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2H Heavy Nut China Manufacturer
QS Fastener: 2H Heavy Nut China Manufacturer
Name: 2H Heavy Nut China Manufacturer
Standard: ASTM
Material: A194 2H
Size: 3-1/2 Inch
Thread: 8 UN
Surface Finished: Black
Brand: Qishine
Price: USD 2.25 - 4.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Standard: ASTM
Material: A194 2H
Size: 3-1/2 Inch
Thread: 8 UN
Surface Finished: Black
Brand: Qishine
Price: USD 2.25 - 4.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Quantity
The 2H Heavy Nut, manufactured by Qishine in China, is a high-strength, heavy-duty hexagonal nut engineered for demanding bolted connections. Produced in compliance with ASTM A194 and ASME SA-194, this nut is specifically designed to pair with B7 or B16 stud bolts, making it a preferred choice for flanged joints, pressure vessels, and piping systems in petrochemical, power generation, and boiler applications. With a 3-1/2 inch size, 8 UN thread, and a black oxide finish, it offers both dimensional precision and reliable anti-corrosion protection. As a trusted China Manufacturer, Qishine ensures that every batch meets rigorous international standards, including ASME B18.2.2 and B18.2.6, guaranteeing consistent mechanical properties and traceability.
When selecting the right 2H Heavy Nut for your project, several critical factors must be evaluated. First, match the nut size and thread specification exactly with the bolt – for instance, an M20 bolt requires an M20 nut with 2.5 mm pitch to ensure full thread engagement and uniform load distribution. Second, consider the connection load: based on a minimum tensile strength of 1034 MPa, the allowable load for an M20 nut ranges from 200 to 240 kN, with a recommended safety factor of 2.0 for general industrial use. For high-temperature environments up to 400°C, the nut retains over 80% of its tensile strength, but tempering treatment is advised to enhance creep resistance. In corrosive or vibrating conditions, surface coatings like zinc or phosphating, and anti-loosening designs, are highly recommended – salt spray tests show zinc-treated nuts withstand over 500 hours, and anti-loosening versions reduce preload loss to under 5% compared to 20% for standard nuts. For critical applications such as nuclear or high-pressure steam systems, increase the safety factor to 3.0–4.0 and perform finite element analysis to validate the joint integrity.
In summary, the 2H Heavy Nut from this China Manufacturer delivers a balanced combination of strength, heat resistance, and durability. Proper selection based on bolt specs, working environment, load demands, and safety margins ensures a secure, long-lasting connection. With customizable options, competitive pricing, and short lead times, Qishine positions itself as a reliable partner for heavy-duty fastening solutions worldwide.
FAQ
1. What bolts are compatible with the 2H Heavy Nut?
The 2H Heavy Nut is specifically designed for use with ASTM A193 B7 or B16 stud bolts. It meets ASME B18.2.2 and B18.2.6 standards, ensuring proper thread fit and load transfer in high-temperature and high-pressure flange connections.
1. What bolts are compatible with the 2H Heavy Nut?
The 2H Heavy Nut is specifically designed for use with ASTM A193 B7 or B16 stud bolts. It meets ASME B18.2.2 and B18.2.6 standards, ensuring proper thread fit and load transfer in high-temperature and high-pressure flange connections.
2. What is the maximum operating temperature for the 2H Heavy Nut?
The 2H Heavy Nut can operate reliably up to approximately 400°C. At this temperature, it retains more than 80% of its minimum tensile strength (1,034 MPa at ambient). For prolonged exposure above 400°C, consult engineering guidelines for derating or alternative materials.
The 2H Heavy Nut can operate reliably up to approximately 400°C. At this temperature, it retains more than 80% of its minimum tensile strength (1,034 MPa at ambient). For prolonged exposure above 400°C, consult engineering guidelines for derating or alternative materials.
3. How do I choose between black oxide, zinc, or phosphate coating?
Black oxide is standard for general ambient conditions. Zinc or phosphate coatings are recommended for corrosive or humid environments – zinc coating passes 500+ hours in salt spray testing. For vibration-prone applications, pair the nut with a locking washer or choose an anti-loosening design.
Black oxide is standard for general ambient conditions. Zinc or phosphate coatings are recommended for corrosive or humid environments – zinc coating passes 500+ hours in salt spray testing. For vibration-prone applications, pair the nut with a locking washer or choose an anti-loosening design.
4. What safety factor should I use when selecting this nut?
For general industrial equipment, a safety factor of 2.0 is adequate. For high-temperature/high-pressure systems, use 2.5–3.0. In nuclear or critical safety-related applications, increase to 3.0–4.0 and verify with finite element analysis to account for creep, thermal expansion, and cyclic loading.
For general industrial equipment, a safety factor of 2.0 is adequate. For high-temperature/high-pressure systems, use 2.5–3.0. In nuclear or critical safety-related applications, increase to 3.0–4.0 and verify with finite element analysis to account for creep, thermal expansion, and cyclic loading.
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