The invention relates to a glow plug consisting of a plug body (2), a pressure sensor disposed thereinside, a threaded area (6) embodied on the external surface of the plug body (2) and gripping means (12) generally in the form of a cylinder having a hexagonal section which makes it possible to grip the body (2) and to screw it into an internal screw thread, wherein said gripping means (12) is made of a synthetic material.