What Are Heavy Hex Bolts?
What Are Heavy Hex Bolts?
Heavy hex bolts have larger and thicker heads than regular or standard hex bolts, and are commonly used in a wide variety of applications. These building fasteners are available in different sizes, both lengths and diameters, although all come with a hex head.
Some types are threaded all the way up the shaft, while others have a smooth shoulder area. All are designed to be used with hex nuts for a secure fit in construction projects, for repairs, and in automotive applications.
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Required By Specifications
Hex bolts are made with different metals such as regular grades and stainless steel. The common 18-8 grade is used often. These type of bolts also come with various platings such as zinc, cadmium, or hot-dip galvanized.
Heavy hex bolts are required based on a number of different ASTM bolt specifications. In the chemical and petroleum industries, the A193 specification calls for heavy hex bolts and nuts in high heat conditions. The A320 standard covers extremely low temperature conditions and requires the use of heavy hex bolts. Also in ASTM specifications the A307 standard dictates that heavy hex bolts are required in situations where the flanged joints within piping systems are made with cast iron flanges.
As well as the standards above, the A490 and A325 specifications call for heavy hex bolts, but with a shorter thread than the others.
Common Industrial Uses For Heavy Hex Bolts
Besides the industries mentioned above, heavy hex bolts are often seen in the following industrial sectors:
* Steel Fabrication
* Construction of Railroad Systems
* Pumps and Water treatment
* Construction of Modular Buildings
* Renewable and Alternative Energy
Corrosion Resistance Treatment Issues
When a heavy hex bolt is hot-dip galvanized, the treatment results in somewhere between 2.2 and 5 mils of thickness being added. This can cause an issue in the threaded portion of the bolt, so galvanized varieties are tapped to help increase the corrosion resistance.
This common industrial fastener is used with success in many different circumstances. Heavy hex bolts are strong and well designed to meet the specifications and needs of your project.
About the Author
Started my career in the fastener world in 1969 at, Parker Kalon Corp. a NJ based screw manufacturer located in Clifton, NJ working in inventory control, scheduling secondary production and concluding there in purchasing. In 1971 I accepted a sales position at Star Stainless Screw Co., Totowa, NJ working in inside sales and later as an outside salesman, having a successful career at Star I had the desire with a friend to start our own fastener distribution company in 1980 named: Divspec, Kenilworth, NJ. This was a successful adventure but ended in 1985 with me starting Melfast in August 1985 and have stayed competitive and successful to date. Melfast serves the OEM market with approximately 400 accounts nationally.
