Patent ID: 8267436

Claim:
A thread form for making a threaded pipe connection capable of being screwed together and subsequently unscrewed, the thread form comprising: a pin having external threads with stab flanks and load flanks and flat crests and roots for mating with the mating internal threads of a box to make up a pipe connection, and wherein the stab flanks and load flanks are each comprised of only two facets, and wherein the facets on the stab flanks and the corresponding facets on the load flanks of each thread both lean in the same direction in imaginary parallel planes, so that the facets form an arrow-shape when viewed in profile; and wherein the presence of only two facets on each of the respective stab flanks and load flanks and the fact that the respective corresponding facets on the stab and load flanks both lean in the same direction allow the thread form to be machined in either of two opposite directions resulting in thread forms which are exact mirror images of one another, one mirror image thread form being useful for pipe connections where the pipes are in tension and one mirror image thread form being useful for pipe connections where the pipes are in compression.