NZS 1227.1 and 2:1963
Specification for Unified screw threads - Diameters one-quarter in and larger
(=BS 1580:Parts 1 and 2:1962) Unified coarse thread series UNC 0.25 in to 4 in diameter; Unified fine thread series UNF 0.25 in to 1.5 in; Unified extra fine thread series UNEF 0.25 in to 1.6875. Standard constant pitch series for a graduated system of diameter/pitch combinations. Basic and design forms. Tables of basic dimensions, limits and tolerances for all diameter/pitch combinations in UNC, UNF, UNEF and standard constant pitch series given for the three classes of internal and external threads. Bases of tolerances for Unified screw threads; five sizes below 0.25 in diameter for attachment purposes and for general use in aircraft appended. Evolved through international discussions between UK, Canada, USA. In accord with corresponding sections of American standard ASA B1.1-1960. Reprinted incorporating Amend: 1, 2
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