Types of Nuts
Metric Cap Nuts
Our metric cap nuts are manufactured by the cold heading and hot forming technologies in nominal diameters ranging from M3 – M80. Our metric cap nuts meet applicable ASTM, ANSI, ASME, SAE, API, NAS, AN, MS, NACE, ISO, DIN, and KS standards.
Hex Head Cap Nut
Hex head cap nut is manufactured by the cold heading and hot forming technologies in nominal diameters ranging from 1/8"- 3" (M3 – M80). We offer fasteners in both USCS/Imperial and metric sizes. Our fasteners meet applicable ASTM, ANSI, ASME, SAE, API, NAS, AN, MS, NACE, ISO, DIN, and KS standards.
Heavy Duty Hex Nuts
Heavy duty hex nuts are manufactured by the cold heading and hot forming technologies in nominal diameters ranging from 1/8"- 3" (M3 – M80). We offer fasteners in both USCS/Imperial and metric sizes. Our heavy duty hex nuts meet applicable ASTM, ANSI, ASME, SAE, API, NAS, AN, MS, NACE, ISO, DIN, and KS standards.
Steel
Steel is the most common material used for making nuts. It is strong and durable and can be heat treated to improve its properties. Steel nuts are typically less expensive than other types of nuts, and are available in a wide range of sizes and grades.
Stainless steel
Stainless steel is a good choice for nuts that will be exposed to the elements or corrosive chemicals. It is also non-magnetic, which makes it useful for certain applications. Stainless steel nuts are more expensive than steel nuts, but they are more durable and corrosion resistant.
Brass
Brass is a softer metal than steel, but it is also more corrosion resistant. It is often used for nuts that will be exposed to salt water or other harsh environments. Brass nuts are more expensive than steel nuts, but they are less expensive than stainless steel nuts.
Nylon
Nylon is a strong and lightweight plastic that is often used for nuts in applications where weight is a critical factor. Nylon nuts are also non-conductive, which makes them useful for electrical applications. Nylon nuts are less expensive than metal nuts, but they are not as strong or durable.
Other materials
Other materials that can be used for making nuts include aluminum, titanium, and copper. The specific material used will depend on the specific requirements of the application.
Steel nuts
Steel nuts are the most common type of nut and are used in a wide variety of applications. They are typically used in applications where high strength and durability are required, such as construction, automotive, and machinery applications.
Stainless steel nuts
Stainless steel nuts are used in applications where corrosion resistance is important, such as marine applications, chemical processing plants, and food processing plants. They are also used in applications where high strength and durability are required, such as aircraft and aerospace applications.
Brass nuts
Brass nuts are used in applications where corrosion resistance is important and where high strength is not required, such as plumbing and electrical applications. They are also used in applications where a non-magnetic nut is required, such as medical applications.
Nylon nuts
Nylon nuts are used in applications where weight is a critical factor and where high strength is not required, such as aircraft and aerospace applications. They are also used in applications where a non-conductive nut is required, such as electrical applications.
Other materials
Aluminum, titanium, and copper nuts are used in specialized applications where their unique properties are required. For example, aluminum nuts are used in aircraft and aerospace applications because they are lightweight and strong. Titanium nuts are used in aerospace applications because they are lightweight, strong, and corrosion-resistant. Copper nuts are used in electrical applications because they are conductive.
Sizes of Nuts
● Nuts are also commonly referenced using ‘M’ sizes in millimeters (e.g., M3, M8, M12). The size of a metric nut is specified by diameter and pitch dimensions.
● Hex nuts with diameters under 1/4″ are called hex machine screw nuts.
● Standard spanner and allen key sizes for commonly used metric nuts include M5, M6, and M8.
Wire Drawing
The process begins with wire drawing, where steel wire rods are drawn through a series of dies to reduce their diameter. This results in a long, continuous wire with a uniform diameter. The wire used for making nuts is often made of steel, stainless steel, or other materials depending on the application.
Hot Forging
The nut blanks are then heated to high temperatures and placed in a forging machine. In this machine, they are hammered or pressed to shape the head of the nut and form any other necessary features. Forging helps improve the nut’s strength and durability. During this process, the head’s shape and any necessary markings or patterns are created.
Cutting
The continuous wire is cut into individual nut blanks of the desired length. These blanks are typically longer than the final nut’s length to allow for threading and head formation.
Thread Rolling
After forging, the nut shaft is typically thread-rolled to create the screw threads. Thread rolling is a cold-forming process that hardens the threads and enhances their strength and wear resistance.
Heat Treatment
Nuts are heat-treated to improve their mechanical properties. This involves controlled heating and cooling to achieve the desired hardness, strength, and toughness.
Surface Coating
Nuts may receive a surface coating or finish for corrosion resistance and improved aesthetics. Common coatings include zinc plating, galvanizing, or applying a protective layer of paint.
Quality Control
Inspections are carried out to ensure the nuts meet specified standards and are free of defects. This includes checking for proper dimensions, thread quality, and overall integrity.
Packaging
The finished nuts are packaged in bulk or according to specific customer requirements. They are often sorted and counted by size and type for easy identification and use.
Proper Torque Application
Achieving the correct torque during installation is vital. Under-tightening may lead to joint failure, while over-tightening can result in damage. Following manufacturer specifications is crucial.
Thread Engagement
Ensuring sufficient thread engagement between the nut and bolt is essential. Incomplete engagement can compromise the joint’s strength and stability.
Preload and Clamping Force
The concept of preload involves applying a specific force to the bolt before subjecting it to external loads. This preload creates clamping force, holding the components firmly together.
Anti-loosening Measures
Employing methods like the use of locking washers, thread-locking compounds, or prevailing torque nuts helps prevent unintentional loosening of the bolt over time.
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