DE + 2r cosec - cot + 2r 2 2 2 a P a = DE +2r (1 + cosec) - cot 2 2 2 and, since 2r = d (the diameter of the wire), a P a W = DE + d (1 + cosec) - cot (1) 2 2 2 From this general formula we may apply the special adaptation for common threads.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Not tu menshun deh sec adn cosec and cotan!.    From Wordnik.com.  [fud pyramid - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?] Reference

P.D. 79 10 12 cosec. .00781.    From Wordnik.com.  [Lectures in Navigation] Reference

P.D. 106 36 24 cosec. .01849 + 1 2.    From Wordnik.com.  [Lectures in Navigation] Reference

(a) ISO metric and unified Fig. 1.9 (a) The effective diameter lies 0. 3248p inside the crest of the thread, Hence DE = D - 0. 6496p a a = 60° and cosec = 2 2 a cot = 1.732 2 a P a W (over wires) = DE + d (1 + cosec) - cot 2 2 2 P = D - 0. 6496p + d (3) - (1.732) 2 = D +3d - 1. 5156p.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference