Stud Bolt

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Stud Bolt

Stud bolts are externally threaded fasteners manufactured without a head, designed for assembly with two heavy hex nuts to achieve uniform load distribution and high clamping force. They are primarily used in bolted flange joints and critical pressure-retaining applications where joint integrity, preload accuracy, and ease of maintenance are essential.

Stud bolts provide superior performance under high-pressure and high-temperature conditions, ensuring reliable sealing and minimizing the risk of leakage in demanding service environments.

Configuration Types
  • Continuous Thread (All-Thread Studs): Fully threaded along the entire length for maximum engagement
  • Double-End Studs: Threads on both ends with a defined unthreaded shank (if required)
  • Tap-End Studs: One end shorter for threaded hole applications

Applicable Codes & Standards

Dimensional Requirements:
  • ASME B18.31.2 – Stud Bolts and Threaded Rods
  • ASME B16.5 / B16.47 – Flange bolting requirements
  • DIN 976 / ISO 898-1 – Metric standards
Material Specifications:
  • ASTM A193 – High temperature/pressure bolting (B7, B7M, B8, B8M, B16)
  • ASTM A320 – Low temperature service (L7, L7M)
Material Grades (Commonly Used)

High Tensile, Stainless Steel, Alloy Steel, Inconel, Incoloy, Hastelloy, Monel, Silicon Bronze, Phosphor Bronze, Aluminium Bronze, Nickel, Brass, Copper, Copper Nickel,Duplex, Super Duplex, Titanium Alloys, CB20, Nitronic, Nimonic, ASME, ASTM etc…

Typical Parameters
  • Diameter Range: ⅛” to 6” (M3 to M160)
  • Thread Series: UNC / UNF / 8UN / Metric (Coarse & Fine)
  • Length Tolerance: As per ASME standards or project specification
  • Mechanical Properties:As per ASTM material grade requirements
  • Heat Treatment: Quenched & tempered / solution annealed (as applicable)
Surface Finish / Coating:
  • PTFE Coated Stud Bolts (Blue, Yellow, Red, Green & Black)
  • Hot Dip Galvanized
  • Yellow Zinc Plated
  • Blue Zinc Plated
  • Molykote
  • Aluminium Zinc Flake Coated
  • Black Phosphate
  • Zinc Plated
  • Nickel Plated
Engineering Applications

Stud bolts are extensively used in:

  • High-pressure flange joints
  • Pressure vessels and heat exchangers
  • Valves, pumps, and piping systems
  • Offshore and subsea equipment
  • Oil & Gas, petrochemical, and power generation industries
Key Performance Features
  • Uniform preload distribution across flange joints
  • High tensile strength and fatigue resistance
  • Excellent performance under cyclic loading conditions
  • Ease of installation, removal, and maintenance
  • Suitable for extreme temperature and corrosive environments