This product is made from Japan DC53 steel with a Rockwell hardness of 58–60 HRC, and complies with IEC 60061-3 standards. It is designed for quality inspection of E27 screw-type lamp caps. The structure and thread profiles (such as thread waveforms) are computer-calculated and optimized, then precision-machined using CNC equipment, resulting in high accuracy and a refined appearance. The material is a high-grade cemented carbide with excellent rust resistance for long-lasting durability.
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