ASME/ANSI B18.2.2 Hex Flange Nuts
ASME/ANSI B18.2.2 Hex Flange Nuts combine a standard hexagonal nut with an integral flange that extends the bearing surface beneath the nut. The wider flange provides increased contact with the mating component and can help distribute clamping pressure over a larger area than a conventional hex nut.
Designed for inch-series bolted connections, these nuts are available with compatible UNC and UNF threads. The hex body provides conventional wrench or socket access, while the integral flange remains part of the nut during installation, eliminating the need to handle a separate washer where the joint design allows the flange to provide the required bearing function. The flange geometry, thread size, and hex dimensions can be selected according to the requirements of the fastening assembly, making the nut suitable for both new equipment and replacement of existing inch-standard fasteners.
Specification:
ASME/ANSI B18.2.2 specifies the dimensional requirements and general data for inch-series nuts, including hex flange configurations. Product selection should consider the nominal thread size, thread series, nut dimensions, and flange dimensions to ensure compatibility with the mating bolt and available installation space. Carbon and alloy steel nuts can be specified according to ASTM A563 or SAE J995, depending on the required material and mechanical grade. Stainless steel versions can be supplied according to ASTM F594 with the appropriate alloy and property requirements.
| Item | Specification |
|---|---|
| Product Standard | ASME/ANSI B 18.2.2 |
| Product Type | Hex Flange Nut |
| Nut Style | Hexgaon Nut with Integral Flange |
| Thread System | Inch |
| Thread Pitch | UNC/UNF |
| Diameter | #6-3/4” |
| Mechanical Property | ASTM F 594,SAE J 995 |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Surface Treatment | Zinc Plated, Black Oxidation, Dacromet,Bright Finish |
Dimension Chart of ASME/ANSI B18.2.2 Hex Flange Nuts:
The ASME/ANSI B18.2.2 dimension chart provides the key measurements required to select and verify an inch-series Hex Flange Nut. In addition to the nominal thread size and thread series, the chart covers the nut’s width across flats, nut height, and integral flange diameter, allowing the nut to be checked against the mating bolt and the available space around the fastening point. For replacement or assembly work, the thread series and nominal size should be matched first, followed by the nut height and flange diameter to confirm adequate clearance and bearing area. UNC and UNF options can be selected according to the thread specification of the mating fastener.
| Thread Diameter | #6 | #8 | #10 | #12 | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 |
| P | 32|40 | 32|36 | 24|32 | 24|28 | 20|28|32 | 18|24|32 | 16|24|32 | 14|20|28 | 13|20|28 | 12|18|24 | 11|18|24 | 10|16|20 |
| s min | 0.302 | 0.334 | 0.365 | 0.428 | 0.428 | 0.489 | 0.551 | 0.675 | 0.736 | 0.861 | 0.922 | 1.088 |
| s max | 0.312 | 0.344 | 0.375 | 0.438 | 0.438 | 0.5 | 0.562 | 0.688 | 0.75 | 0.875 | 0.938 | 1.125 |
| e min | 0.342 | 0.381 | 0.416 | 0.488 | 0.488 | 0.557 | 0.628 | 0.768 | 0.84 | 0.982 | 1.051 | 1.24 |
| e max | 0.361 | 0.397 | 0.433 | 0.505 | 0.505 | 0.577 | 0.65 | 0.794 | 0.866 | 1.01 | 1.083 | 1.299 |
| dc min | 0.406 | 0.452 | 0.48 | 0.574 | 0.574 | 0.66 | 0.728 | 0.91 | 1 | 1.155 | 1.248 | 1.46 |
| dc max | 0.422 | 0.469 | 0.5 | 0.594 | 0.594 | 0.68 | 0.75 | 0.937 | 1.031 | 1.188 | 1.281 | 1.5 |
| k min | 0.156 | 0.187 | 0.203 | 0.222 | 0.222 | 0.268 | 0.33 | 0.375 | 0.437 | 0.483 | 0.515 | 0.627 |
| k max | 0.171 | 0.203 | 0.219 | 0.236 | 0.236 | 0.283 | 0.347 | 0.395 | 0.458 | 0.506 | 0.569 | 0.675 |
- RELATED NUT LISTS:
- DIN6334 Hexagon Coupling Nuts
- ASME/ANSI B 18.2.2 Hex Slotted Nuts/Castle Nuts
- IFI145 Flange Nuts
- DIN982 Nylon Lock Nuts
- DIN985 Nylon Lock Nuts
- ASME B 18.16.6 Nylon Nuts
- JIS 1186 Hex Nuts
- DIN934 Hex Nuts
- A194 Hex Nuts
- A563 Hex Nuts
- DIN6915 Hex Nuts
- GOST 5915 Hex Nut
- UNI5588 Hex Nuts
- UNI5587 Thick Hex Nuts
- AS1112.1 Hex Nuts
- AS1252 Hex Nuts
- DIN6330 Hex Thick Nuts
- ASME/ANSI B 18.2.2 Hex Thick Nuts
Application of ASME/ANSI B18.2.2 Hex Flange Nuts:
Engines and Powertrain Equipment
Hex Flange Nuts can be used on engine mounts, brackets, accessory assemblies, and equipment mounting points where inch-series threaded fasteners are specified. The integral flange provides the bearing surface directly beneath the nut, which is useful where the joint has limited space for a separate washer.
Pumps, Compressors and Generator Sets
These nuts are suitable for pump bases, compressor housings, motor mounts, generator frames, and serviceable equipment assemblies using UNC or UNF threaded connections. The flange provides a defined seating surface while the hex body allows standard wrench or socket access.
Agricultural and Off-Road Equipment
Common applications include tractors, harvesters, loaders, excavators, trailers, and other off-road equipment designed around inch-standard fasteners. The appropriate nut material and mechanical grade can be selected according to the loads and service conditions of the connection.