ISO 3161:1999 PDF

Scope: This International Standard specifies the general requirements and limit dimensions of inch series UNJ threads with controlled root radius for aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for designating the diameter and number of threads per inch combinations. For all diameters 0,060 in (1,524 mm) to 6,000 in (152,4 mm), it offers in the form of tables the basic dimensions and tolerances for a selection of diameter and number of threads per inch combinations. It also provides the method of calculation for the dimensions and tolerances for any diameter and number of threads per inch combination not given in the tables, including threads with a diameter in excess of 6,000 in.

ISO 3161:1999 history

1999 ISO 3161:1999 Aerospace - UNJ threads - General requirements and limit dimensions
1996 ISO 3161:1996 Aerospace - UNJ threads, with controlled root radius, for aerospace - Inch series
1977 ISO 3161:1977 UNJ threads, with controlled root radius, for aerospace; Inch series