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Heavy Hex Nut

A heavy hex nut is a six-sided internally threaded fastener that is both wider and thicker than the same-sized finished hex nut. This design provides increased strength and bearing surface area, making heavy hex nuts ideal for large diameter and high-strength bolt applications. They are commonly used in structural and heavy-duty applications where enhanced load-bearing capacity is essential. Heavy hex nuts are available in various grades, including ASTM A563 Grade DH, ASTM A194 Grade 2H, and ASTM F594, each offering specific mechanical properties to suit different requirements. These nuts are typically used with bolts of the same grade to ensure compatibility and optimal performance. The heavy hex nut's robust construction ensures secure and reliable fastening in demanding environments.

Size Range
Diameter Metric: M4 to M80
Inch: 1/2" to 3"
Length ----
Technical Specifications

           Heavy Hex Nut          

Major Dia of thread (d)


s

e

m
Width Across Flats Width Across Corners Thickness

Basic

Max

Min

Max

Min

Basic

Max

Min
1/2 "
0.5000
7/8
0.875
0.850
1.010
0.969
31/64
0.504
0.464
9/6 " 0.5625 15/16 0.938 0.909 1.083 1.037 35/64 0.568 0.464
5/8 " 0.6250 1-1/16 1.062
1.031 1.227 1.175 39/64 0.631 0.587
3/4 " 0.7500 1-1/4 1.250 1.212 1.443 1.382 47/64 0.758 0.710
7/8 " 0.8750 1-7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833
1 " 1.0000 1-5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956
1-1/8 " 1.1250 1-13/16 1.812 1.756 2.093 2.002 1-7/64 1.139 1.079
1-1/4 " 1.2500 2 2.000 1.938 2.309 2.209 1-7/32 1.251 1.187
1-3/8 " 1.3750 2-3/16 2.188 2.119 2.526 2.416 1-11/32 1.378 1.310
1-1/2 " 1.5000 2-3/8 2.375 2.300 2.742 2.622 1-15/32 1.505 1.433
1-5/8 " 1.6250 2-9/16 2.562 2.481 2.959 2.828 1-19/32 1.632 1.556
1-3/4 " 1.7500 2-3/4 2.750 2.662 3.175 3.035 1-23/32 1.759 1.679
2 " 2.0000 3-1/8 3.125 3.025 3.608 3.449 1-31/32 2.013 1.925
2-1/4 " 2.2500 3-1/2 3.500 3.388 4.041 3.862 2-13/64 2.251 2.155
2-1/2 " 2.5000 3-7/8 3.875 3.750 4.474 4.275 2-29/64 2.505 2.401
2-3/4 " 2.7500 4-1/4 4.250 4.112 4.907 4.688 2-45/64 2.759 2.647
3 " 3.0000 4-5/8 4.625 4.475 5.340 5.102 2-61/64 3.013 2.893
All dimensions are in inches.

Proof Load Size Range Equivalent Standards
Property Class Diameter Length
PSI N/mm2 Grade Metric Inch Metric Inch IS ISO DIN BS ANSI ASME B18.2.2 JIS
74000 to 174000 510 to 1200 4 to 12 M4 to M80

1/2 " to 3 "

- - 6623 4775 6915 4395 B18.2.3.7M B18.2.4.6M B1181



Introduction to Heavy Hex Nuts


A heavy hex nut is a six-sided internally threaded fastener that is both wider and thicker than the same-sized finished hex nut. This design provides increased strength and bearing surface area, making heavy hex nuts ideal for large diameter and high-strength bolt applications. They are commonly used in structural and heavy-duty applications where enhanced load-bearing capacity is essential. Heavy hex nuts are available in various grades, including ASTM A563 Grade DH, ASTM A194 Grade 2H, and ASTM F594, each offering specific mechanical properties to suit different requirements. These nuts are typically used with bolts of the same grade to ensure compatibility and optimal performance. The heavy hex nut's robust construction ensures secure and reliable fastening in demanding environments.


Applications of Heavy Hex Nuts


Heavy hex nuts are widely used in various industries, including construction, machinery, and automotive sectors. In construction, they are employed to secure structural connections in bridges, buildings, and other heavy-duty constructions. In machinery, heavy hex nuts are used to secure parts such as gearboxes and motors, preventing loosening that could lead to mechanical failure. The automotive industry also benefits from the use of heavy hex nuts to secure components like suspension parts, steering mechanisms, and engine components, ensuring they remain tightly fastened even during high-impact conditions.


Advantages of Heavy Hex Nuts


The primary advantage of heavy hex nuts is their increased strength and bearing surface area compared to standard hex nuts. This makes them ideal for applications that involve heavy loads and high stress. Heavy hex nuts are designed to provide enhanced load-bearing capacity, ensuring secure and reliable fastening in demanding environments. They are also available in various grades, each offering specific mechanical properties to suit different requirements. This versatility makes heavy hex nuts a popular choice for numerous industries, ensuring tight and secure connections in a range of applications.


Materials Used for Heavy Hex Nuts


Heavy hex nuts are available in a wide variety of materials, each chosen based on the specific requirements of the application. Common materials include carbon steel, alloy steel, and stainless steel, which offer durability and resistance to corrosion. Stainless steel heavy hex nuts are often used in environments exposed to moisture or corrosive substances, while carbon and alloy steel heavy hex nuts are ideal for high-strength applications. The choice of material depends on the specific requirements of the application, including environmental conditions and load-bearing capacity.


Installation and Maintenance


Installing a heavy hex nut is a straightforward process. To install, simply thread the heavy hex nut onto the fastener and tighten it as usual. It is important to ensure that the heavy hex nut is compatible with the bolt and that both are of the same grade to ensure optimal performance. While heavy hex nuts require minimal maintenance, it is important to check for signs of wear, rust, or corrosion over time. If necessary, replace the heavy hex nut or the bolt to maintain the integrity of the connection and prevent loosening.


Heavy Hex Nut Variations and Sizes


Heavy hex nuts come in a range of sizes, typically corresponding to the standard nut sizes they are used with. They are available in various thread pitches and diameters to suit different applications. Some heavy hex nuts feature a thin profile, while others are thicker, providing additional locking strength for heavy-duty applications. It is important to select the correct heavy hex nut size to ensure compatibility with the bolt and the overall fastening system.

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