Patent ID: 8680758

Claim:
A spark plug, comprising: an annular metal shell having a through cavity extending axially along a central axis; an annular, lower insulator received at least in part in said through cavity of said metal shell, said lower insulator having a through passage extending between an upper end and a lower end; a ground electrode operatively attached to said shell, said ground electrode having a ground electrode sparking surface; a center electrode received at least in part in said through passage of said lower insulator, said center electrode having a center electrode sparking surface extending from said lower end of said lower insulator to provide a spark gap between said center electrode sparking surface and said ground electrode sparking surface; an elongate conductive member; an annular, plastic upper insulator having a distal end received in said through cavity of said metal shell and a terminal end extending axially outwardly from said metal shell, said upper insulator having a through passage extending between said terminal end and said distal end, said elongate conductive member being received at least in part in said through passage of said upper insulator and being configured for electrical communication with said center electrode; and wherein said lower insulator has a radially inwardly extending annular pocket and said upper insulator has an annular shoulder extending into said annular pocket, said shoulder and said pocket confronting one another and preventing relative axial movement between said lower insulator and said upper insulator.