ANSI/ASME B18.2.2 Hex Nuts
ANSI/ASME B18.2.2 Hex Nuts are standardized inch-series nuts designed for consistent fit with compatible bolts, screws, and studs. The six-sided profile provides convenient wrench or socket access, while standardized dimensions support interchangeability across commonly used inch fasteners. Thread size and series, such as UNC or UNF, should be matched with the mating fastener to ensure proper engagement.
Hex Nuts can be supplied in different strength grades and materials, including SAE J995 Grade 2, Grade 5, and Grade 8, as well as stainless steel options for applications where corrosion resistance is important. Material and strength grade should be selected according to the load requirements and matched appropriately with the bolt or stud. Available in a wide range of inch sizes, materials, grades, and finishes, B18.2.2 Hex Nuts can be used across machinery, equipment, fabricated structures, mounting assemblies, and general maintenance applications where standardized inch-series fastening is required.
Specification:
ANSI/ASME B18.2.2 defines the dimensional requirements for inch-series Hex Nuts, including nut width, thickness, thread dimensions, and applicable size ranges. The nut should be selected according to the matching bolt or stud size and thread series, such as UNC or UNF, to ensure proper thread engagement and fit.
Mechanical requirements depend on the selected material and grade. Carbon and alloy steel Hex Nuts can be supplied to SAE J995 Grade 2, Grade 5, or Grade 8 requirements, while stainless steel versions can be specified to ASTM F594. Stainless steel options include commonly used 304/304L and 316/316L grades, where applicable. Strength grade, material, and finish should be selected according to the load and service environment.
| Item | Specification |
|---|---|
| Standard | ANSI/ASME B18.2.2 |
| Product Type | Hex Nut |
| Thread System | Inch |
| Thread Series | UNC/UNF |
| Thread Class | 2B |
| Size Range | 1/4"-4" |
| Steel Standard | SAE J995 |
| Stainless Steel Standard | ASEM F594 |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Surface treatment | Black Oxidation,Zinc Plated,Hot Dip Galvanized, |
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Dimension Chart of ANSI/ASME B18.2.2 Hex Nuts:
The dimension chart provides the key dimensions needed to select and verify an inch-series Hex Nut. Nominal size and thread series should first be matched with the mating bolt or stud, while width across flats and nut thickness are important for wrench clearance and available installation space. The dimensions below follow the applicable requirements of ANSI/ASME B18.2.2.
| Mon | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 | 1-5/8 | 1-3/4 | 1-7/8 | 2 | 2-1/4 | 2-1/2 | 2-3/4 | 3 |
| P | 20|28|32 | 18|24|32 | 16|24|32 | 14|20|28 | 13|20|28 | 12|18|24 | 11|18|24 | 10|16|20 | 9|14|20 | 8|12|20 | 7|12|18 | 7|12|18 | 6|12|18 | 6|12|18 | 6|12|18 | 5|8|12 | 6 | 4.5 | 4.5 | 4 | 4 | 4 |
| s min | 0.428 | 0.489 | 0.551 | 0.675 | 0.736 | 0.861 | 0.922 | 1.088 | 1.269 | 1.45 | 1.631 | 1.812 | 1.994 | 2.175 | 2.35 | 2.538 | 2.722 | 2.9 | 3.263 | 3.625 | 3.988 | 4.35 |
| s max | 0.438 | 0.5 | 0.563 | 0.688 | 0.75 | 0.875 | 0.938 | 1.125 | 1.312 | 1.5 | 1.688 | 1.875 | 2.062 | 2.25 | 2.43 | 2.625 | 2.813 | 3 | 3.375 | 3.75 | 4.125 | 4.5 |
| e min | 0.488 | 0.557 | 0.628 | 0.768 | 0.84 | 0.982 | 1.051 | 1.24 | 1.447 | 1.653 | 1.859 | 2.066 | 2.273 | 2.48 | 2.679 | 2.893 | 3.103 | 3.306 | 3.719 | 4.133 | 4.546 | 4.959 |
| e max | 0.505 | 0.577 | 0.65 | 0.794 | 0.866 | 1.01 | 1.083 | 1.299 | 1.516 | 1.732 | 1.949 | 2.165 | 2.382 | 2.598 | 2.805 | 3.031 | 3.247 | 3.464 | 3.897 | 4.33 | 4.763 | 5.196 |
| k min | 0.212 | 0.258 | 0.32 | 0.365 | 0.427 | 0.473 | 0.535 | 0.617 | 0.724 | 0.831 | 0.939 | 1.03 | 1.138 | 1.245 | 1.364 | 1.46 | 1.567 | 1.675 | 1.89 | 2.105 | 2.319 | 2.534 |
| k max | 0.226 | 0.273 | 0.337 | 0.385 | 0.448 | 0.496 | 0.559 | 0.665 | 0.776 | 0.887 | 0.999 | 1.094 | 1.206 | 1.317 | 1.416 | 1.54 | 1.651 | 1.763 | 1.986 | 2.209 | 2.431 | 2.654 |
Application of ANSI/ASME B18.2.2 Hex Nuts:
Machinery & Equipment Assembly
B18.2.2 Hex Nuts are widely used for assembling machine components, equipment frames, pumps, conveyors, mounting brackets, and mechanical housings. Their standardized inch threads and six-sided profile provide convenient wrench or socket access for installation and tightening.
Structural & Fabricated Assemblies
These Hex Nuts are suitable for steel frames, supports, mounting structures, guards, platforms, and fabricated metal assemblies using compatible inch-series bolts or studs. Grade 5 and Grade 8 options can be selected for connections requiring higher mechanical strength, subject to the applicable requirements.
Mounting & Component Connections
Hex Nuts are commonly used to secure motors, equipment bases, panels, brackets, supports, and other mounted components where a conventional threaded connection is required. Different materials, strength grades, and finishes allow the nut to be matched to the fastener and service environment.