ASME VIII, Div1 UG-43 Thread Engagement

[wsmith22]

Is it correct that the minimum thread engagement per UG-43 usually less than the 1.5 * nominal bolt diameter that is recommended in other threads.

 

[metengr]

You need to perform the calculation. In reviewing ASME Section VIII, Div 1 Part UG-43, specifically paragraph (g), regarding tapped holes for studs; the threads shall be engaged based on stud length not less than the larger of

the diameter of the stud d(s), OR

0.75d(s) x (max allowable stress of stud at temperature)/
(max allowable stress value of tapped material at temp)

the thread engagement shall not exceed 1.5 x d(s)