ASME B16.5 is primarily the dimensional standard for ASTM Stud bolts. This defines the Dimensional requirement primarily i.e. length and the diameter of stud Bolt to be used for the tightening of flange guards.Whereas ASME B1.1 defines the threading requirements. Most commonly used thread form is the symmetrical V profile thread with 60 degree angle.The most common grade that we work with is ASTM A 193.