Hex Bolts

Hex bolts are versatile and valued for their ability to handle high loads, easy installation, and strong connection.

High Quality Hex Bolts

SSM provides hex bolts, a type of fastener with a hexagonal head and a threaded shaft. They are one of the most common bolts used in construction, machinery, and various industrial applications. Hex bolts are designed to be tightened or loosened with a wrench or socket, making them suitable for tasks that require high torque or precision.

Size: 1/4″ – 1 1/2″
Producing Standard: ASME B18.2.1
Materials: Carbon Steel, Stainless Steel, Nickel Alloys.
Coatings: Options like zinc plating, hot-dip galvanizing, or black oxide for corrosion resistance.

Steel Hex Bolts

Common grades include ASTM A307 (low carbon steel), ASTM A325 (high strength), and ASTM A490 (high strength for structural applications).

Stainless Steel Hex Bolts

Often used in corrosive environments, available in grades like 304 and 316.

Alloy Steel Hex Bolts

For applications requiring higher strength, such as AISI 4140 or 4340.

Features of Hex Bolts

Hexagonal head: The six-sided head provides an easy tool grip and allows for high torque application.
Threaded shaft: The shaft can be fully or partially threaded, depending on the application and the need for grip or load-bearing.
Material: Hex bolts are made from a wide range of materials such as stainless steel, carbon steel, and alloy steel, sometimes with coatings for added corrosion resistance (e.g., zinc-plated or galvanized).
Sizes: Available in various diameters and lengths to suit different applications.

Application of Hex Bolts

Construction: Widely used in building frames, bridges, and heavy construction tasks due to their strength.
Machinery: These are commonly found in industrial machinery, where they help secure parts.
Automotive: Used in vehicle assembly to secure parts like engines, frames, and more.
Infrastructure projects: Found in large-scale projects such as railways, pipelines, and wind turbines.

Advantages & Disadvantages of Hex Bolts

Advantages
Due to their hexagonal head, hex bolts provide high torque application capabilities, making them suitable for securing heavy loads. They are versatile, durable, and easy to install and remove, conforming to industry standards, which ensures compatibility with various applications.

Disadvantages
However, hex bolts can be susceptible to corrosion if not properly coated and require specific tools for installation, which may not always be readily available. Additionally, their industrial appearance may not suit aesthetic applications, and over-torquing can lead to potential damage or failure.

One-Stop Hex Bolts Provider for All Your Needs

SSM has significant product advantages in manufacturing Square Head Bolts, Whether it’s quality or price, we will meet your needs.

More Information About Hex Bolts

Dimensions of Hex Bolts

Cut Thread vs Rolled Thread

Cut Threads are threads created by removing material from a fastener’s shaft using a cutting tool, such as a die or lathe. In this process, the material is carved away to form the threads. This method is typically used for larger, custom fasteners or in low-volume production. The material’s grain structure is interrupted during cutting, making the threads slightly weaker than rolled threads.

Rolled Threads are formed by compressing and displacing the material without removing it. The fastener is passed through dies that apply pressure, causing the material to flow and create the thread shape. This method strengthens the material by maintaining and compacting the grain structure. Rolled threads are commonly used for high-volume production and are generally stronger, smoother, and more durable.

Aspect	Cut Thread	Rolled Thread
Production Method	Threads are cut by removing material.	Threads are formed by compressing material.
Surface Finish	Rougher surface.	Smoother surface.
Strength	Weaker, due to cutting through the material grain.	Stronger, as grain structure is preserved.
Material Wastage	More waste, as material is removed.	No waste; material is displaced.
Cost	It is a more expensive and slower process.	Cheaper, faster production.
Common Use	Custom or large-diameter fasteners.	High-volume, smaller, high-strength fasteners.
Durability	Less durable under stress.	More durable and resistant to repeated loads.

Cut Threads are precise but weaker and slower to produce. Rolled Threads are stronger, more durable, and faster to make.

Hex Bolts vs Heavy Hex Bolts

What is a heavy hex bolt?

A heavy hex bolt has a larger and thicker hexagonal head and is typically used in applications requiring high strength and heavy load-bearing capacity. Its bigger head size allows it to withstand higher torque, making it suitable for use in structural steel, bridges, large industrial equipment, and extreme environments such as high pressure and high temperature. Heavy hex bolts are often manufactured according to high-strength standards such as ASTM A490, ensuring their reliability and durability in demanding conditions.

Comparison Item	Hex Bolts	Heavy Hex Bolts
Head Size	Standard hexagonal head	Larger and thicker hexagonal head
Thread Type	Available in fully-threaded or partially-threaded	Available in fully threaded or partially threaded, suited for high-strength applications
Common Applications	Used in general construction, machinery, and light to medium-load applications	Suitable for heavy-duty applications like structural steel, large industrial equipment, and high-pressure environments
Strength	Suitable for medium-strength requirements	Designed for high-strength applications, capable of handling extreme loads
Manufacturing Standards	Common standards: ASTM A307, A325	Strict Standards: ASTM A490, requiring higher strength and performance
Weight and Size	Smaller head size, lighter in weight	Larger head size, heavier, designed for high-load bearing applications
Tool Compatibility	Compatible with common tools like wrenches and sockets	Requires higher torque tools due to the larger head size
Common Materials	Typically made of low-carbon steel, stainless steel, or galvanized steel	Typically made of high-strength steel, offering higher tensile strength

Specifications for Hex Bolts

Specification	Description
ASTM A307	Applicable to low-carbon steel general-purpose bolts, including hex bolts, primarily used for structures and general applications.
ASTM A325	Involves high-strength hex bolts widely used in construction, bridges, and other high-load-bearing structures.
ASME B18.2.1	Defines the geometric size specifications for hex bolts, including head size, thread diameter, and length.
DIN 933 / DIN 931	German standard specifies hex bolts’ dimensions, materials, and mechanical performance requirements.
ISO 4014	An international standard that defines the design and dimensions of hex bolts, ensuring their interchangeability worldwide.
SAE J429	Relates to high-strength hex bolts in the automotive industry, specifying the material properties and mechanical requirements.

Why Can SSM Provide You with High-Quality Hex Bolts?

SSM can provide high-quality hex bolts due to its strict adherence to international standards, use of high-grade materials like carbon steel and stainless steel, and advanced manufacturing processes that ensure precision and consistency. Each batch undergoes comprehensive testing and inspection for mechanical properties and dimensions, backed by the expertise of a skilled team with years of industry experience.

More Resources:

https://en.wikipedia.org/wiki/Fastener