7 CFR § 51.2751 - U.S. Medium Virginia.
“U.S. Medium Virginia” consists of shelled Virginia type peanut kernels of similar varietal characteristics which are whole and free from foreign material, damage and minor defects, and which will not pass through a screen having 18/64 × 1 inch openings. Unless otherwise specified, the peanuts in any lot shall average not more than 640 per pound.
(a) In order to allow for variations incident to proper grading and handling, the following tolerances, by weight, shall be permitted:
(1) 1 percent for other varieties of peanuts;
(5) 0.1 percent for foreign material; and,
(6) 3 percent for sound, whole peanuts which will pass through the prescribed screen.