A-A-51125B
CID based part identification number (PIN). The following part identification numbering procedure is for Government purposes and does not constitute a requirement for contractor. Where applicable, Arabic numbers shall be substituted for Roman numerals. Refer to the salient characteristics for origination of the correct letters of number to complete the PIN.
A-A-51125 X X X X X XX
A- Prefix
51125- CID
X- Type
X-Style (tooth form)
X- Toothset designation
X- Width designation
X- Thickness designation
XX- Pitch designation
Cross reference of classification changes. Classification changes from the previous issue are as follows:
|
A-A-51125A |
A-A-51125B |
|
Type I, sizes listed |
Sizes deleted (PIN number added) |
|
Type II, sizes listed |
Sizes deleted (Pin number added) |
Federal Standard FED-STD-376 is available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19120-5099.
ASME 894.51M is available from the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10018-3363.
ASTM E 18 is available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.
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