There are no published values for bolt shear strength. The Industrial Fastener Institute says that a bolt's shear strength is equal to approximately 60 percent of its tensile strength.
A bolt's shear capacity is dependant on a number of factors, including the bolt grade, diameter, whether or not the bolt threads are within the shear plane, and whether or not there are any tension forces acting on the bolt at the same time. Section 7 of the "Steel Construction Manual" by the American Institute of Steel Construction provides details for how to calculate the shear capacity of structural bolts. For any structural design applications, it is best to have a licensed structural engineer evaluate the bolting requirements to make sure that all applicable building codes and standards are properly followed.