ASME/ANSI B 18.2.2 Hex Thick Nuts
ASME/ANSI B18.2.2 Hex Thick Nuts are designed with a greater nut thickness than standard hex nuts, providing additional threaded engagement within the same basic hexagonal nut configuration. The increased height gives the internal threads more contact with the mating bolt or stud, while the hexagonal shape provides six flat surfaces for tightening with a wrench or socket. This combination makes the nut a practical choice for threaded joints where a thicker nut profile is required for the connection design.
The standardized geometry of ASME/ANSI B18.2.2 covers the dimensional relationship between the thread, nut height, and across-flats width, allowing the nut to be matched consistently with compatible inch-series bolts, screws, and studs. Hex thick nuts can be supplied in different materials and grades according to the required load, temperature, corrosion resistance, and service conditions, making them suitable for structural connections, mechanical assemblies, equipment fabrication, and other applications requiring a robust threaded fastening arrangement.
Specification:
ASME/ANSI B18.2.2 Hex Thick Nuts are manufactured to standardized dimensional requirements for inch-series hexagonal nuts, including the relationship between thread size, nut thickness, and width across flats. The thicker nut profile provides the required thread length within the nut while maintaining the familiar six-sided configuration for wrench or socket installation. These dimensions allow the nut to be matched with compatible inch-series bolts, screws, and studs.
Material and nut grade can be selected according to the mechanical and service requirements of the fastening system. Carbon and alloy steel versions are suitable for general mechanical and structural applications, while stainless steel options can be used where greater corrosion resistance is required. Depending on the specification and customer requirements, available finishes may include plain, zinc plated, hot-dip galvanized, black oxide, or other protective coatings.
| Item | Specification |
|---|---|
| Standard | ASME/ANSI B18.2.2 |
| Product Type | Hex Thick Nut |
| Thread System | Inch/Unified Thread |
| Thread Series | UNC/UNF |
| Thread Size | Inch Size |
| Diameter | 1/4"-1-1/2" |
| Grade | SAE GR.2.5.8 |
| Drive | External Hexagon |
| Material | Carbon Steel,Alloy Steel,Stainless Steel |
| Surface Treatment | Zinc Plated,Dacromet,Hot Dip Galvanized,Black Oixdation,Bright Pickling,Passivation |
- RELATED NUT LISTS:
- DIN6334 Hexagon Coupling Nuts
- ASME/ANSI B 18.2.2 Hex Slotted Nuts/Castle Nuts
- ASME/ANSI B18.2.2 Hex Flange Nuts
- Lock Nuts
- IFI145 Flange Nuts
- DIN982 Nylon Lock Nuts
- DIN985 Nylon Lock Nuts
- ASME B 18.16.6 Nylon Nuts
- HEX NUT
- JIS 1186 Hex Nuts
- DIN934 Hex Nuts
- A194 Hex Nuts
- A563 Hex Nuts
- DIN6915 Hex Nuts
- GOST 28919 Thick Hex Nuts
- GOST R 52645 Structural Hex Nuts
- GOST 5915 Hex Nut
- UNI5588 Hex Nuts
- UNI5587 Thick Hex Nuts
- UNI5713 Hex Nuts
- AS1112.1 Hex Nuts
- AS1252 Hex Nuts
- AS/NZS 2451 Hex Nuts
- AS/NZS 2465 Hex Nuts
- DIN6330 Hex Thick Nuts
Dimension Chart of ASME B18.2.2 Hex Thick Nuts:
The ASME/ANSI B18.2.2 dimension chart provides the key measurements required to select a Hex Thick Nut for an inch-series threaded connection. The nut dimensions are coordinated with the corresponding thread size, allowing the nut to be matched with compatible bolts, screws, and studs. Because this product has a thicker profile, nut thickness is particularly important when checking available thread engagement and the space available around the assembled joint.
The main dimensions include nominal thread size, width across flats (s), nut thickness (m), and thread specifications. The width across flats determines the required wrench or socket size, while the nut thickness determines the amount of threaded material available inside the nut. Thread size and pitch should also be checked against the mating fastener to ensure correct engagement. The dimensional values should be selected from the applicable ASME/ANSI B18.2.2 size table rather than treating the nut as interchangeable with a standard-thickness hex nut.
| Thread Diameter | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| k min | 0.274 | 0.32 | 0.398 | 0.444 | 0.552 | 0.598 | 0.706 | 0.798 | 0.89 | 0.982 | 1.136 | 1.228 | 1.351 | 1.474 |
| k max | 0.288 | 0.336 | 0.415 | 0.463 | 0.573 | 0.621 | 0.731 | 0.827 | 0.922 | 1.018 | 1.176 | 1.272 | 1.399 | 1.526 |
Application of ASME/ANSI B 18.2.2 Nuts:
Carbon Steel Thick Nuts for General Industrial Connections
Carbon steel Hex Thick Nuts are suitable for general-purpose threaded connections where strength, dimensional consistency, and cost efficiency are important. They can be used in steel fabrication, agricultural machinery, trailers, storage structures, workshop equipment, machinery frames, and general mechanical assemblies. Depending on the specified grade and service requirements, carbon steel nuts may be supplied in different mechanical property levels to match the corresponding bolts or studs.
Heat-Treated Alloy Steel Nuts for High-Load Connections
Alloy steel is commonly selected when the fastening joint requires higher mechanical performance than a standard carbon steel nut can provide. For certain high-strength alloy steel nut grades, heat treatment such as quenching and tempering may be required to achieve the specified hardness and mechanical properties. These nuts can be used with matching high-strength fasteners in heavy machinery, hydraulic equipment, mining equipment, lifting systems, power-transmission assemblies, and heavily loaded structural connections.
The heat-treatment condition is an important part of the specification for these grades. Instead of selecting a nut solely by material name, the nut grade, hardness, tensile requirements, and applicable material standard should be considered together with the bolt or stud used in the same connection.
Stainless Steel Thick Nuts for Corrosive Environments
Stainless steel Hex Thick Nuts are selected primarily when corrosion resistance is more important than the higher mechanical strength available from certain heat-treated alloy steel grades. They are suitable for marine hardware, coastal structures, water-treatment equipment, food-processing machinery, outdoor installations, stainless steel fabrications, and chemical-service assemblies. A2 stainless steel can be used for many general corrosion-resistant applications, while A4 stainless steel is more appropriate for environments with greater chloride or corrosion exposure.
Matching Nut Grade with the Mating Fastener
For reliable performance, the nut should be selected as part of the complete threaded connection rather than independently. Carbon steel and alloy steel nuts are commonly paired with suitable carbon or alloy steel bolts and studs according to the required strength level, while stainless steel nuts are normally selected with compatible stainless steel fasteners when corrosion resistance is a key requirement. The thread system, material, grade, hardness, and heat-treatment condition should all be checked before specifying the final combination.