Patent ID: 7108063

Claim:
A connection for sucker rods used in strings in petroleum wells to pump petroleum along production tubing from a down hole pump, comprising: a pair of sucker rods, each having a pin end with a flat transverse end face and at least an adjacent male threaded section; a coupler of known length between opposite end faces and having at least two interior female threaded sections receiving the male threaded sections of the pin ends, wherein the pin ends of the sucker rods include coupler end engagement members spaced apart from the end faces of the sucker rods and engageable against the coupler end faces; and the pin ends of the sucker rods are dimensioned in length relative to the coupler length to provide prestressing compressional loading forces between opposing end faces of the pin ends when the male threaded sections are matingly threaded to preselected penetrations in the coupler past engagement of the coupler end engagement members with the coupler ends.