Patent ID: 7416374

Claim:
A thread form for securing together mating threaded components, comprising: a stab flank, a load flank, a thread root connecting said stab flank and said load flank whereby said stab flank and said load flank define an included angle in the gap bridged by said thread root, a thread root truncation length measured along the bisector of the included angle between the thread root and the apex of the included angle, a first surface of revolution having a first radial length included in said thread root, a second surface of revolution having a second radial length included in said thread root, said first radial length being greater than said second radial length, centers of revolution for said first and second surfaces of revolutions being disposed on the stab flank side of a bisector of the included angle, said first radial length and said second radial length each being greater than said thread root truncation length with the ratio of said second radial length to said first radial length being at least 0.6, wherein this is a stab flank flat surface lying at an angle different than said stab flank, said stab flank flat connecting said second surface of revolution with said stab flank, and said second radial length being greater than the length of said stab flank flat surface.