ABSTRACT
Example: Determine the required 6H thread engagement in 310 aluminum for a 10.9 metric strength level M10 X 1.5-6g bolt. The maximum bolt strength for a 10.9 metric strength level bolt may be taken as the nominal strength of a 12.9 metric strength level bolt, 1200 MPa. The tensile stress area of the threads is 58 mm2 • The maximum bolt load is 1200 X 58 or 69,600 N. The ultimate shear strength of the aluminum is 130 MPa. Tabulated thread specifications show DsMrN = 9.968 mm and ENMAX = 9.206 mm. Substituting 69,600 for FsTRIP in Eq. (23) and using the data provided here leads to LENGAGEo = 21.6 mm.
