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Bolts and Nuts

FH-ND: Your Professional Bolts and Nuts Manufacturer!

FH-ND was founded in 2005, located in Ningbo which is the famous city of export in China. After the development with a long history, we have become one of the famous manufacturers of ground engaging tools(G.E.T) in construction machinery and mining machinery areas. FH-ND is also an OEM and supplies high-quality wear parts to many famous companies in the world.

 

 

Why Choose Us

Rich Experience

Ningbo Fenghua ND Machinery Co., Ltd. was established in 2005 and has more than 10 years of experience in the research and development of wear-resistant castings, including bucket teeth, tooth seat edge plates, and other products for construction machinery.

Broad Market

Our parts are already exported to more than 50 countries in the world, mainly to Canada, the USA, Australia, Spain, Sweden, UK, Poland, Italy, Russia, Ukraine, Saudi Arabia, Kuwait, U.A.E., Peru, Chile, Brazil, Argentina, Egypt, Sudan, Algeria, South Africa, India, Myanmar, Korea, Singapore, etc.

Wide Product Range

The company offers a comprehensive range of products, covering most of the world's excavators, bulldozers, loaders, graders, and other wear-resistant accessories.

 

 

Quality Assurance

Using self-developed high-strength, high-quality wear-resistant steel, coupled with scientific and efficient production processes and strict quality management procedures, the company ensures that its products provide customers with high quality and cost-effective solutions.

 

Brief Introduction to Bolts and Nuts

 

 

Nuts and bolts are two types of fasteners used to join two parts together. A nut is a small metal object with a hole in the center surrounded by spirally cut grooves known as threads. Nuts are usually hexagonal in shape, which makes them easy to grip from all sides. They are used as fasteners for mating bolts and are held together by the frictional combination of their threads. Nuts come in a variety of styles, including hex, cap, coupler, wing, turnbuckle, and lock. A bolt is a long piece of metal with a rounded shank for a body that is threaded in a helical (circular) fashion. The bolt body has a head at one end that allows it to be twisted into an object or nut. Bolts come in different length sizes while nuts are standard sizes. Bolts are subjected to tensile forces, and it is the tensile stress that causes them to fail.

 

Advantages of Bolts and Nuts
 

Common in Use
The main advantage of nuts and bolts is that they are very common in use and are readily available everywhere. These are included in those essential tools with which everyone is familiar.

 

Simple to Install
The second advantage of using nuts and bolts is that they are very simple to install. One does not need to go for special guides in order to understand the method to install them. They are very easy to handle and install. One can do it by himself or with the help of some other fellow easily in case of huge nuts and bolts. And same is the case with the loosening of nuts and bolts. The small nuts and bolts are easily loosened with the help of hammers only. The wrenches are also used to loosen the nuts and bolts and are very easy to handle.

 

Resistance to Corrosion
The third important factor that adds to the advantages of using nuts and bolts is their resistance to corrosion. When these nuts and bolts are manufactured, they are plated with a coating of zinc solution that prevents the steel from corrosion. This leads to its longevity and ensures maximum strength for a long period of time.

 

Do Not Require Heat Treatment
The fourth advantage is that they do not require heat treatment during the process of fastening. Most of the time, the fastening tools are provided with heat treatment to ensure that they are correctly fixed, but such is not the case in the usage and installation of nuts and bolts.

 

Types of Bolts and Nuts

 

 

  • Types of Bolts

Different bolts have different functions. Here are some of the most popular kinds of bolts used in DIY projects.

Bolts with Hex Heads
A hex bolt's hexagonal head serves as a surface for grasping or twisting the bolt with a wrench, socket and ratchet, or drill/driver. Some hex bolts have threads that extend the whole length of the shank and are often used in threaded holes. They provide high grip strength because they distribute tension over the whole bolt. The thicker, unthreaded segment of a partially threaded bolt provides strength to the fastening process. Partially threaded hex bolts are also beneficial for operations that need more force to hold the work pieces together. Hex-head bolts are commonly used in construction and automotive applications.

Bolts for Carriage
The domed head of a carriage bolt provides it a smooth, polished appearance. It also adds a layer of safety and security since it does not have a driving surface like a hex-head bolt. Carriage bolts are fastened with washers and hex nuts after being inserted into predrilled holes. The nut is secured to the work piece by a square area under the head, allowing you to attach it with a single wrench, socket, or driver bit. Carriage bolts are used in a wide range of applications, such as decks, furniture, and outdoor playsets.

Bolts for Anchoring
Anchor bolts are classified as either those meant for use in concrete foundations or those intended for use in a wall. L-bolts are intended for usage in wet concrete. While the concrete cures, the bolt is kept in place. L-bolts may be used to secure a deck post to a concrete pad. To secure retrofit anchor bolts in existing concrete, an adhesive is employed. When drilling into a wall stud is not possible, toggle bolts provide support for hanging things.

U-Bolts
U-bolts have two threaded shanks with a rounded or flattened appearance. Rounded U-bolts are used to secure pipe or conduit to a surface, while squared U-bolts are used to fasten things to a surface, such as a square post. The U-bolt is held in position against the item being secured by two nuts and a metal plate.

Bolts for the Eyes
Eye bolts have a loop or ring end and a threaded end for attaching a chain or rope to a wood, metal, or concrete surface. Eye bolts are designed to be used in pre-drilled holes and come with a matching nut. Screw eyes are similar in appearance but have coarser self-tapping threads and a pointed tip that enables them to be driven into a pilot hole in a woodwork item.

Bolts for Hanging
A hanger bolt is a fastener that does not have a head. It has machined threads on one end that accept a nut. The bolt's coarse, self-tapping threads and a point on the other end allow it to be driven into a predrilled hole in wood or comparable material.

Bolts that Split
Split bolts are designed to provide secure electrical connections. They enable the splicing of two wires as well as the connection of cables to terminals. Split bolts made of diverse materials work with a variety of wire types. Make sure your bolt is rated for the kind of wire you're using.

Bolts for the Body
Body bolts are often used in the automotive industry. They are used to attach fenders and other components to a car's body. They have a hex head, a threaded shank, and a washer.

Bolts for Axles
Axle bolts attach wheels to machines like lawnmowers and wagons. The shank's threaded end receives a locking nut, while the smooth section near the head allows the wheels to rotate.

  • Types of Nuts

Nuts work with different types of bolts to secure the fasteners. Although some nuts may be tightened by hand, the majority are designed to be driven using a wrench or socket driver. Here are some of the most often used bolt hardware nuts.

Hexagon Nuts
Hex nuts have a six-sided driving surface. They're a common sort of nut used to connect wood and metal components with bolts of the same size and thread type.

Lock Nuts
Nylon lock nuts have a hexagonal head with an integrated nylon ring. When you tighten a lock nut onto a bolt, the threading of the bolt displaces or deforms the ring, causing friction and preventing loosening from slippage or vibration. A castle nut is a kind of locking nut that works by putting a pin or clip into a hole in the bolt. Rotation is restricted when notches etched into the nut come to rest on the pin.

Wing Nuts
Wing nuts are designed to be tightened and loosened without the need of tools; the wings allow you to tighten and loosen them with your thumb and finger. These nuts are used to make adjustments and removals quick and easy. They may be found on drum sets, light stands, and other items that need to be adjusted on a regular basis.

Cap Nuts
Cap nuts, sometimes known as acorn nuts, are domed and feature a hexagonal driving surface. They are often hand installable. They screw onto the exposed threads of a bolt or threaded rod to protect them and provide a decorative look. Cap nuts may be found in projects like outdoor playsets and fences.

Nuts in Squares
Because they have four relatively large driving surfaces, square nuts are easy to grab and spin. The nut's form allows for a larger surface area to contact the fastening piece, providing better resistance to loosening and tightening. Use flat washers with square nuts to prevent the edges of the nuts from scratching the work piece.

 

Industries That Use Bolts and Nuts 

Many different industries make use of bolts and nuts and other industrial fasteners, such as: 

1

Agriculture
Fasteners are employed in the agricultural sector in grain bins, drying units, buildings, and field irrigation and filtration systems.

2

Automobile/ Transportation
Many different types of vehicles, such as cars, trucks, airplanes, and specialized construction machinery, are put together with the help of fasteners.

3

Building & Construction
Fasteners are essential to the integrity of scaffolding and other support structures used in building and construction applications.

4

Chemical Refining
High performance, corrosion-resistant materials like stainless steel, tool alloys, and exotic metals are used in the fasteners in chemical refineries. They are used in machines such as processing systems, tanks, and heat exchangers.

5

Marine
To withstand the prolonged exposure to saltwater that marine decks, ramps, bulkheads, and tanks experience, fasteners used in the marine sector must have good corrosion resistance. Marine fasteners frequently consist of materials like aluminum and stainless steel.

6

Military
Military fasteners are made to withstand harsh conditions, caustic substances, and high temperatures. Heat exchangers, machinery motors and engines, and processing equipment are examples of frequent usage.

7

Oil & Gas
Fasteners used in the oil and gas industries must work consistently under extreme stress and corrosive circumstances, just like those used in the military. Drilling rigs, tanks, and pumps are a few examples of processing equipment where these fasteners are used.

8

Electrical & Power Generation
High strength and corrosion-resistant materials, such as aluminum, copper, nickel alloys, stainless steel, and other steel alloys, are used to make fasteners for the power generation sector. Typical uses include motors and pumps, exhaust systems, electrical equipment, and storage containers.

9

Plumbing
Pipes are mechanically attached or joined together using pipe fasteners, made of both high tensile and mild steel. Both industrial and domestic pipe fittings use a variety of fasteners.

10

Fire Protection
Bolts begin to bend and shear at high temperatures because the metals begin to shrink as a result of the high temperature. When this occurs, the steelwork's structural integrity deteriorates. If this occurs at the steel's vertices and joints, the chance of a building's components collapsing catastrophically increases. Due to this, it's crucial that the steel bolts used to assemble the steel are high-performance, insulated, and protected, such as with the help of bolt caps.

 

Manufacturing of Bolts and Nuts

 

Manufacturing of Bolts
The bolts are made up of steel metal. Steel itself has many benefits. It is intense as well as affordable. It is readily available as well. The manufacturing process of the bolts involves the following steps:

  • The steel wires are uncoiled and are straightened.
  • Then they are cut into the desired length.
  • At room temperature, the steel is molded into the desired shape.
  • The bolt head is formed by exposing the steel to high pressure.
  • The cutting of the steel forms the threads.
  • Afterward, the steel is exposed to high heat so that it can harden itself up.
  • To prevent the corrosion of steel, it is then plated with zinc.

Manufacturing of Nuts
Nuts are also manufactured through some similar processes. The steps involved in the mechanical manufacturing of nuts are given as follows:

  • The steel wires are straightened.
  • They are made soft so that they can be molded into the desired shapes.
  • The steel wires are treated with sulphuric acid.
  • They are given the shapes of nuts.
  • The threading is dined by rolling and cutting.
  • The nuts are then exposed to extreme heat to harden the steel.
  • They are zinc plated to prevent their surfaces from corrosion
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How to Determine the Right Size of Bolts and Nuts for a Project

 

 

In the realm of construction and DIY projects, the importance of selecting the right size of bolts and nuts cannot be overstated. Whether you're erecting a towering structure or crafting a piece of furniture, the integrity of your creation hinges on the meticulous choice of these seemingly small components.

Understanding the Basics
Bolt Sizing
When embarking on any construction endeavor, the first step is understanding the characteristics of the bolts you'll be using. Bolt sizing involves considering the diameter, length, and thread pitch. The diameter, typically measured in inches or millimeters, determines the thickness of the bolt. For heavy-duty projects, opt for a larger diameter to enhance structural stability.
The length of the bolt is equally crucial. Ensure it extends adequately through all the materials being joined, allowing for proper threading and securing. Thread pitch, denoting the distance between threads, affects how tightly the bolt fastens. Coarser pitches are suitable for robust structures, while finer threads offer precision in delicate assemblies.
Nut Sizing
Complementing the bolt, the nut plays a pivotal role in creating a secure connection. Similar to bolts, nuts come in various sizes, and selecting the appropriate one is paramount. Match the nut's size to the bolt's diameter, ensuring a snug fit. The threading should align seamlessly, promoting a seamless and robust union.

Factors Influencing Sizing Choices
Project Type
Different projects demand different considerations. For heavy-duty construction, such as building a bridge or a skyscraper, opt for larger bolts and nuts with thicker diameters. Conversely, smaller-scale projects like furniture assembly necessitate more delicate components.
Material Selection
The materials comprising your project influence the sizing choices. For projects involving dense materials like steel or concrete, opt for larger bolts to withstand the increased load. Conversely, woodworking projects may require smaller, more nimble bolts and nuts.

Ensuring Safety and Durability
Load-Bearing Capacity
Determining the load-bearing capacity of your chosen bolts and nuts is non-negotiable. Always consult load charts and specifications provided by manufacturers to ensure your selected components can withstand the anticipated stresses. Oversizing in this context is a prudent strategy, providing an additional layer of safety.
Corrosion Resistance
In environments prone to corrosion, such as coastal regions or industrial settings, prioritize bolts and nuts made from corrosion-resistant materials like stainless steel. This precautionary measure ensures the longevity of your project by mitigating the detrimental effects of rust and corrosion.

Best Practices for Bolt and Nut Sizing
Consultation with Experts
When in doubt, seek the guidance of experts in the field. Consulting with structural engineers or experienced builders can provide invaluable insights into the specific requirements of your project. Their expertise can help you navigate the nuanced realm of bolt and nut sizing with confidence.
Utilize Online Resources
In the digital age, a plethora of online resources can assist in determining the optimal size for your bolts and nuts. Utilize sizing calculators, forums, and expert articles to refine your understanding and make informed decisions.

 

Our Factory

The company currently employs approximately 350 skilled professionals, boasting an annual output exceeding 20,000 tons.

 

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Ultimate FAQ Guide to Bolts and Nuts

Q: What are bolts and nuts used for?

A: Bolts and nuts are used to permanently or semi-permanently fasten materials, usually metal. A nut is an attachment that fits the end of a bolt and strengthens its holding power. The bolt, which is non-tapered, then holds the part fastened with the nut.

Q: What are the types of bolts?

A: Bolts are one of the more common types of fasteners and are used to hold two non-threaded pieces together. The head of a bolt, which comes in several varieties, is attached to the threaded male end. Bolts are classified by their shape and type of head.
Anchor Bolts
Anchor bolts are referred to as "cast in place," which means they are included in the fabrication of the component or part and are permanently attached to it. Different types of anchor bolts are designed for specific jobs. They are industrial bolts that have been embedded into concrete for securing columns and support to foundations.
Arbor Bolts
Arbor bolts have a washer permanently attached to the head and reverse threading. The head of an arbor bolt has a sunken design that creates a ridge on the head. Most arbor bolts have a dark or black finish that distinguishes them from other bolts. They are designed to be used with tools such as a miter saw to keep the blade in place.
Carriage Bolts
Carriage bolts have a smooth head with a square section located underneath that keeps the bolt from turning when secured. The popularity of carriage bolts is due to their ability to be used with any type of material, from stainless steel to wood. They are referred to as plow or coach bolts and get their name from their original use, which was to secure carriages and carriage wheels.
Wheel Bolts
Wheel bolts have a threaded stem and tapered head that attaches to the wheel of a car. The bolt goes through the brake rotor hat into the hub and locks the wheels in place.
Elevator Bolts
Elevator bolts were invented for use in the construction of elevators and have a large flat head with a square neck underneath to keep the connection secure when vibrations and shock are present. The flat head is designed to fit flat and flush against the surface of the attached material as well as provide load bearing capacity.
Hex Head Bolts
The hex head bolt gets its name from the hexagonal shape of its head that makes it easy to tighten using a box, socket, or crescent wrench. The six sides of the hexagonal shape give the bolt the proper granularity angles for fastening the bolt in difficult locations. The threads on a hex head bolt extend halfway or all the way up to the bolt head with partially threaded bolts having a higher shearing capacity.
Double End Bolts
A double end bolt has threads at both ends without a head. They can have a nut on one end and be inserted into a threaded hole. Double end bolts come with class five threads for the tap end and class 2A threads for the nut end.
Eye Bolts
Eye bolts have a loop or circular configuration instead of a head. The eye or loop is used for securing electrical lines, holding chains in place, or for guiding ropes. The loop end can be open or closed; the open version does not have a completed loop while the closed version does.
U Shape Bolts
U bolts have two threaded arms connected by a U shape bend without a head. The threaded ends are designed to connect nuts and washers. They are made from carbon, alloy, or stainless steel by cold or hot forging. When the washers and nuts are tightened, they provide clamping force to connect parts or to hold components in place and prevent them from moving.

Q: What are the types of nuts?

A: A nut is a fastener with an external thread that is used with a mating bolt that is of the same size. There are several varieties of nuts that include box and hex types as well as several other specialty kinds, configurations, and designs.
Cap Nuts
Cap nuts are known as dome or acorn nuts and have the shape of a dome on the closed end to protect the bolt-nut assembly.
Castle Nuts
Castle nuts have notches on one end that allow for the insertion of a pin.
Weld Nuts
Welded nuts are welded onto the surface and are used to fasten hard to reach places.
Hex Nuts
The hex nut is one of the most common types of nuts and is easy to install.
Nylon Lock Nuts
Nylon lock nuts have the same shape as a hex nut but have a nylon collar that locks into the bolt to prevent loosening.
Flange Nuts
A flange nut is like a flange bolt and flange screw with a wide flange at one side of the nut to distribute pressure to the piece being secured.
Wheel Nuts
Wheel nuts, known as lug nuts, are a hex nut that threads onto the wheel stud to secure the wheel of a car or truck. They come in different styles and designs and vary in shape to fit the needs of a vehicle. Wheel nuts are made of chrome plated steel but can also be made of aluminum or titanium.

Q: How do I choose nuts and bolts?

A: This is how you choose the right bolt for the joint:
First, identify the load case.
Determine the necessary clamping force in the joint.
Choose the smallest bolt diameter that can support the clamp load.
Choose an effective bolt securing method.
Decide on the most appropriate tightening method.

Q: What are the facts about nuts and bolts?

A: The bolt consists of a head and a cylindrical body with screw threads along a portion of its length. The nut is the female member of the pair, having internal threads to match those of the bolt. Washers are often used to prevent loosening and crushing.

Q: What are the main purpose of bolts and nuts?

A: Both the bolt and the nut grip the materials being fastened, creating a bolt joint, with the nut also preventing axial movement. The effect of the bolt joint comes down to the axial clamping force provided by the nut and the shank of the bolt, which acts as a rod that presses the joint against sideways shear forces.

Q: Does every bolt need a nut?

A: Sometimes two bolts are used to prevent a beam from swiveling. Tap Bolt: This kind of bolt is completely threaded. It is used in a threaded or tapped hole and does not need a nut. A bolt is a type of fastener that often needs a nut that is tightened on the end and helps fasten several materials together.

Q: What do nuts and bolts hold together?

A: Nuts and bolts are fasteners that are used to hold together two or more pieces of wood, metal, or other material. They come in a variety of sizes and types, and each has its own specific use.

Q: How do you identify bolts and nuts?

A: The measurement of an inch nut or bolt will be listed as the thread size — a number between one and 12 or an inch increment followed by the threads per inch (TPI). If the diameter is less than 1/4 inch, the diameter will be listed as a number between zero and 12; the larger the number, the closer it is to 1/4 inch.

Q: Where do you use nuts and bolts?

A: Bolts are designed to be used with a nut, which creates a strong clamping force when tightened. This makes them ideal for applications that require high levels of stress and force, such as construction, manufacturing, and automotive.

Q: What are the common materials used to make bolts and nuts?

A: Steel is the most common material used for making nuts and bolts and fastener materials. Apart from this Alloy; Steel, Silicon, Bronze, Brass, Aluminum, Chrome, Titanium, Plastic, and other exotic materials are also being used for the manufacturing of this product.

Q: How do I measure the size of a bolt or nut?

A: To measure the size of a bolt or nut, you typically need to determine the diameter, thread pitch, and length. The diameter is measured across the widest part of the bolt or nut. The thread pitch refers to the number of threads per unit of measurement, such as threads per inch (TPI) or millimeter (mm). The length is measured from the bottom of the head to the end of the bolt or nut. You can use a caliper or a thread gauge to accurately measure these dimensions.

Q: What are some common applications for bolts and nuts?

A: Bolts and nuts have numerous applications across various industries and everyday life. Some common applications include construction, automotive assembly, machinery, furniture assembly, plumbing, electrical installations, and DIY projects. They are used to join two or more components together securely.

Q: What is torque and why is it important when using bolts and nuts?

A: Torque refers to the amount of rotational force applied to tighten or loosen a bolt or nut. It is important when using bolts and nuts because it ensures proper clamping force and prevents under-tightening or over-tightening. Proper torque helps maintain the integrity of the joint, prevents leaks, and ensures safety. It is typically measured in units of force multiplied by distance (such as Newton-meters or foot-pounds) and can be specified by the manufacturer or calculated based on the application.

Q: How do I properly tighten bolts and nuts?

A: To properly tighten bolts and nuts, follow these general steps:
Use the correct size and type of wrench or socket.
Ensure the bolt and nut are clean and free from debris.
Apply torque gradually and evenly, using a torque wrench if necessary.
Follow the manufacturer's specifications for the recommended torque value.
Avoid over-tightening, as it can lead to damage or failure of the joint.
Consider using a locking mechanism, such as a lock washer or thread-locking adhesive, if necessary.

Q: What are the benefits of using stainless steel bolts and nuts?

A: Stainless steel bolts and nuts offer several advantages:
Corrosion resistance: Stainless steel is highly resistant to rust and corrosion, making it suitable for outdoor and marine applications.
Strength and durability: Stainless steel bolts and nuts have good strength and can withstand high loads and extreme temperatures.
Aesthetic appeal: Stainless steel has a polished and clean appearance, making it popular for visible applications.
Hygienic properties: Stainless steel is easy to clean and maintain, making it suitable for industries like food processing and medical equipment.

Q: What is the difference between metric and standard bolts and nuts?

A: The main difference between metric and standard bolts and nuts is the unit of measurement. Metric bolts and nuts are measured in millimeters (mm) and follow the metric system, while standard bolts and nuts are measured in inches and follow the imperial system. The thread pitch and size standards also differ between metric and standard, with metric bolts and nuts typically having finer thread pitches.

Q: How do I remove a stripped bolt or nut?

A: Removing a stripped bolt or nut can be challenging, but here are a few methods you can try:
Use pliers or adjustable wrenches to grip the edges of the bolt or nut and try turning it counterclockwise.
If the bolt or nut is slightly protruding, you can use a pair of vice grips to grip it tightly and turn it.
Apply penetrating oil or a rust dissolver to loosen the threads before attempting to remove the bolt or nut.
Use a bolt extractor tool specifically designed for removing stripped bolts. These tools grip the bolt or nut and allow you to turn it out.
If all else fails, you may need to drill out the center of the bolt or nut and use a screw extractor to remove it.

Q: How do I prevent bolts from loosening over time?

A: To prevent bolts from loosening over time, you can take the following measures:
Use the proper tightening technique and torque value during installation.
Consider using locking mechanisms such as lock washers, nylon-insert lock nuts, or thread-locking adhesives.
Regularly inspect bolts and nuts for signs of loosening or damage.
Use double nuts or jam nuts to create a locking effect.
For critical applications, consider using prevailing torque nuts or safety wire to provide additional security.

Q: What are some common issues that can occur when using bolts and nuts?

A: Some common issues that can occur when using bolts and nuts include:
Over-tightening or under-tightening, which can lead to joint failure or stripped threads.
Corrosion and rust, especially in outdoor or corrosive environments.
Fatigue failure due to repeated loading and unloading.
Vibration-induced loosening, which can be mitigated by using locking mechanisms.
Stripped threads, making it difficult to tighten or remove the bolt or nut.
Improper selection of bolt or nut size, leading to inadequate strength or fit.

We're professional bolts and nuts manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy bolts and nuts at competitive price from our factory.

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