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Questions And Answers On Flat Head Bolts

What Is The Difference Between Button Head Bolts And Flat Head Bolts?

Differences between button head bolts and flat head bolts are mainly based on their head style. Button head socket cap screws or button head bolts have a dome-shaped head that helps with the distribution of load.

A flat head bolt has a conical head that sits flush or countersunk with a surface. Their similarities include a recessed drive hole, which is hexagonal and can be driven with a hex key or Allen wrench.

What Are The Advantages Of Flat Head Bolts?

The primary advantages of flat head bolts are due to their head style, which is conical or cone-shaped. This feature enables them to sit countersunk once tightened, thereby resulting in low or no-profile within an application.

They are also self-centering and can be installed efficiently and smoothly. Their recessed drive furthers this advantage.

What Are Hex Socket Flat Head Bolts?

Hex socket flat head bolts are fasteners that will sit flush or countersunk once they are installed. This is due to their conical head-style.

They have a hex socket in the center of their head, which is a recessed drive that accommodates hexagonal installation tools, such as hex keys and Allen wrenches. They are manufactured from industrial-grade materials that include carbon steel, alloy steel, and stainless steel.

What Are Flat Head Bolts?

Flat head bolts are structural bolts that facilitate a low profile or countersunk bolt. They can be installed to fit flush with the surface or just below it.

They have a cone-shaped head that contributes to self-aligning properties and a recessed drive that makes them easy to install.

What Are Flat Head Bolts Used For?

Applications of flat head bolts include structural and equipment settings where the fastener head must be placed flush or countersunk to the installation surface.

They can be used as light-duty and heavy-duty fasteners depending on their length, diameter, material, as well as other factors. Settings include furniture, household fixtures, and structural applications.

What Are Flat Head Bolts Made From?

Flat head bolts are manufactured using materials that are commonly used to make structural fasteners. These materials include steel and stainless steel with or without resistance-enhancing treatments, such as zinc-coating, black oxide, and hot-dipped galvanization.

Flat head bolts are also manufactured using non-metal materials, primarily rigid polymers like nylon.

What Are A325 Flat Head Bolts?

A325 flat head bolts meet with ASTM A325 heavy structural bolt specifications. Bolts made to satisfy these industrial requirements are manufactured using medium carbon steel, medium carbon alloy steel, or weathering steel.

They must also meet with a defined set of mechanical properties that are based on diameters ranging from 1/2 to 1 1/2 inches.

How Are Flat Head Bolts Measured?

Measurements of a flat head bolt is its diameter, which is the thickness of its threaded portion, and its length, which is the measurement taken from the flat edge of the head to the end.

The head’s angle and height also have separate measurements. The neck and any unthreaded portion of the shaft will have its own measurements. The drive size will determine the measurement of the recess in the head.

How Are Flat Head Bolts Installed?

Flat head bolt installation is completed by inserting the bolt into a pre-drilled hole in the workpiece. It can also be attached with the addition of a nut that secures it from the back.

Hand-operated or electrical installation tools tighten the bolt through the bolt’s recessed drive until the flat head sits flush or just below the installation surface.

Are Flat Head Socket Cap Screws And Flat Head Bolts The Same Thing?

The primary difference between a flat head bolt and a socket head cap screw is the shape of their head styles. A socket head cap screw has a cylindrical head with a diameter that is slightly wider than that of the shaft.

A flat head bolt’s conical or cone-shaped head extends at an angle from the neck. Both of these fasteners have a recessed drive that’s used for smooth installation.