Stainless Steel Hex Bolt A2-70 A4-80 for Marine Petrochemical Applications
url-slug: stainless-steel-hex-bolt-a2-70-a4-80
Our stainless steel hex bolts, available in A2-70 and A4-80 mechanical grades, are engineered for high tensile and anti-fatigue performance. Manufactured to international standards (ISO, DIN, ASTM, ASME, ANSI, JIS), these bolts are ideal for marine, petrochemical, and power generation industries where corrosion resistance and reliability are critical.
Key Selling Points
- High tensile strength & anti-fatigue: A2-70 and A4-80 grades ensure robust performance under continuous mechanical load, reducing maintenance frequency.
- Corrosion resistance: 304/316 stainless steel and duplex steel options provide excellent resistance to seawater and acid-base environments.
- Global standard compliance: Conforms to ISO, DIN, ASTM, JIS standards, facilitating use in international projects.
- Precision threading: 6g/2A tolerance class ensures accurate fit and reliable fastening.
- Multiple surface treatments: Passivation, Dacromet, and adhesive pre-coating enhance anti-corrosion and locking performance.
- Custom sizes: M2 to M160 diameter, length 6mm to 300mm, to meet diverse requirements.
Technical Specifications
| Dimension Range | M2 – M160 |
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| Length Range | 6 mm – 300 mm |
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| Mechanical Grades | A2-70, A2-80, A4-70, A4-80 |
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| Standards | ISO, DIN, ASTM, ASME, ANSI, JIS |
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| Thread Tolerance | 6g / 2A precision |
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| Materials | 304/316 stainless steel, duplex steel, nickel-based alloys |
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| Surface Treatments | Natural, passivation, Dacromet, adhesive pre-coating |
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Models and Options
Available in hex bolt, flange bolt, T-bolt, U-bolt, heavy bolt, fit bolt, square bolt, anchor bolt, and foundation bolt types. Any combination of material, grade, and size can be customized.
Materials and Structure
Materials include 304/316 stainless steel, duplex steel (UNS S32205), nickel-based alloys (A286, Inconel 718), and titanium alloys. The hexagonal head design provides a secure grip for torque tools, while the precision threads ensure consistent engagement.
Applications
Ideal for petrochemical plants, power generation facilities, marine & offshore structures, automotive chassis, and general industrial machinery. Also suitable for high-vibration and high-load environments.
Customization
We offer OEM/ODM services for custom sizes, materials, and packaging. Minimum order quantity is 150KG or based on product type. We provide FOB/CNF/CIF delivery terms and pre-shipment inspection with third-party SGS/TUV support.
Case Study
For over 10 years, our bolts have been used in fastening assemblies for aerospace parts, marine equipment, automotive chassis, and power generation. Clients report greatly reduced maintenance costs and stable project operations.
FAQs
Q: What materials are available? A: We offer 304/316 stainless steel, duplex steel, nickel-based alloys such as A286 and Inconel 718, and more.
Q: What grades are available? A: We supply A2-70, A2-80, A4-70, A4-80, and D6-80, D6-100.
Q: What is the MOQ? A: The minimum order is 150KG or based on product specifications.
Q: Can you provide custom sizes? A: Yes, we can customize dimensions from M2 to M160 and lengths up to 300mm.
Q: What international standards do you follow? A: We comply with ISO, DIN, ASTM, ASME, ANSI, and JIS standards.
Q: What surface treatments are available? A: Options include natural finish, passivation, Dacromet, and adhesive pre-coating.
Q: Do you offer inspection services? A: Yes, we provide pre-shipment inspection and third-party testing by SGS or TUV upon request.
Q: What are the payment terms? A: We accept T/T before shipment or T/T at sight on copy of B/L.
Inquiry Information
Contact Michael Shen at michaelshen@uhc-group.com.cn or via WhatsApp +86 13575349247 for pricing and technical consultation.
Image Information
Filename: stainless-bolt.png | Alt: stainless steel hex bolts A2-70 A4-80 with threads
