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Products > Studs & Nuts > Heavy Hex Nuts

Heavy Hex Nuts – Comprehensive Overview

Heavy Hex Nuts are robust fastening components designed for critical bolting applications where strength, durability, and resistance to extreme conditions are essential. Manufactured to ASTM A194 specifications and conforming to ASME B18.2.2 dimensional standards, these nuts are widely used in industries that demand reliability under high pressure, high temperature, and corrosive environments.

Material Grades & Properties

  • Carbon Steel Grades:
    • Grade 2H / 2HM: Ideal for high-pressure and high-temperature service. Heat-treated for enhanced strength and toughness.
  • Alloy Steel Grades:
    • Grade 4, 7L, 7LM: Designed for elevated temperature applications and improved mechanical properties.
  • Stainless Steel Grades:
    • Grade 8 / 8M: Offers superior corrosion resistance, making them suitable for harsh chemical and marine environments.

Each grade undergoes precise heat treatment and rigorous testing to ensure:

  • Consistent hardness and tensile strength
  • Resistance to stress corrosion cracking
  • Compliance with ASTM and ASME standards

Finishes & Coatings

Available in multiple finishes to suit specific environmental and operational needs:

  • Plain (uncoated): Standard for general applications
  • Zinc-plated: Provides basic corrosion protection
  • Cadmium-plated: Enhanced corrosion resistance for aerospace and defense
  • PTFE-coated: Low friction and excellent chemical resistance for aggressive environments

Sizes & Compatibility

  • Sizes range from ¼” to 4” (including metric equivalents)
  • Fully compatible with ASTM A193 stud bolts
  • Complete Material Test Reports (MTRs) for traceability and certification

Key Features

  • Meets ASTM A194 / ASME B18.2.2 requirements
  • Suitable for high-temperature and high-pressure bolting
  • Material traceability ensures compliance with project specifications

Common Applications

  • Pressure vessels and valves
  • Flange bolting assemblies
  • Refineries and chemical plants
  • Power generation systems
  • Pipeline and petrochemical installations

Why Choose Heavy Hex Nuts?

Their larger size compared to standard hex nuts provides:

  • Greater bearing surface for load distribution
  • Increased strength for demanding bolting connections
  • Reliability in critical service conditions


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