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Jiangyin Xianggu Hardware Products: A Leading Professional Machine Screw Manufacturer in China

We have specialized in manufacturing various types of Hex Bolts for many years. By doing business with us, you can gain:

Complete Product Range

Our company can provide various stainless steel, carbon steel, copper Hex Bolts, Flange Bolts, Hex Socket Head Screws, Hex Nuts, Spring Washers, Flat Washers and other fasteners. We also offer a variety of coating treatments, such as hot-dip galvanizing, Dacromet, blue-white zinc, yellow zinc.

Professional Management System

Our company is committed to integrating the advantageous supply chain system of various fastener products, focusing on the sales staff's mastery of professional knowledge of fasteners, and aims to provide customers with fastener system solutions.

Rich Experience

We have been working with customers from various countries and industries for many years, so the experience is very rich. We are willing to be your partner with first-class product quality, first-class service level and competitive price.

Wide Range of Product Applications

Our fasteners are widely used in automobiles, ships, wind energy, solar energy, boilers, electronic appliances, mechanical equipment, construction engineering and other fields.

Phillips Rounded Head Machine Screws
Stainless steel pan head screws have good chemical resistance and may be mildly magnetic.. Length is measured from under the head.. Partially threaded screws thread length may vary from the minimum
Slotted Pan Head Screws Machine Screw
Good for use outdoors and in washdown environments, these metric stainless steel screws are more corrosion resistant than steel and nearly as strong. Their pan-shaped head sits nearly flat on the
Slotted Countersunk Head Machine Screws
These stainless steel screws have good chemical resistance and may be mildly magnetic.. All are passivated for added protection against oxidation and corrosion.. They’re angled under the head to sit
Cross Recessed Flat Head Machine Screws
A yellow zinc plating provides mild corrosion resistance.. These screws are angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.

What Is a Machine Screw?

A machine screw is a type of fastener that has a straight, cylindrical shaft with a blunt end and a threaded portion along its entire length. It is designed to be used with a nut or tapped hole to fasten two or more components together. Machine screws are commonly used in machinery, appliances, electronic devices, and other applications where a strong and secure fastening is required.

Advantages of Machine Screw

Versatility

Machine screws are versatile fasteners that can be used in a wide range of applications. They come in different materials, sizes, and styles that can be customized to suit specific applications.

Durability

Machine screws are designed to withstand high levels of stress and tension, which makes them suitable for use in high-load applications. They are also resistant to corrosion, rust, and other environmental factors that can damage other types of fasteners.

Precision

Machine screws are precisely engineered to fit into specific holes and threads, which ensures a tight and secure fit. This precision also ensures that the fastener will not come loose or break, even under heavy loads.

Ease of installation

Machine screws are easy to install, thanks to their compatibility with standard screwdrivers and other tools. They also require minimal preparation or drilling, which means they can be used in a wide range of materials.

How Do I Identify a Machine Screw?

Check the Head Type

Machine screws typically have either a slotted head, Phillips head, Allen head, or Torx head. By identifying the type of head, you can narrow down the options.

Measure the Diameter and Length

Using a caliper or ruler, measure the diameter of the screw and its length. Machine screws are typically sized using two numbers: the first number represents the diameter (in inches or millimeters), and the second number represents the length (also in inches or millimeters).

Count the Threads per Inch

Another way to identify a machine screw is by counting the number of threads per inch. This can help determine if it is a coarse thread or fine thread screw.

Check the Material and Finish

Machine screws are commonly made from materials such as stainless steel, brass, or zinc-plated steel. The finish of the screw can also provide clues about its intended use.

Look for Markings

Some machine screws may have markings on the head that indicate their grade, manufacturer, or other specifications. These markings can be helpful in identifying the screw.

Consult Reference Guides

If you are still unsure about the type of machine screw you have, there are reference guides available online and in hardware stores that can help you identify different types of screws based on their characteristics.

What Are Machine Screws Made Of?

Steel

Steel machine screws are the most common type and are known for their strength and durability. They can be further classified into different grades such as stainless steel, carbon steel, and alloy steel.

Stainless Steel

Stainless steel machine screws are resistant to corrosion and rust, making them ideal for use in environments where exposure to moisture or chemicals is a concern.

Brass

Brass machine screws are often used for decorative purposes or in applications where electrical conductivity is required. They also have good corrosion resistance.

Aluminum

Aluminum machine screws are lightweight and non-magnetic, making them suitable for applications where weight is a critical factor.

Titanium

Titanium machine screws are known for their high strength-to-weight ratio, corrosion resistance, and biocompatibility, making them ideal for aerospace, medical, and marine applications.

Nylon

Nylon machine screws are non-conductive, lightweight, and resistant to corrosion and chemicals. They are commonly used in electrical and electronic applications.

Application of Machine Screw

Electrical equipment

Machine screws are commonly used in the assembly of electrical equipment, such as circuit boards and wiring systems. They are used to secure components, such as switches, relays, and transformers.

Automotive industry

Machine screws are also used extensively in the automotive industry, particularly in the assembly of engines and transmissions. They are used to secure various components, such as rocker arms, oil pumps, and bearings.

Medical equipment

Machine screws are also used in the assembly of medical equipment, such as surgical instruments and implantable devices. They are used to secure components, such as handles, blades, and fittings.

Industrial equipment

Machine screws are also used extensively in the assembly of industrial equipment, such as machinery and equipment used in manufacturing and processing. They are used to secure various components, such as pulleys, gears, and bearings.

Electronics

Machine screws are also used in electronic devices like smartphones, laptops, TVs, etc. to assemble various components inside them.

How Do I Choose the Right Size and Type of Machine Screw?

1. Thread Size: The thread size refers to the diameter of the screw and the number of threads per inch. The most common thread sizes for machine screws are #6, #8, #10, and 1/4". Choose the thread size based on the size of the hole you're screwing into.
2. Length: The length of the screw should be at least the thickness of the material being fastened, plus the length of the screw that needs to protrude through the material.
3. Head Type: The head type depends on the application and the type of tool needed for installation. Flat, pan, and oval head screws are common choices.
4. Material: Choose the material based on the environment and application. For example, stainless steel is ideal for outdoor and marine environments, while brass or aluminum are ideal for decorative applications.
5. Drive Type: Choose the drive type based on the type of tool needed for installation. Common drive types are Phillips, slotted, hex, and Torx.

Are There Any Safety Considerations When Using Machine Screws?

1. Proper Selection: It is important to select the right type and size of machine screw for the specific application. Using the wrong size or type of screw can lead to instability and potential failure.
2. Proper Installation: Machine screws should be installed properly following the manufacturer's guidelines. Over-tightening or under-tightening the screws can compromise their integrity and lead to failure.
3. Use of Personal Protective Equipment (PPE): When handling machine screws, it is important to wear appropriate PPE such as gloves and safety glasses to protect against potential injuries from sharp edges or flying debris.
4. Avoiding Cross-Threading: Care should be taken to avoid cross-threading when installing machine screws, as this can weaken the connection and lead to failure under load.
5. Regular Inspection: Machine screws should be regularly inspected for signs of wear, damage, or loosening. Any damaged or worn screws should be replaced immediately to prevent accidents.
6. Proper Torque: It is important to use a torque wrench when tightening machine screws to ensure that they are tightened to the correct torque specifications. Over-tightening can cause damage, while under-tightening can result in loose connections.
7. Avoiding Mixing Materials: When using machine screws, it is important to avoid mixing materials that may react with each other and cause corrosion or other issues that could compromise the integrity of the connection.

What Tools Are Needed to Install Machine Screws?

1. Screwdriver: A screwdriver is the essential tool required for installing machine screws. The screwdriver should fit the screw heads snugly to ensure the screws are turned effectively.
2. Drill: When pre-drilling holes for machine screws, you may need a drill to ensure a smooth insertion and to prevent the screws from stripping.
3. Taps and dies: Taps and dies are required in case the threads are damaged or need cutting. You will use taps to cut internal screw threads, while dies are used for external threads.
4. Pliers: Sometimes, you may need to hold the machine screws in place while tightening them. In such cases, you can use pliers to hold the screw in place.
5. Nut Driver: A nut driver can help you tighten the nuts onto machine screws without damaging the metal or threads.
6. Socket set: A socket set contains ratchets and sockets that come in handy while working with machine screws of different sizes.
7. Tap wrench and die wrench: Tap wrenches are used to turn taps during internal screw-thread cutting while die wrenches are used to turn dies during external thread cutting.
8. Vise-grip pliers: These pliers can be used to grip machine screws or bolts tightly, without using much force.
9. Hex keys: For hexagonal head screws, you can use hex keys to turn these screws.
10. Torque wrench: A torque wrench is used to measure torque applied to machine screws, making sure that screws are tightened to the exact specifications required by manufacturers.

Types of Machine Screw

1. Flat Head Screws

Flat head screws are designed to sit flush with the surface they're screwed into, providing a neat finish. The head is tapered, allowing it to countersink into the material. They're often used in applications where a smooth surface is required for both aesthetic and safety reasons.

2. Pan Head Screws

Pan head screws have a slightly rounded top and a flat underside. The rounded head provides a low profile compared to other heads while still allowing for good driving force. They're versatile and used in many applications where protrusion of the screw above the surface material is acceptable.

3. Round Head Screws

Round head screws have a semi-elliptical top surface and flat bearing surface which provides good holding power in soft materials. They protrude above the material surface when installed, making them more noticeable but also easier to grip for tightening or loosening.

4. Truss Head Screws

Truss head screws (also known as mushroom head screws) have a low-profile dome shape that offers more surface area under the head than pan or round heads, which helps prevent loosening from vibration. They're commonly used in sheet metal and electrical applications.

5. Hex Head Screws

Hex head screws are designed to be driven by a wrench or socket driver, providing high torque capability which is beneficial for tight fastening applications. They're often used in construction and machinery where strong hold is necessary.

6. Phillips Head Screws

Phillips head screws have an X-shaped slot that accepts a Phillips screwdriver tip for installation or removal. This design allows for better centering compared to flat-slotted screw heads and can handle higher torque without slipping.

7. Torx (Star) Screws

Torx screws have a six-pointed star-shaped pattern that provides excellent resistance against cam-out (slipping out of the screw head) under high torque application. They're popular in automotive and electronic industries.

8. Security Screws

Security screws come in various drive types but are characterized by their unique shapes that require special tools for installation or removal, making them ideal for preventing vandalism or tampering.

Features of Machine Screw

Threaded shaft

Machine screws have a threaded shaft that allows them to be secured tightly to other components.

Small size

These screws are usually smaller in size than other types of screws.

Straight shank

A straight shank is a smooth section of the machine screw shaft that is not threaded. It is used to help secure the screw in place.

Flat or round head

Machine screws can have different head styles, including flat or round.

Phillips or slotted head

The head of a machine screw can be designed with a Phillips or slotted drive to facilitate installation with a compatible tool.

Zinc-plated

Machine screws are often zinc-plated to improve their resistance to rust and corrosion.

Wide range of sizes

Machine screws are available in a wide range of sizes, from very small to quite large.

Used in machinery

Machine screws are commonly used in machinery and other industrial applications.

Tips for Correctly Tightening Machine Screw

1. Use the Right Tool: Always use the correct screwdriver or wrench that fits the screw head properly. Using the wrong tool can damage the screw head, making it difficult to tighten or loosen.
2. Apply Even Pressure: When tightening a machine screw, apply even pressure to ensure that the screw is tightened uniformly. Avoid over-tightening, as this can strip the threads or damage the screw.
3. Follow Manufacturer's Guidelines: Refer to the manufacturer's guidelines for the recommended torque specifications for tightening machine screws. Over-tightening can cause stress on the material and under-tightening can lead to loosening over time.

4. Use Threadlocker: For added security, consider using threadlocker on machine screws that are prone to vibration or loosening. Threadlocker helps prevent screws from backing out due to vibration or movement.
5. Check for Proper Alignment: Before tightening a machine screw, ensure that the components being fastened are properly aligned. Misalignment can cause uneven pressure on the screw, leading to potential damage or failure.
6. Inspect Regularly: Periodically inspect machine screws for signs of wear, corrosion, or loosening. Replace any damaged or worn screws immediately to prevent accidents or equipment failure.
7. Practice Proper Maintenance: Regular maintenance of machinery and equipment includes checking and tightening loose machine screws as part of routine inspections.

Production Steps of Machine Screw

1. Material Selection: The first step in producing machine screws is selecting the appropriate material. Common materials used for machine screws include stainless steel, carbon steel, and alloy steel. The material chosen will depend on the specific requirements of the application, such as strength, corrosion resistance, and cost.
2. Wire Drawing: Once the material is selected, it is typically in the form of wire. The wire is then drawn through a series of dies to reduce its diameter and improve its surface finish. This process also work-hardens the material, making it stronger and more suitable for forming into screws.
3. Heading: In this step, the wire is cut into blanks of the desired length for the screws. The blanks are then heated and formed into a head shape using a heading machine. The head shape can vary depending on the type of screw being produced (e.g., pan head, flat head, round head).
4. Thread Rolling: After heading, the blanks are transferred to a thread rolling machine where threads are formed on the shank of the screw. Thread rolling is a cold forming process that increases the strength and fatigue resistance of the threads compared to traditional cutting methods.

5. Heat Treatment: To improve the mechanical properties of the screws, they undergo heat treatment processes such as annealing, quenching, and tempering. These processes help to achieve the desired hardness, strength, and toughness for the specific application requirements.
6. Surface Treatment: Machine screws may undergo surface treatments such as plating or coating to enhance their corrosion resistance, appearance, or lubricity. Common surface finishes include zinc plating, nickel plating, black oxide coating, and passivation.
7. Inspection and Quality Control: Throughout each step of production, quality control measures are implemented to ensure that the machine screws meet specifications and standards for dimensions, tolerances, thread fitment, and surface finish. Inspections may include dimensional checks, thread gauging tests, hardness testing, and visual inspections.
8. Packaging and Shipping: Once production is complete and quality checks have been passed, the machine screws are packaged according to customer requirements for storage or shipment.

What Is the Thread Pitch of a Machine Screw?

The thread pitch of a machine screw refers to the distance between adjacent threads on the screw's shaft. It is typically measured in millimeters or inches and indicates how fine or coarse the threads are on the screw. The thread pitch is an important specification to consider when selecting a machine screw for a particular application, as it determines how tightly the screw will fasten into a threaded hole or nut.
Machine screws come in various thread pitches, ranging from very fine to coarse. The thread pitch is usually specified along with the diameter and length of the screw. For example, a common machine screw size like M4-0.7 indicates that it has a diameter of 4 millimeters and a thread pitch of 0.7 millimeters.

How to Care for Your Machine Screws: Maintenance Tips

1. Clean them regularly: Use a soft cloth or brush to remove any dirt or debris from the screws. This will prevent the build-up of rust or other corrosive materials.
2. Lubricate the threads: Apply a small amount of lubricant to the threads of the screws. This will make it easier to insert and remove them and will also prevent the threads from becoming damaged over time.
3. Use the correct tools: Always use the correct size screwdriver or wrench when handling your machine screws. Using the wrong size tool can cause the screw head to become stripped or damaged.
4. Store them properly: Keep your machine screws in a dry, cool place to prevent rust or corrosion. You may want to invest in a storage case or organizer to keep them organized and easy to find.
5. Inspect regularly: Check your machine screws periodically to ensure that they are not damaged or worn. If you notice any signs of wear or damage, you may need to replace them to prevent further issues.

Testing Equipment

We use the following equipment to test our products to ensure they meet high quality standards：

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Factory Photos

The picture below is our production workshop:

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FAQ

Q: What are machine screws used for?

A: Machine screws are most often used for fastening metal parts securely together in various types of machinery or construction. Other uses include vehicles, engines, tool assembly, electronic devices, and large-scale industrial equipment.

Q: How long are machine screws?

A: Most machine screws are relatively small compared to other fasters like bolts. Bolts are available in a variety of sizes, with some of them being over 2 inches long. Machine screws, on the other hand, are usually less than 1 inch long.

Q: What is a screw used for?

A: An inclined plane wrapped around a shaft is known as a screw. The two primary functions of a screw are to hold things together or to lift objects. The threading around the shaft in a screw makes it an efficient tool to hold things together.

Q: Is a machine screw a bolt?

A: Machine screws and bolts may seem to be the same thing, but they are not. Bolts have a hex head, while machine screws have a slotted head. Machine screws with slotted heads may be installed using a screwdriver, such as a Philips head or flat-heat screwdriver.

Q: What do you call a machine screw without a head?

A: Set screws are most often headless (aka blind), meaning that the screw is fully threaded and has no head. A blind set screw, known in UK as a grub screw, is almost always driven with an internal wrenching drive, such as a hex Allen key.

Q: What is a machine screw?

A: A machine screw is a type of fastener with a threaded shank and a head designed for insertion into a tapped hole. It is typically smaller in diameter than other types of screws and is used in applications where a precise fit is required.

Q: What are the different types of machine screws?

A: Machine screws can be classified based on their head type, such as flat head, oval head, pan head, socket head, and others. They can also be distinguished by their thread type, which can be either standard or fine.

Q: What materials are machine screws typically made of?

A: Machine screws are commonly made of steel, stainless steel, brass, or alloy steel. The material choice depends on the required strength, corrosion resistance, and cost.

Q: What are the common applications for machine screws?

A: Machine screws are widely used in various applications, including metalworking, automotive repairs, electronics, and machinery. They are often used to secure components or assemblies where a strong, precise, and tight fit is required.

Q: How are machine screws installed?

A: Machine screws are installed by inserting the threaded shank into a pre-tapped hole and then screwing it in place. They can be tightened using a screwdriver, wrench, or torque wrench depending on the size and torque requirements.

Q: Are machine screws reusable?

A: Yes, machine screws are typically reusable if they are not damaged or corroded. However, it is important to check the condition of the screw and the tapped hole before reuse to ensure they are still suitable for the application.

Q: What is the difference between a machine screw and a bolt?

A: The main difference between a machine screw and a bolt is the size and application. Machine screws are smaller in diameter and are typically used in lighter-duty applications where a precise fit is required. Bolts, on the other hand, are larger and are used in heavier-duty applications where a stronger connection is needed.

Q: What tools are needed to install machine screws?

A: To install machine screws, you will typically need a screwdriver or wrench that fits the head of the screw. For larger or tighter screws, you may need a torque wrench to ensure the correct torque is applied.

Q: Are there any safety considerations when using machine screws?

A: When using machine screws, it is important to ensure that the screw and the tapped hole are compatible and properly matched. Overtightening can strip the threads or damage the material, while undertightening can lead to loosening or failure. Always use the correct tools and follow the manufacturer's recommendations for torque settings.

Q: How do I choose the right size and type of machine screw?

A: Choosing the right size and type of machine screw depends on the application and the materials being used. Consider the thickness of the materials, the required strength, and the specific head and thread type needed. Manufacturers typically provide charts or tables to help select the appropriate size and type based on the application.

Q: Can you put a nut on a machine screw?

A: Machine screws typically only need nuts if the hole they are being fastened into isn't tapped or the screw goes through completely, leaving the end sticking out on the other side. Even in the latter scenario, a nut is not always needed but is usually recommended.

Q: What do machine screws look like?

A: A machine screws has a cylindrical shaft threaded its entire length and fits into a nut or tapered hole. Several different head styles are offered. Round combo is the same as round head except for the option of using either a slotted or phillips screwdriver.

Q: Is a screw a lever?

A: Lever and screw are two different types of simple machines. Screws can be visualised as an inclined plane wrapped around a cylinder. Thus it can easily be driven into the wood by turning it with a screwdriver. Hence given statement is false.

Q: How do machine screw sizes work?

A: The first number is the diameter. The bigger the number the bigger the screw. The second number is the number of threads per inch.

Q: What is not a machine screw?

A: Unlike machine screw threads, tapping and drilling screws do not need a mating component to work. As a result, this makes them both more economical and faster to install than a comparable machine screw fixture, such as using a nut and bolt.

As one of the most professional machine screw manufacturers and suppliers in China, we're featured by customized hardware products made in China. Please rest assured to buy or wholesale high quality machine screw for sale here from our factory. For price consultation, contact us.

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