Stud Bolts

Petrosadid: Stud Bolts

PETROSADID prides itself on providing Standard and Custom Engineered Stud-Bolts to match our customer’s needs.

In Petro and chemical industry for flange connections Stud Bolts and Hex Bolts are used. The Stud Bolt is 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.

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The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange, diameter and length of bolts is dependent of flange type and Pressure Class of flange.

Stud Bolt length are defined in ASME B16.5 standard. The length in inches is equal to the effective thread length measured parallel to the axis, from the first to the first thread without the chamfers (points). First thread is defined as the intersection of the major diameter of the thread with the base of the point.




Stud Bolt Specification & Standard

Various ASME standards are used for stud bolts and nuts to manufacturing bolting material. List of such standard is given below.

• Diameter and Lengths of the stud and bolt are covered in ASME B16.5 & B16.47

• ASME B1.1 Unified Inch Screw Threads (Cores and Fine thread series- normally Cores thread series is used for stud used in piping)

• ASME B18.2.1 for Square and Hex Bolts and Screws

• ASME B18.2.2 Square and Hex Nuts

• ASME B18.21.1 Lock Washers

• ASME B18.22.1 Plain Washers

Grades of Stud Bolts

Below a table with materials and grades for flanges, thread rods (bolts) and nuts, arranged on design temperature, flanges, thread rods and recommended nuts.



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