A194 Grade 7 Heavy Hex Nuts
Ningbo Teng Qi Fasteners stands as a distinguished manufacturer with two decades of expertise, specializing in American Standard A194 Grade 7 hex nuts. Our advanced cold heading and hot forging processes enable us to produce a comprehensive size range, spanning from 1/4″ to 4″.
The key material employed in our manufacturing is alloy steel 42CrMo, known for its durability and strength. This ensures that our A194 Grade 7 hex nuts meet the highest standards in the industry.
To enhance both functionality and longevity, we offer various surface treatments, including black oxide for a refined appearance, 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 quality, precision, and customer satisfaction is reflected in every A194 Grade 7 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 7 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 7 Heavy Hex Nuts |
|---|---|
| Standard | ASTM A194 |
| Diameter | 1/4"-4" |
| Thread: | UNC/UNF/8UN |
| Materials: | 42crmo equivalent to AISI 4140 Steel |
| Grade: | 7 |
| Proof Load Stress: | 175KSI |
| Hardness: | C24-C38 |
| Marking: | 7+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 |
Proof Load:
| Norminal Size | Thread Per Inch | Proof Load,lbf (Heavy Hex) | Proof Load,lbf (Hex) |
|---|---|---|---|
| 1/4″ | 20 | 5570 | 4770 |
| 5/16″ | 18 | 9170 | 7860 |
| 3/8″ | 16 | 13560 | 11620 |
| 7/16″ | 14 | 18600 | 15940 |
| 1/2″ | 13 | 24830 | 21280 |
| 9/16″ | 12 | 31850 | 27300 |
| 5/8″ | 11 | 39550 | 33900 |
| 3/4″ | 10 | 58450 | 50100 |
| 7/8″ | 9 | 80850 | 69300 |
| 1″ | 8 | 106000 | 90900 |
| 1 1/8″ | 8 | 138200 | 118500 |
| 1 1/4″ | 8 | 175000 | 150000 |
| 1 3/8″ | 8 | 215800 | 185000 |
| 1 1/2″ | 8 | 261100 | 223800 |
Application of A194 Grade 7 Heavy Hex Nuts:
The A194 Grade 7 heavy hex nut is commonly paired with A193 B16 or A320 L7 stud bolts or hex bolts in various industrial applications. Here’s a simple introduction:
The A194 Grade 7 heavy hex nut is a robust fastening component frequently employed alongside A193 B16 or A320 L7 stud bolts or hex bolts. This combination finds widespread use in industries such as construction, oil and gas, power generation, and more. The nut’s durable alloy steel composition, coupled with its high tensile strength, makes it ideal for applications where resilience under extreme conditions is paramount. Whether in petrochemical facilities, power plants, or structural engineering projects, the A194 Grade 7 heavy hex nut plays a crucial role in ensuring secure and reliable fastening connections.
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. |