Patent ID: 7007984

Claim:
A multi-step threaded tubular connection, comprising: a pin connector having a large diameter pin thread area and a smaller diameter pin thread area formed about a central pin axis, a box connector with a large diameter box thread area and a smaller diameter box thread area formed about a central box axis, said large diameter pin thread area being threadedly receivable within said large diameter box thread area and said smaller diameter pin thread area being threadedly receivable within said smaller diameter box thread area, a pin thread tooth coaxially formed externally on said smaller diameter pin thread area, said pin thread tooth advancing helically from one axial point on said pin connector toward a nearest axial end of said pin connector, a pin crests on said pin thread tooth, having a crest widths measured parallel to said pin axis, a box thread tooth coaxially formed internally on said large diameter box thread area, said box thread tooth advancing helically from one axial point on said box connector toward a nearest axial end of said box connector, and a box thread groove defined between adjacent helical segments of said box thread tooth, said box thread groove having a groove width measured parallel to said box axis the pin tooth crest nearest said nearest axial pin end cannot radially enter said box thread groove nearest said nearest axial end of said box connector sufficiently to hang-up said pin and box upon stabbing or destabbing of said pin.