ASME B18.2.2 Hex Nuts | Inch Series Heavy Hex and Finished Nuts | GFM-WCR System

ASME B18.2.2 Hex Nuts | Inch Series Heavy Hex and Finished Nuts | GFM-WCR System


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ASME B18.2.2 Square and Hex Nuts | Inch Series | Standard, Heavy, and Jam Nuts | LONGZE


ASME B18.2.2 is the primary North American standard for Inch Series Nuts. It encompasses a comprehensive range of square and hexagon nuts, including specialized variations such as Hex Jam Nuts, Heavy Hex Nuts, and Slotted Nuts. This standard is designed to work seamlessly with the unified thread series (UNC/UNF) commonly used in the United States and Canada.

Whether for structural steelwork using Heavy Hex configurations or general mechanical assembly with standard Hex styles, ASME B18.2.2 ensures precise dimensional consistency and high-load performance across all industrial sectors.

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Engineering Principle


The mechanical focus of ASME B18.2.2 is clamping load distribution. For example, Heavy Hex Nuts are designed with a larger width across flats (WAF) to provide a greater bearing surface, which is critical when used with structural bolts like ASTM A325 or A490. Jam Nuts, being thinner, are utilized either as a secondary locking nut or in space-constrained applications where full axial load capacity is not required.

Engineering Note: It is crucial to match the nut's property class (e.g., Grade 2, 5, or 8) with the corresponding bolt grade to prevent thread stripping. Heavy Hex Nuts under ASME B18.2.2 are the mandatory standard for structural and high-pressure piping assemblies.
Standards System Integration


Standard Definition:
  • ASME B18.2.2 = Square and Hex Nuts (Inch Series)
  • Key Styles: Hex, Heavy Hex, Hex Jam, Heavy Hex Jam, Square.
  • Thread Standards: Unified Inch Screw Threads (UNC, UNF, 8UN).
  • System Context: The American counterpart to the metric ISO 4032 or DIN 934 systems.
Cross Standard Equivalents


Recommended Assembly Pairings


Systematic Integration: ASME B18.2.2 nuts are designed for precision fit with ASME B18.2.1 Inch Bolts. For structural applications, they are typically paired with F436 washers.
Technical Specifications


Nut TypeCommon Application
Finished HexStandard Machinery & General Use
Heavy HexStructural Steel & Flange Connections
Hex JamLocking (Double Nutting) & Low Profile
Material PropertySAE J995 Grade 2, 5, 8 / ASTM A563
Common Sizes1/4" – 4" (Stocked Sizes)
Production & Export


LONGZE Fasteners produces full-range ASME B18.2.2 nuts in our Yongnian facility, adhering to strict IFI (Industrial Fasteners Institute) standards. We support bulk exports for infrastructure and oil & gas projects in the Americas and Middle East, providing verified property class certification and various surface treatments.
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