126"
   B33               White Kid               7.0 - 35.5mm         3.2mm / .126" 
   B33Oval       White Kid             12mm X 14.5mm      3.2mm / .126"
 

                        ~Saxophone Pads~

                               ~ALL Saxophone pads are of woven felt~
                        (Resonators start at 15mm or 20/32", unless noted)
                           ('Rivets only' on 20-25/32" or 16-20mm, in type)

  B40, B42                                       7.0 - 11.0mm         4.0mm / .160"
  B44, B47         Leather               11.5 - 70.0mm         4.7mm / .185"
  B53, B59

  B43, B46                                        7.0 - 11.0mm        3.5mm / .140"      
  B52, B58         Leather                11.5 - 70.0mm        4.0mm / .160"               

  B64                De' Jur                   7.0 - 70.0mm           4.0mm / .160"
  B66                De' Jur                   7.0 - 70.0mm           4.7mm / .185"

  B50~ Res-O     Leather                15/32" - 86/32"  as listed    .165"

  B56 Cone        Leather                20/32" - 88/32"                    .185"
  B56M Cone                                   16mm - 70mm                    4.7mm

  B62M Cone      Leather                16mm - 70mm          4.0mm/ .160"

  B60 Snap-on     Leather              10mm - 59mm as listed      various
 
As you can see, the sax pads are proportional to diameter in a given thickness.

     ~For exact specifications, see Catalog describing focus pad~