Patent ID: 6848724

Claim:
A connection for a threaded pin and box constructed of a material having a modulus of elasticity “E” and having makeup shoulders that contact when threads of the pin and box are fully engaged, comprising: a pin thread having a load flank and a stab flank wherein axial force on said load flank is increased as axial force “F” on said makeup shoulders increases, said pin having a cross sectional area of “A(pin)” at a mean thread diameter of said pin, a box thread having a cross sectional area of “A(box)” at a mean thread diameter of said box, a nominal thread pitch “p” for said box thread and said pin thread, and an average change in effective pitch “dp(avg)” over at least a portion of said pin thread of: d ⁢ ⁢ p ⁡ ( avg ) = F · p 2 · E ⁢ ( 1 A ⁡ ( pin ) + 1 A ⁡ ( box ) ) .