A 14-20 Grade 8 Bolt and Nut is used in a non-permanent connection to clamp two 1.000 inch thick Aluminum plates together. The Modulus of Elasticity of the aluminum plates is E = 10.2 E6 psi and the Modulus of elasticity of steel fastener is E = 30 E6 psi. Going through the preliminary calculations, it has been found that a suitable bolt length is 2.250 inches of which the threaded portion is 0.750 inch Given the data provided, find: The bolt Stiffness (spring constant) The material stiffness (spring constant)