51.2280—Tolerances for grade defects.

(a) All percentages shall be claculated on the basis of weight.

(b) In order to allow for variations, other than for color and size, incident to proper grading and handling, tolerances shall be permitted for the respective grades as indicated in Table I:

Table I

Grade	Tolerances for grade defects
[Percent]
Grade	Total defects	Serious damage	Very serious damage	Shell and foreign material
U. S. No. 1	5	2 (included in 5 percent total defects)	1 (included in 2 percent serious damage)	0.05 (included in 1 percent very serious damage).
U.S. Commercial	8	4 (included in 8 percent total defects)	2 (included in 4 percent serious damage)	0.05 (included in 2 percent very serious damage).

CFR

51.2280—Tolerances for grade defects.