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A-A-51127 Revision A, January 12, 1990
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HOLDER, KNURLING TOOL, LATHE
Includes all amendments and changes through Reinstatement Notice 2, February 4, 2008
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This description covers tool holders that are designed to hold and support knurling tools that are used on bench and engine lathes.

Tool holders shall be of the following types and sizes. The type and size to be furnished shall be as specified (see 6.1).
     Type I    - Holder, knurling tool, single, lathe.
     Size      - Sizes shall be selected from table I.

     Type II   - Holder, knurling tool, multiple, lathe.
     Size      - Sizes shall be selected from table II.


TABLE I. Type I - Single knurling tool holder.
Knurl dimensions          
Tool       Thickness     Height     Length of      Outside   Thickness      Hole
holder     of shank;     of shank;  Shank;         diameter  of knurl;      diameter
size       inches        inches      -in.          inches    inches         inches

   4       5/16          ¾        2-15/16        ⅝       5/16           7/32
  10       ⅜           ⅞        3-¼          ⅝       5/16           7/32
  11       ½           1-⅛      3-¾          ¾       ⅜            ¼
  12       ⅝           1-⅜      5              ¾       ⅜            ¼
  13       ⅞           1-¾      5-¾          1         ⅜            5/16


TABLE II. Type II - Multiple knurling tool holder.
Length of           Knurl dimensions       
Tool       Thickness     Height     shank;      Outside    Thickness    Hole
holder     of shank;     of shank;  inches,     diameter;  of knurl;    diameter;
size       inches        inches     min.        inches     inches       inches
-------------------------------------------------------------------------------------
  20         ⅜           ⅞      2-½             ⅝     5/16         7/32
  21         ½         1-⅛      3-⅛             ¾     ⅜          ¼
  22         ⅝         1-⅜      3-⅛             ¾     ⅜          ¼