Thread form should prevent the external and internal threads bonding material plastic thread protectors, should be sufficient to ensure that the use of features thread contact. There should be no metal-to-metal contact thread protectors on the thread type connector, and the radial sealing surface of steel should not have contact with metal to metal or plastic to metal. High-quality, full range, affordable oil casing thread protectors | Features and Benefits plastic (QS) oil casing thread protectors Swiss nameplate thread protectors: the surface is smooth, no cracks, no dents, seismic, not thread would cause corrosion, which is not falling after the installation, safety, threaded end and high end of the coupling strength will not damage the thread, no distortion, no corrosion thread, thread geometry consistency 41/2 protection, in full compliance with SY / T5991-94 industry standards. Smooth surface thread no broken buckle, no impurities, no fall, no bond with steel threads for -46 degrees to 66 degrees storage conditions than one year. Positive Tong machinery (Figure) _ Texas thread protectors _ Xingyi thread protectors provided by Ning County is Tong Machinery Plastic Co., Ltd. Ning County is Tong Machinery Plastic Co., Ltd. (www.dzztjx.com) adhere to the "people-oriented" business philosophy, with a professional staff, and strive to provide the best products and services to contribute to society, and to welcome new and old customers to visit patrons, sincere cooperation for a better future. N Tong Machinery - your trusted friend Address: Galaxy Ningjin County Economic Development Zone, Contact: Qu manager.