By Alexander Blake
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Extra info for What every engineer should know about threaded fasteners: materials and design
The highest stress concentrations in threads occur at the roots and the magnitude of the stress concentration factor relates directly to whether the root is rounded and to what degree. Research has additionally demonstrated that this potential applies to all fastener strength levels. In a properly designed bolt/nut combination the nut is the stronger member of the team with the intent that should failure occur it will invariably be the externally threaded member. Page 19 4 Comparison of Thread Series Thread series are groups of diameter/pitch combinations differing from each other by the number of threads per inch (or thread pitch) applied to a series of diameters.
The 8thread series (8UN) commands an equal popularity with coarse threads. ISO metric fine threads have pitches considerably finer than the Unifed fine series and use of this thread series for metric fasteners is not recommended. Page 22 This page intentionally left blank. Classes of fit are specific combinations of tolerances and allowances as applied to external and internal threads. Using these definitions class 1A/1B represents the loosest fit covered in screw thread standards while class 3A/3B is the tightest of the clearance fits.
The bolt threads will strip off (infrequent failure mode) when the nut material is much stronger than that of the bolt and when the length of engaged threads is less than about 60% of the nominal bolt diameter; and 3. the nut threads will strip out when the bolt material is appreciably stronger than that of the nut and there is an inadequate length of thread engagement. This is particularly important because recent trends have been to tension the bolts to progressively higher levels, frequently and intentionally beyond their yield strengths, in order to optimize the use of strength properties of the fastener, to enhance the fatigue behaviour of the joint, and to reduce any tendency of the fastener to loosen under service loads.
What every engineer should know about threaded fasteners: materials and design by Alexander Blake