1.1 ,This specification covers one style of heat treated, alloy steel, tension control bolt-nut-washer assemblies, also referred to as “,sets,”, having a tensile strength of 200 to 215 ksi. These assemblies are capable of developing a minimum predetermined tension when installed by applying torque to the nut, while at the same time applying a counter torque to separate the spline end from the body of the bolt using an appropriate spline drive installation tool.