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PowerCoil 3532-1/2X1.5DP UNC 1/2 x 13 x 1.5D Wire Thread Inserts 10 Pack - -. Used to repair damaged or worn out threads, they can also be used to create new stronger threads in original equipment. 。 Provide a permanent, corrosion and wear resistant internal thread which is usually stronger than the original parent material thread. 。 PowerCoil wire thread inserts are manufactured from precision profiled diamond shaped stainless steel wire and formed into a helical spiral. 。 Available in free running (mimics a standard thread) or in thread locking (preventing bolts from vibrating loose). 。 Manufactured from high quality chromium nickel stainless steel, Wire Thread Inserts provide high strength internal threads that resist the effects of temperature and corrosion. Their unique design ensures superior threads whose compound performance cannot be reproduced by any other single fastening method. Available in two basic forms, free running or screw locking, they are much lighter and less expensive than any other equivalent type of thread insert and because of their compact size they can generally be incorporated into existing designs where no previous provision has been made. Free Running Produced from precision profiled austenitic stainless steel wire wound into a helical spiral, free running inserts have a spring like appearance. When installed, using any one of a variety of manual or automatic tools, they provide strong permanent internal threads which resist heat and corrosion. Once fitted, their position is maintained by the action of radial pressure between their coils and the flanks of the tapped hole. This pressure exists because their free diameter is larger by a calculated amount, than their installed diameter. Screw Locking Screw locking (or prevailing torque) inserts are of particular value in applications subject to the effects of cyclic vibration or impact. In addition to the benefits afforded by free running inserts, screw locking inserts offer the additional security of prevailing locking torque. This is achieved by the action of one or more polygonal grip coils positioned within the inserts l ength, which exert radial pressure on the male thread. Each grip coil consists of a number of tangential locking chords which protrude inside the minor diameter of the normal free running coils. As the male thread passes through these grip coils, the locking flats are displaced thus exerting radial pressure or prevailing torque on the male thread. On removal of the male thread, the locking coils relax to their original form permitting repeated assembly whilst retaining a measurable level of prevailing torque. Note: It is recommended that only close fit plated or lubricated bolts or screws are used with screw locking inserts. 。 。 。