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AMS 2431B Peening Media General Requirements
Section 3.3.4 States Size shall be determined in accordance with ASTM E 11, ASTM B 214.

We are only concerned with ASTM B 214 for this discussion.

ASTM B 214 Standard Test Method for Sieve Analysis of Metal Powders
Section 5.2 Sieve Shaker.
“The number of rotations per minute shall be between 270 and 300. The number of taps per minute shall be between 140 and 160.

AMS 2431/1 & /2 Section 3.9.1 Size Screening Test
“The rotating speed shall be 275-295 RPM and the tapping speed shall be 145 to 160 taps per minute.”

It seems to me that section 3.9.1 of AMS 2341/1, /2 needs to be revised.
I would like to see the wording changed to:
"The size of shot, specified in 3.8, shall be determined in accordance with ASTM B 214.”

No further verbiage is required. As it stands now AMS 2431 and AMS 2431/1, /2 are in conflict.

ASTM B214 is Standard Test Method whereas the AMS 2431 series are Media Specifications. In my opinion only the requirements of the media should be detailed here. The methods of verification for each requirement should be called out by a specific Standard Test Method.