Which two of the following are the common ways in which threaded fasteners fail during tightening? a. excessive compressive stresses on the head of the fastener due to force applied by the tightening tool
b. excessive compressive stresses on the shank of the fastener
c. excessive shear stresses on the shank of the fastener
d. excessive tensile stresses on the head of the fastener due to force applied by the tightening tool
e. excessive tensile stresses on the shank of the fastener
f. stripping of the internal or external threads