| 摘要 |
A plug gauge comprises a main body. The main body comprises a supporting rod (1) and a disk (2) disposed at the end of the supporting rod (1). A key slot is provided on the inner circumferential surface of the disk (2). A bulge on the supporting rod (1) is disposed in the key slot. The disk (2) is made from a ceramic material. The outer surface of the disk (2) in a circumferential direction is coated with a quartz crystal layer (3). The thickness of the quartz crystal layer (3) is 1.5 to 5mm. The plug gauge has the advantage that the service life is prolonged by means of the ceramic layer and the quartz crystal layer. |
