Cold heading Service

A194 Heavy Hex Nuts Gr.7M Manufacturer In China

Ningbo Teng Qi Fasteners Co., Ltd is a leading A194 grade 7M heavy hex nuts manufacturer in China. Leveraging advanced cold heading and hot forging processes, we produce a comprehensive size range from 1/4″ to 4″.

Crafted from medium carbon steel C45, our A194 7M nuts boast a controlled hardness range of 159-237. We meticulously oversee the tempering process, ensuring temperatures exceed 1150 ℉ for optimal mechanical properties.

To enhance both functionality and appearance, we offer various surface treatments, including black oxide for a refined finish, galvanization for corrosion resistance, hot-dip galvanization for extended durability, and zinc flake coatings for prolonged protection.

At Ningbo Teng Qi Fasteners, our commitment to precision, quality, and customer satisfaction is embedded in every A194 Grade 7M heavy hex nut we produce. With 20 years of industry experience, we stand as a reliable partner for your fastener needs.

Hot Dip Galvanized A194 Heavy Hex Nuts Manufacturer


1. Diameter: The diameter of an A194 heavy hex nut refers to the size of the nut’s threaded hole. It is typically specified using a measurement like 1/2″, 5/8″, or 3/4″, indicating the inner diameter.

2. Grade: The grade 7M of an A194 heavy hex nut signifies its strength and material properties.

3. Material: These nuts are commonly made from carbon steel or alloy steel, depending on the grade, to meet specific strength and performance requirements.

4. Surface Treatment: Surface treatment refers to any coating or finish applied to the outer surface of the nuts

Product nameA194 Grade 7M Heavy Hex Nuts
StandardASTM A194
Materials:AISI 4140
Proof Load Stress:150KSI
Marking:7M+Customer Brand
Dimension:ASME B 18.2.2, ASME B
Surface treatment:Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Application IndustryConstruction/Bridges/Industrial Structures/Equipment and Machinery/Infrastructure

Chemical Composition for A194 7M Heavy Hex Nuts:

Chemical ElementsComposition
Phosphorus0.035 Max
Sulfur0.04 Max

Application of A194 Heavy Hex Nuts:

A194 Grade 7M heavy hex nuts, made from robust medium carbon alloy steel, are the sturdy workhorses of various industries. Whether in oil and gas facilities, power plants, construction sites, aerospace applications, mining equipment, or transportation systems, these nuts play a crucial role in securely fastening components, ensuring reliability and safety in diverse and demanding environments. Their high strength and durability make them indispensable in critical structures and machinery across different sectors.

Manufacturing Quality Control of A194 Heavy Hex Nut Gr.2H:

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.