Ningbo Datian Fastener Co., Ltd.
Ningbo Datian Fastener Co., Ltd.

What is the Difference Between a Standard Hex Nut and a Heavy Duty Hex Nut?

Hexagonal nuts are a common nut that we often encounter in our lives. Hexagonal nuts are often used in conjunction with bolts and screws in work. Nuts play the role of fastener components in work. Among them, L-shaped hexagonal nuts are used. The most widely used in the application, the C-grade nut is used on the surface, and the surface is relatively rough and does not require high precision machinery and equipment.

1. Heavy hexagonal nut dimensions

Heavy hex bolt specifications include A193, A320, and A307B. Although A325 and A490 bolts also require heavy duty hex heads as these bolts have a shorter thread length than standard heavy-duty hex bolts. Heavy-duty hex bolts can be used in many different applications, including fastening wood, steel, and other construction materials, for projects such as docks, bridges, highway structures, and buildings. Heavy hex bolts with forged heads are also commonly used as head anchor bolts.

2. Heavy hex vs hex

Hex bolts are made of different metals such as common grade and stainless steel. The commonly used grades 18-8 are commonly used. These types of bolts also come with various coatings such as zinc, cadmium or hot dip galvanized. Depending on the many different bolt sizes, heavy-duty hex bolts are required. In the chemical and petroleum industries, specifications call for heavy-duty hex bolts and nuts at high temperatures. The standard covers extremely low temperature conditions and requires the use of heavy hex bolts. Also in the code, the standard states that heavy-duty hex bolts are required in cases where flanged joints in piping systems are made of cast iron flanges.

Standard hex nuts, also known as finished hex nuts, have a smaller width at the flats and corners than nut heavy hexs, which are slightly thicker than standard hex nuts of the same nominal size. The main difference between heavy hex bolts and regular hex bolts is the distance of the hex relative to the flat. Heavy-duty hex bolts are 1/8" larger than finished hex bolts of the same diameter. The formula for determining the size of a hex is one and a half times the diameter plus 1/8.

Nut heavy hex bolts have larger and thicker heads than regular or standard hex bolts and are commonly used in a variety of applications. These construction fasteners come in different sizes, lengths, and diameters, although all come with hex heads. Some types have threads all the way up the shaft, while others have a smooth shoulder area. All are designed for safe installation with hex nuts for construction projects, repairs and automotive applications.