Thread form should prevent the external and internal threads bonded material of good quality thread protectors, should be sufficient to ensure that the use of features thread contact. There should be no metal-to-metal contact, and with the radial sealing surface of steel should not have contact with metal to metal or plastic to metal on the connector thread profile. Thread protectors in the form of complex steel structure, composite plastic structures or plastic structures. Positive Tong Machinery (FIG), Shenzhen thread protectors manufacturer, thread protectors provided by Ning County is Tong Machinery Plastic Co., Ltd. Ning County is Tong Machinery Plastic Co., Ltd. (www.dzztjx.com) Ning County Economic Development Zone is located in the Milky Way. Scraps and development in the wave of market economy, now has a high profile Tong machine in the plastic, and enjoy a good reputation. Tong machinery made positive the whole network business alliance certification, marking our service and management level has reached a new height. Positive Tong mechanical staff willing to work with all people of insight and common development, for a better future.