I produced the tubing into plastic composite thread protectors and two forms of pure plastic structure, form the sleeve protector structure for the plastic composite thread protectors, plastic composite structure mainly for export, mainly used for pure plastic structure Domestic 41/2 thread protectors, I thread protectors 31/2 thread protectors complete specifications, beautiful appearance, excellent performance 51/2 thread protectors, products have been widely sold at home and abroad, widely praised by users. The first teeth bear the load of the total load of 30%, so the tool externally threaded joints are prone to fatigue fracture in here. So reducing the thread load LET region has become an important way to extend the tool externally threaded joint fatigue life. Accordingly, the Institute for Development of the oil pipe drill a high fatigue strength --LETR male connector male connector. This connector thread engagement area last (LET) of the first thread teeth bear the load decreased about 25%, the load distribution on each ring of the thread evenly than conventional connectors. Its structure is characterized by reduced thread engagement last Jiangxi thread protectors | 31/2 thread protectors | n Tong Machinery (certified merchants) are provided by Ning County is Tong Machinery Plastic Co., Ltd. Ning County is Tong Machinery Plastic Co., Ltd. (www.dzztjx.com) is specialized in "Fuk Loi wheel, omni-directional wheel, universal ball, wheel and other two-way," the enterprise, the company adhering to the "honesty, hard service" concept To provide you with the highest quality products and services. Welcome to inquire! Contact: song manager.