ThePipingMart Blog Fasteners What is Hex Bolt? Uses, Dimensions and Properties

What is Hex Bolt? Uses, Dimensions and Properties

What are Hex Bolt

Hex bolts are a type of fastener with six sides. They’re also known as hex cap screws, used in various applications, from furniture assembly to plumbing. Hex bolts are strong, simple to use, and inexpensive compared to other fasteners. Let’s look at how hex bolts work and what makes them such an excellent choice for many jobs.

What is Hex Bolt?

A Hex Bolt is a type of fastener used in many construction projects, from furniture to home improvement projects. It has a hexagonal head and thread on its exterior, which offers a secure connection between two or more objects. Its design makes it easier to tighten with a wrench, as the flat sides allow for greater torque. Its superior strength and sturdiness make it well-suited for projects that require sustained pressure or loads, such as installing door frames. For DIYers, it’s an essential tool in any collection, since it provides an easy way to assemble materials quickly and securely.

Parts of the Hex Bolt

Hex bolts have a head shaped like a hexagon or six-sided shape. This shape makes them easy to hold with wrenches and pliers and allows for extra torque so you can tighten it securely without worrying about it slipping loose. The other part of the bolt is the threaded shaft. Threads on the shaft help it grip materials like wood, metal, and plastic when it’s tightened down. Hex bolts come in various lengths, thread sizes, and grades which are measured by tensile strength (how much force it can take before breaking).

Advantages of Hex Bolts

Hex bolts have several advantages over other types of fasteners. For one thing, they can be tightened down with just about any tool you may have on hand – including wrenches and pliers – which makes them very convenient for most DIY projects or repairs around the house or garage. Another advantage is that they don’t require additional parts like nuts or washers, making installation even easier. Plus, since they don’t need further details, they tend to be less expensive than other fasteners like screws or nails. And lastly, due to their strength and durability, hex bolts are often used in heavy-duty construction projects where high levels of tension need to be maintained for long periods of time without failure or loosening up over time.

Hex Bolt Uses

  • Hex bolts are used in various automotive and industrial applications.
  • One of the most common uses for hex bolts is to secure metal to wood. This is because the hex head provides a large amount of grip, making it less likely for the bolt to slip out.
  • Hex bolts are also commonly used in construction applications. They can be used to secure lumber and other building materials together.
  • Another everyday use for hex bolts is to secure machinery and equipment together. This includes everything from lawn mowers to industrial machines.
  • Hex bolts can also be used in other applications, such as securing pipe fittings or creating a temporary repair.

Hex Bolt Properties

  • Hex bolts are made from various materials, including steel, stainless steel, brass, and bronze.
  • Hex bolts come in various sizes, from tiny screws used to secure eyeglasses to large bolts used to secure heavy machinery.
  • Hex bolts have a hexagonal head designed to be driven by a wrench or socket.
  • The threads on a hex bolt are usually right-handed, meaning they will tighten when turned to the right and loosen when turned to the left.
  • Hex bolts are often used in applications where a high level of torque is required, such as in automotive and construction applications.

Hex Bolt Dimensions

Hex Bolt Dimensions

Hex Bolt Dimensions (ANSI B18.2.1-1996)
Size or Basic Diameter
Click on Size to Shop Products
Body Diameter
Width Across Corners (G) Head
Radius of Fillet (R) Thread
Max Min Basic Max Min Max Min Basic Max Min Max Min Basic (6 in. and shorter) Basic (Over 6 in.)
1/4 (0.2500) 0.260 0.237 7/16 0.438 0.425 0.505 0.484 11/64 0.188 0.150 0.03 0.01 0.750 1.000
5/16 (0.3125) 0.324 0.298 1/2 0.500 0.484 0.577 0.552 7/32 0.235 0.195 0.03 0.01 0.875 1.125
3/8 (0.3750) 0.388 0.360 9/16 0.562 0.544 0.650 0.620 1/4 0.268 0.226 0.03 0.01 1.000 1.250
1/2 (0.5000) 0.515 0.482 3/4 0.750 0.725 0.866 0.826 11/32 0.364 0.302 0.03 0.01 1.250 1.500
5/8 (0.6250) 0.642 0.605 15/16 0.938 0.906 1.083 1.033 27/64 0.444 0.378 0.06 0.02 1.500 1.750
3/4 (0.7500) 0.768 0.729 1-1/8 1.125 1.088 1.299 1.240 1/2 0.524 0.455 0.06 0.02 1.750 2.000
7/8 (0.8750) 0.895 0.852 1-5/16 1.312 1.269 1.516 1.447 37/64 0.604 0.531 0.06 0.02 2.000 2.250
1 (1.0000) 1.022 0.976 1-1/2 1.500 1.450 1.732 1.653 43/64 0.700 0.591 0.09 0.03 2.250 2.500



Hex bolts are an essential tool for DIYers who need reliable fastening solutions that don’t require too much effort to install or remove. With their six-sided heads and threaded shafts that offer superior gripping power in all kinds of materials, hex bolts provide secure connections that won’t loosen over time – making them an excellent choice for all sorts of home improvement projects as commercial applications such as plumbing and construction work. Whether you’re assembling furniture or doing heavy-duty repairs around your home or business premises, having some handy hex bolts in your arsenal will ensure your project stays securely together no matter what!

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