What is the equation used to calculate required fastener torque as a function of desired preload and bolt size? Calculate the tightening torques for the following fasteners: a grade 5,- 20 fastener, a grade 8, 7-20 fastener and a grade 8, %-28 fastener. Explain how fastener grade and TPI afect the required preload. equation: Grade 8 -28 Grade 8-1-20 Oy 0 0 Grade 5.7.-20 0,85,000 psi 01 - 76,500 psi 4,-0.0318 in F - 2,433 IL T=122 Ib-in= 10.2 lb-ft F- T- F = T= trends
