Thread Calculations - Polycrew.com

Caution: All information in Polycrew Articles is advisory only and the use of this information is voluntary. Polycrew has made a determined effort to present the contents accurately. Document ID: 2016110601 Date: 1/8/2017 p. 1 of 2 Thread Calculations 1. These equations originate from ASME and ISO specifications for inch and metric threads, respectively, as well as materials and mechanical engineering concepts. Inch Threads Metric Threads References ASME ISO 68-1 ISO 724 ISO 898-1 Tensile stress area of threads, As = 2= 4 ( )2= 4( 2+ 32)2 1= 118 2= 34 3= 1 8= 3 34 1 = 32 = 32 1 = 4( 9 316 1 )2 d1 = minor diameter of external Thread d2 = pitch diameter of external Thread d3 = minor diameter of external Thread H = height of fundamental triangle d = nominal diameter of fastener, in n = threads per inch, in As = tensile stress area of threads, in = 2= 4 ( )2= 4( 2+ 32)2 1= 54 2= 34 3= 1 6= 17 324 =

Thread Calculations 1. These equations originate from ASME and ISO specifications for inch and metric threads, respectively, as well as materials and mechanical engineering concepts. Inch Threads Metric Threads References ASME B1.1 ISO 68 -1 ISO 724 ... bolt due to applied

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