Patent ID: 9190812
Filing Date: 2015-11-17
Classification: F02P,H01T

Abstract:
1. A spark plug comprising: a tubular metallic shell extending along an axis and a solid annular gasket made of metal and provided externally of an outer circumference of the metallic shell, the metallic shell having the gasket having an inside diameter smaller than a thread diameter of the externally threaded portion and being provided between the externally threaded portion and the seat portion, the spark plug being characterized in that a forward end surface of the gasket has an inclined portion which inclines rearward with respect to a direction of the axis from a radially outer side toward a radially inner side, a thickness of the gasket along the axis is 2.0 mm or less, a distance along the axis between an outermost circumferential edge and an innermost circumferential edge of the inclined portion is 0.02 mm to 0.12 mm, and a Vickers hardness of the gasket is 60 Hv or more.