Igniter plug.

摘要

An igniter plug having a tungsten center electrode (5) supported by a conductive pin (13) and an annular electrode (3) with an air gap (15) between said electrodes is provided with a nickel coating (21) on the tungsten center electrode (5) and a portion of the supporting pin (13), and with a collar (27) situated within a portion of the annular electrode (3) to retain a ceramic sleeve (17) within the air gap (15).