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A-A-51131 Revision A, January 30, 1990
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TOOL HOLDER, SHAPER EXTENSION
Includes all amendments and changes through Cancellation Notice 2, March 22, 2007
Additional Comments: CNCL NO S/S
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This description covers tool holders with shaper extension bar and holder of the standard, heavy duty, commercial type, which are used in a production environment.

Tool holders covered by this description shall be of the sizes specified in table I. The size to be furnished shall be as specified (see 6.1). Shaper extension bar sizes and bushing sizes for the shaper extension holder shall be of the sizes listed in tables II and III. The sizes to be furnished shall be as specified (see 6.1). The tolerances for all dimensional data shall be the manufacturer's standard as specified on their part drawings. TABLE I. Tool holder, size and dimensions.
Tool holder   Thickness of    Height of       Length of      Diameter of
size          shank; inches   shank; inches   shank; inches  bar hole; inches
------------------------------------------------------------------------------
  3               ⅜               ⅞          4                  ¾
  0               ½             1-⅛          5                  ¾
  1               ⅝             1-⅜          5-¾             15/16
  2               ¾             1-⅝          7                1-⅛


TABLE II. Shaper extension bar, size and dimensions.
Extension     Diameter of     Length of      Size of square
bar           extension bar;  extension bar; tool bit channel;
size          inches          inches         inches
-----------------------------------------------------------------
 01               ½             7-½              3/16
 02               ⅝             8-½              ¼
 03               ¾            10                  5/16
 04              15/16           12                  ⅜
 05              1-⅛           14                  7/16


Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this document should be sent to: Defense Industrial Plant Equipment Center, ATTN: DIPEC-SSG, 2163 Airways Blvd., Memphis, TN 38114-5051. TABLE III. Bushing size for shaper extension holder and dimensions.
Length of bushing;
             Outside work    Inside work         inches
Bushing      diameter;       diameter;
size         inches          inches          min............max.
-------------------------------------------------------------------------

 10            ¾             ½          1-¾          1-⅞
 11            ¾             ⅝          1-¾          1-⅞
 12           15/16            ½          2-3/16         2-5/16
 13           15/16            ⅝          2-3/16         2-5/16
 14           15/16            ¾          2-3/16         2-5/16
 20           1-⅛            ½          2-⅝          2-¾
 21           1-⅛            ⅝          2-⅝          2-¾
 22           1-⅛            ¾          2-⅝          2-¾
 23           1-⅛           15/16         2-⅝          2-¾