Judging the Advantages and Disadvantages of Copper Nut-Knurled Copper
Common types of knurled nuts on the surface of copper nuts: herringbone knurled nuts, reticulated knurled nuts, diamond knurled nuts, straight knurled nuts, twill knurled nuts, etc.
The first point to distinguish the quality of copper nuts can be distinguished from the knurling on the surface of the nuts.
The outer surface is smooth and clean, and there are no problems such as bruising, embossing, peeling, pinholes, cracks and corrosion.
The second point is to distinguish between good and bad copper nuts, which can be determined from the quality of the inner surface of the nuts. The inner surface is clean and free from oil stains, impurities and moisture. The internal thread has no burrs, cracks and damages. Inner surface, especially mating cone
The surface shall not have dents, scratches, dirt and other defects and corrosion phenomena that affect the sealing performance.
The third point is the structural size. The structural dimensions shall be measured with vernier calipers, ring gauges, general gauges, tooth gauges and other measuring tools, and shall meet the drawing requirements. Screw tooth dimensions (medium diameter, small diameter, large diameter, tooth pitch) must conform to
KB0612-02. 050 "Dimensions and Tolerances of Inch Threads".