The below video provides a short explanation of the threading terms (0.1875/0.0625=3) Designation Examples of Unified Threadsĭiameter TPI=20 18 16 14 13 12 11 10 9 8 7 6 5 4.5 4 1 9/16 20-UN UNEF 16-UN 12-UN 8-UN 6-UN 1 5/8 20-UN UNEF 16-UN 12-UN 8-UN 6-UN 1 11/16 20-UN UNEF 16-UN 12-UN 8-UN 6-UN 1 3/4 20-UN 16-UN 12-UN 8-UN 6-UN UNC 1 13/16 20-UN 16-UN 12-UN 8-UN 6-UN 1 7/8 20-UN 16-UN 12-UN 8-UN 6-UN 1 15/16 20-UN 16-UN 12-UN 8-UN 6-UN 2 20-UN 16-UN 12-UN 8-UN 6-UN UNC 2 1/8 20-UN 16-UN 12-UN 8-UN 6-UN 2 1/4 20-UN 16-UN 12-UN 8-UN 6-UN UNC 2 3/8 20-UN 16-UN 12-UN 8-UN 6-UN 2 1/2 20-UN 16-UN 12-UN 8-UN 6-UN UNC 2 5/8 20-UN 16-UN 12-UN 8-UN 6-UN 4-UN 2 3/4 20-UN 16-UN 12-UN 8-UN 6-UN UNC 2 7/8 20-UN 16-UN 12-UN 8-UN 6-UN 4-UN 3 20-UN 16-UN 12-UN 8-UN 6-UN UNC 3 1/8 16-UN 12-UN 8-UN 6-UN 4-UN 3 1/4 16-UN 12-UN 8-UN 6-UN UNC 3 3/8 16-UN 12-UN 8-UN 6-UN 4-UN 3 1/2 16-UN 12-UN 8-UN 6-UN UNC 3 5/8 16-UN 12-UN 8-UN 6-UN 4-UN 3 3/4 16-UN 12-UN 8-UN 6-UN UNC 3 7/8 16-UN 12-UN 8-UN 6-UN 4-UN 4 16-UN 12-UN 8-UN 6-UN UNC 4 1/8 16-UN 12-UN 8-UN 6-UN 4-UN 4 1/4 16-UN 12-UN 8-UN 6-UN 4-UN 4 3/8 16-UN 12-UN 8-UN 6-UN 4-UN 4 1/2 16-UN 12-UN 8-UN 6-UN 4-UN 4 5/8 20-UN 16-UN 12-UN 8-UN 6-UN 4-UN 4 3/4 16-UN 12-UN 8-UN 6-UN 4-UN 4 7/8 16-UN 12-UN 8-UN 6-UN 4-UN 5 16-UN 12-UN 8-UN 6-UN 4-UN 5 1/8 16-UN 12-UN 8-UN 6-UN 4-UN 5 1/4 16-UN 12-UN 8-UN 6-UN 4-UN 5 3/8 16-UN 12-UN 8-UN 6-UN 4-UN 5 1/2 16-UN 12-UN 8-UN 6-UN 4-UN 5 5/8 16-UN 12-UN 8-UN 6-UN 4-UN 5 3/4 16-UN 12-UN 8-UN 6-UN 4-UN 5 7/8 16-UN 12-UN 8-UN 6-UN 4-UN 6 16-UN 12-UN 8-UN 6-UN 4-UNĭ 1 Minor diameter of internal thread D 2 Pitch diameter of internal thread D 3 Major diameter, rounded root, internal thread d Major (Basic) diameter of external thread d 1 Minor diameter of external thread d 2 Pitch diameter of external thread d 3 Major diameter, rounded root, internal thread n Number of threds per Inch (TPI) P Pitch (Distance) L Lead Height Parameters H Height of fundamental triangle h s Thread height - External thread h as Thread addendum - External thread h n Thread height - Internal thread h an Thread addendum - Internal thread Length Parameters LE Length of thread engagement L ts Length of complete external thread L tn Length of complete internal thread Allowance, Deviation, and Tolerances T D1 Tolerance for D 1 T D2 Tolerance for D 2 T d Tolerance for d T d2 Tolerance for d 2 es Allowance for external thread Root / Creast Parameters F cs Flat crest width of external thread F rs Flat root width of external thread F cs Flat crest width of internal thread F cs Flat root width of internal thread For example: 3/4– 0.0625 P – 0.1875 L UNF denotes a 3/4″ UNF thread with 3 starts. For a multiple-start thread, the lead is also indicated. Number of Starts: By default, all threads have a single start.For a left-hand thread, add the suffix -LH. Direction: By default, the thread is right-hand. ![]()
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