Comments on: Bespoke Nuts http://www.ret-monitor.com/articles/791/bespoke-nuts/ Specific mission-critical info for professionals Mon, 21 May 2012 22:34:31 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Terry http://www.ret-monitor.com/articles/791/bespoke-nuts/comment-page-1/#comment-5870 Terry Sun, 09 Jan 2011 06:05:51 +0000 http://www.ret-monitor.com/articles/791/bespoke-nuts/#comment-5870 The stress concentrations in a screw thread are usually mitigated by reducing the diameter of the bolt/stud body and carefully blending the cross section transitions to the thread and bolt head. Making the parts less stiff with a more diffuse stress distribution is the key to improving fatigue life. As for the length of thread engagements, with similar materials in both parts, 5 or 6 thread pitches are usually adequate to achieve full tensile strength. Thread engagements equal to more than 1.0 diameter are not normally used due to interferences caused by thread pitch error accumulations. The stress concentrations in a screw thread are usually mitigated by reducing the diameter of the bolt/stud body and carefully blending the cross section transitions to the thread and bolt head. Making the parts less stiff with a more diffuse stress distribution is the key to improving fatigue life.

As for the length of thread engagements, with similar materials in both parts, 5 or 6 thread pitches are usually adequate to achieve full tensile strength. Thread engagements equal to more than 1.0 diameter are not normally used due to interferences caused by thread pitch error accumulations.

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