Studbolts in the gas and oil petrol and chemical industry are used for flange connections. Stud Bolts are a threaded rod with 2 heavy hexagon nuts, while the Hex Bolt has a head with one nut. Nuts and head are both six-sided hexagons.
Studbolt information
ASTM 193 A193M
GAS AND OIL INDUSTRY FASTENERS STUD BOLTS
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