51.2954—Tolerances for grade defects.
In order to allow for variations incident to proper grading and handling, the following tolerances shall be permitted for nuts which fail to meet the requirements of the respective grades as indicated. Terms in quotation marks refer to color classifications illustrated on the color chart.
| Grade | External (shell) defects | Internal (kernel) defects | Color of kernel |
|---|---|---|---|
| U.S. No. 1. | 10 pct, by count for splits. 5 pct. by count, for other shell defects, including not more than 3 pct seriously damaged | 10 pct total by count, including not more than 6 pct which are damaged by mold or insects or seriously damaged by other means, of which not more than 5/6 or 5 pct may be damaged by insects, but no part of any tolerance shall be allowed for walnuts containing live insects | No tolerance to reduce the required 70 pct of “light amber” kernels or the required 40 pct of “light” kernels or any larger percentage of “light amber” or “light” kernels specified. |
| U.S. No. 2. | 10 pct, by count, for splits. 10 pct, by count, for other shell defects, including not more than 5 pct serious damage by adhering hulls | 15 pct total, by count, including not more than 8 pct which are damaged by mold or insects or seriously damaged by other means, of which not more than 5/8 or 5 pct may be damaged by insects, but no part of any tolerance shall be allowed for walnuts containing live insects | No tolerance to reduce the required 60 pct or any specified larger percentage of “light amber” kernels, or any specified percentage of “light” kernels. |
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Code of Federal Regulations
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| U.S. No. 3. | Same as above tolerance for U.S. No. 2 | Same as above tolerance for U.S. No. 2 | No tolerance to reduce any percentage of “light amber” or “light” kernel specified. |