Cold heading Service

Screws Manufacturer In China

Ningbo Teng Qi Fasteners Co., Ltd is a leading screws manufacturer in China. Screws are one of mechanical fasteners with a threaded shank and a head, designed to create a secure and lasting connection between two or more objects. The threaded shank, known as the screw thread, features a helical structure that allows the screw to be rotated into a complementary threaded hole or nut. This action generates a clamping force, firmly holding the objects together.

Screws are a fundamental component of mechanical engineering and construction, offering advantages such as adjustable tension, ease of disassembly, and resistance to vibration. They come in a wide variety of sizes, thread patterns, and materials to accommodate diverse applications. Screws are crucial for building structures, assembling machinery, fastening components, and countless other tasks where a reliable and robust connection is required.


Screw specifications include various characteristics that define their size, thread type, head style, and material. Here are some key specifications commonly used to describe screws:

Product NameScrews
TypeWood Screw/Machine Screw/Sheet Metal Screw/Self-Tapping Screw/Drywall Screw/Concrete Screw/Roofing Screw/Lag Screw/Set Screw/Socket Head Cap Screw
DiameterMetric: M1.4-M48
Imperial:0# to 2"
LengthMetric: Up to 200mm
Imperial: Up to 8"
A2-70 A2-80 A4-70 A4-80
GradeSAE J429 GR.2/5/8
MaterialSteel/Stainless steel/Brass/Aluminum/Titianium
Manufacturing Processwire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment
Surface treatmentBlack Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Application IndustryConstruction/Agricultural Machinery/Industrial Structures/Equipment and Machinery/Infrastructure

These specifications are crucial for selecting the right screw for a particular task, ensuring a secure and effective connection. Keep in mind that different industries and regions might use slightly different specifications, but these are some of the common ones used to describe screws in various applications.

Type of Screws:

There are numerous types of screws, each designed for specific applications based on their unique features. Here are some common types:

Wood Screws: These screw have a sharp point and coarse threads designed to grip wood effectively. They’re commonly used in woodworking projects and attaching materials to wooden surfaces.

Machine Screws: Machine screw have a uniform diameter along their entire length and are used with nuts or threaded holes in machinery, appliances, and electronics.

Sheet Metal Screws: These screw have sharp threads designed to cut through thin metal sheets. They’re often used to join metal parts together or attach items to metal surfaces.

Self-Tapping Screws: Similar to sheet metal screw, self-tapping screws have a sharp point and can create their own threads when driven into a material. They’re often used in materials like plastic or soft metals.

Lag Screws: Also known as lag bolts, these large screw have a hexagonal head and are used for heavy-duty applications, such as securing beams and posts.

Deck Screws: These screws are designed for outdoor use, typically in decking projects. They often have corrosion-resistant coatings and special features for securing wooden deck boards.

Concrete Screws: These screws are designed to anchor objects into concrete, masonry, or brick. They often have special threads or features to provide secure attachment.

Socket Head Cap Screws: These screw have a cylindrical head with a socket drive, making them ideal for applications where a low-profile head is desired.

Set Screws: These screw have no head and are fully threaded. They are often used to secure an object within or against another object.

Thumb Screws: These screw have a large head designed to be tightened by hand, without the need for tools. They’re often used in applications where frequent adjustments are necessary.

These are just a few examples of the many types of screw available. Each type serves a specific purpose and is designed with features that optimize its performance in particular situations.

Manufacturing quality control of screws:

In a world where connections matter, Ningbo Teng Qi Fasteners is more than just a fasteners supplier and manufacturer. We are architects of stability, builders of relationships, and champions of your success. From skyscrapers that reach for the sky to machines that power industries, our screws form the backbone of progress. When you choose Ningbo Teng Qi Fasteners, you choose unwavering quality, exceptional service, and a partner who understands that every bolt holds a piece of your vision.

Control MethodDetail
Material Inspection:Verify the material's composition, heat treatment, and quality upon receipt. Conduct metallurgical analysis to ensure the material properties meet the standards.
Process Control:Implement strict process control measures for heat treatment, machining, threading, and any other manufacturing steps. Maintain consistent process parameters to ensure uniform quality.
Inspection Points:Introduce inspection points at various stages of manufacturing to check for defects, dimensions, and quality. Inspect threading, dimensions, surface finish, and other critical parameters.
Sampling and Testing:Regularly sample products for testing, such as tensile testing, hardness testing, and metallurgical analysis, to ensure they meet the required specifications.
Thread Inspection:Thoroughly inspect threading using proper thread gauges to ensure accurate dimensions and fit with mating components.
Traceability:Implement a traceability system to track each fasteners journey from raw material to final product. This aids in accountability and recalls if necessary.