CFR›Title 7›Subtitle B›Chapter I›Part 51›Subpart Q›Subject Group Definitions ContainsSections 51.1580–51.1587CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Sections 51.1580 § 51.1580 Fairly well shaped. 51.1581 § 51.1581 Fairly clean. 51.1582 § 51.1582 Soft rot or wet breakdown. 51.1583 § 51.1583 Damage. 51.1584 § 51.1584 Internal discoloration. 51.1585 § 51.1585 Mature. 51.1586 § 51.1586 Serious damage. 51.1587 § 51.1587 Diameter. Previous Application of Tolerances Application of Tolerances Next Grades Grades