Double end Stud bolt are threaded rods, with equal thread length at both ends. Tap end studs are als0 sometimes referred as double end stud bolts. Double end Stud bolts have plain shank equal to that of the nominal diameter.
Whereas double Stud bolt are used for high strength bolting. Further one type of double end stud bolts have reduced shank diameter as designed for special bolting. DIN 2510 is specification for double end stud bolts with reduced shank. They are defined in both metric and imperial sizes with unified coarse pitch (UNC), fine pitch (UNF), fixed pitch (UN) and iso metric thread profile. These are produced across all material categories and astm specifications.
In Fact Stud Bolts are externally threaded fasteners without a head, used with 2 nuts on either side, substituting a usual “bolt & nut” assembly. Stud bolts are prominently used in flange connections. Bolts are usually defined as a threaded fastener intended to be mated with a nut, while a screw can engage either preformed or self-made internal threads. … A stud is an externally threaded headless fastener. One end usually mates with a tapped component and the other with a standard nut.
Furthermore Grade B7. ASTM A193 Grade B7 bolts and threaded studs are manufactured from a chromium-molybdenum steel and are quenched and tempered (heat treated) to develop the desired mechanical properties (strength). Grade B7 is the most common grade of A193 bolts used in construction.