ASME B18.2.2 Hex Nuts | Inch Series Heavy Hex and Finished Nuts | GFM-WCR System
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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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.
- 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.
| Nut Type | Common Application |
|---|---|
| Finished Hex | Standard Machinery & General Use |
| Heavy Hex | Structural Steel & Flange Connections |
| Hex Jam | Locking (Double Nutting) & Low Profile |
| Material Property | SAE J995 Grade 2, 5, 8 / ASTM A563 |
| Common Sizes | 1/4" – 4" (Stocked Sizes) |
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