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.
Specification:
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 name | A194 Grade 7M Heavy Hex Nuts |
|---|---|
| Standard | ASTM A194 |
| Diameter | 1/4"-4" |
| Thread: | UNC/UNF/8UN |
| Materials: | AISI 4140 |
| Grade: | 7M |
| Proof Load Stress: | 150KSI |
| Hardness: | 159-237 |
| Marking: | 7M+Customer Brand |
| Dimension: | ASME B 18.2.2, ASME B 18.2.4.6M |
| Surface treatment: | Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating |
| Application Industry | Construction/Bridges/Industrial Structures/Equipment and Machinery/Infrastructure |
Chemical Composition for A194 7M Heavy Hex Nuts:
| Chemical Elements | Composition |
|---|---|
| Carbon | 0.37-0.49 |
| Manganese | 0.65-1.10 |
| Phosphorus | 0.035 Max |
| Sulfur | 0.04 Max |
| Silicon | 0.15-0.35 |
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:
| Inspect Item | Detail |
|---|---|
| Dimensional Inspection | Critical dimensions such as bolt diameter, head width, head height, bolt length and thread length are checked using calibrated measuring equipment. Inspection is carried out according to the applicable dimensional standard or customer drawings to ensure consistent fit and interchangeability. |
| Thread Inspection | External threads are inspected using calibrated GO and NO-GO thread gauges to verify thread profile, pitch and dimensional conformity. Additional measurements can be performed when tighter thread tolerances or specific customer requirements apply. |
| Mechanical Testing | Mechanical properties are verified according to the specified material and strength grade. Depending on the applicable standard, testing may include tensile strength, yield strength, hardness and other required mechanical tests, with test results documented in the relevant inspection or material reports. |
| Surface & Coating Inspection | Bolt surfaces are inspected for appearance, defects, coating uniformity and other specified requirements. For coated fasteners, coating thickness and adhesion or other applicable coating characteristics can be checked according to the specified surface treatment standard. |
| Final Inspection & Testing | Before shipment, finished hex bolts undergo final inspection to confirm dimensions, thread quality, mechanical requirements, surface condition, marking and packaging. Inspection records and test reports can be provided according to the order specification and customer requirements. |