Tensile Strength for a Bolt is determined by applying a Force along it long axis. Shear Strength for a Bolt is determined by applying a Force across its diameter, as it would be loaded in a lug joint.
Tensile strength of a material represents its strength to fail against tensile load i.e. the load applied axially outwards while shear strength represents its strength against sliding of two cross sections when tangentially force is applied
tensile strength is the maximum stress that a material can withstand while being stretched .......Shear strength describe the strength of a material or component against the type of yield or structural failure where the material or component fails in shear.
tensile strength is defined as a maximum stretching capacity of a material up to this tensile strength the material can withstand it's tensile properties then after the material get in to a yield stage then after it get's failed due to excessive loading............... but when shear strength is concern,the ability of a material to withstand against the large tangential forces or drag forces acts on it. due to the shear failure the material fails in inappropriate manner.......so finally we can say the material ability to stand against the tangential or drag forces in a structure........