CFR › Title 7 › Part 51 › §51.22857 CFR §51.2285Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)All percentages shall be calculated on the basis of weight.(b)In order to allow for variations incident to proper sizing and handling, tolerances shall be permitted for the respective size classifications as indicated in Table III: