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Asia Bolts & Nuts (MFG) Sdn.Bhd. |
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Terminology on topics related to; The torque necessary to put into reverse rotation a bolt that has not been tightened. |
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BREAKLOOSE TORQUE The torque required to effect reverse rotation when a pre-stressed threaded assembly is loosened. BRITISH STANDARD BRASS BSF |
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BSW - British Standard Whitworth. A thread form developed by Sir Joseph Whitworth in 1841. The thread form has rounded roots and crests, the thread form is specified in BS 84: 1956. This thread form was superceded by the Unified thread in 1948 and then the metric thread form. THREAD HEIGHT - This is the distance between the minor and major diameters of the thread measured radially. THREAD LENGTH - Length the portion of the fastener with threads. THREAD ROOT - The thread root is the bottom of the thread, on external threads the roots are usually rounded so that fatigue performance is improved. THREAD RUNOUT - The portion at the end of a threaded shank which is not cut or rolled to full depth, but which provides a transition between full depth threads and the fastener shank or head. THREADLOCKER - Can be a term used for a number of vibration resistant products but is now usually reserved for threadlocking adhesives. Specifically, a liquid anaerobic adhesive applied to nut or bolt thread, once hardened it fills the inner spaces between the threads to produce a solid plastic of a known shear strength. TIN/ZINC ALLOY ELECTROPLATING - Tin/zinc alloy coatings (typically 70% tin and 30% zinc) are applied to threaded fasteners to provide a corrosion resistant coating. One of the advantages of such coatings is that bimetallic corrosion will not occur when placed into contact with such metals as aluminium or steel. |
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