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M20 Threaded Rod
QS Fastener: M20 Threaded Rod
Name: M20 Threaded Rod
Size: M20
Material: ASTM A193 B7M
Length: 60mm
Surface Process: Fluorocarbon Coated,Red Color
Finish: Zinc-Nickel Coated
Standard: ASME B1.13M
Application: Bolts and Nuts are Used in the Construction and Repair of Barbors, Docks and Piers
Size: M20
Material: ASTM A193 B7M
Length: 60mm
Surface Process: Fluorocarbon Coated,Red Color
Finish: Zinc-Nickel Coated
Standard: ASME B1.13M
Application: Bolts and Nuts are Used in the Construction and Repair of Barbors, Docks and Piers
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M20 Threaded Rod is manufactured from high-strength alloy steel ASTM A193 B7M, compliant with ASME B1.13M standards. This product features a dual-layer protective system—an underlying zinc-nickel alloy coating for rust prevention and an outer red fluorocarbon coating for salt spray corrosion resistance, extending service life by 300%. With a thread accuracy of 6g grade, it ensures a tight fit with nuts and resists loosening under wave impact. Ideal for dock infrastructure maintenance and permanent connections in offshore steel structures, it is a reliable choice for bolt systems in corrosive environments.
In industrial fasteners such as the M20 Threaded Rod, corrosion is a primary cause of material failure, particularly in high-salt, high-acid/alkali environments like marine and chemical industries. To ensure the long-term performance of M20 Threaded Rod made from ASTM A193 B7M under extreme conditions, we employ dual-protection technology combining zinc-nickel plating and fluorocarbon coating, achieving a salt spray resistance exceeding 10 years—far superior to conventional galvanized or Dacromet-treated alternatives.
1. Zinc-Nickel Coating: High-Corrosion-Resistance Base Layer for M20 Threaded Rod
The zinc-nickel coating (Zn-Ni 12~15%) is a widely used anti-corrosion technology for premium M20 Threaded Rod, offering the following advantages:
- Exceptional Salt Spray Resistance: In ASTM B117 salt spray tests, the zinc-nickel coating (8~12μm) on M20 Threaded Rod withstands 1,000 hours without red rust, outperforming traditional galvanization.
The zinc-nickel coating (Zn-Ni 12~15%) is a widely used anti-corrosion technology for premium M20 Threaded Rod, offering the following advantages:
- Exceptional Salt Spray Resistance: In ASTM B117 salt spray tests, the zinc-nickel coating (8~12μm) on M20 Threaded Rod withstands 1,000 hours without red rust, outperforming traditional galvanization.
- Low Hydrogen Embrittlement Risk: The alkaline zinc-nickel electroplating process is specifically suited for high-strength M20 Threaded Rod (HRC≥22).
- Electrochemical Protection: The sacrificial anode effect of zinc combined with nickel’s stability prolongs the rod’s lifespan.
Key Process Details:
- M20 Threaded Rod undergoes rigorous degreasing and pickling before plating to ensure a pristine, oxide-free substrate.
- Pulse plating technology is used to maintain nickel content at 12~15%, optimizing corrosion resistance.
- M20 Threaded Rod undergoes rigorous degreasing and pickling before plating to ensure a pristine, oxide-free substrate.
- Pulse plating technology is used to maintain nickel content at 12~15%, optimizing corrosion resistance.
2. Fluorocarbon Coating: Chemical Barrier for M20 Threaded Rod
The fluorocarbon coating (PVDF or FEVE resin) provides top-tier protection:
- Chemical Inertness: Resists strong acids, alkalis, and salt spray, making it ideal for offshore environments.
- UV Resistance: Less than 5% chalking after 20 years, ensuring outdoor durability for M20 Threaded Rod.
The fluorocarbon coating (PVDF or FEVE resin) provides top-tier protection:
- Chemical Inertness: Resists strong acids, alkalis, and salt spray, making it ideal for offshore environments.
- UV Resistance: Less than 5% chalking after 20 years, ensuring outdoor durability for M20 Threaded Rod.
Coating Process:
- M20 Threaded Rod is coated via electrostatic spraying, with a thickness of 20~30μm, achieving 5B-grade adhesion after high-temperature curing.
- M20 Threaded Rod is coated via electrostatic spraying, with a thickness of 20~30μm, achieving 5B-grade adhesion after high-temperature curing.
3. Synergistic Dual-Protection Mechanism
The zinc-nickel layer and fluorocarbon coating on M20 Threaded Rod work synergistically:
1. The zinc-nickel layer provides electrochemical protection, delaying substrate corrosion.
2. The fluorocarbon layer blocks moisture and Cl⁻, slowing zinc-nickel consumption.
The zinc-nickel layer and fluorocarbon coating on M20 Threaded Rod work synergistically:
1. The zinc-nickel layer provides electrochemical protection, delaying substrate corrosion.
2. The fluorocarbon layer blocks moisture and Cl⁻, slowing zinc-nickel consumption.
Test Data Comparison:
| Treatment | M20 Threaded Rod Salt Spray Test Result |
| Zinc-Nickel + Fluorocarbon (Dual) | 3,000 hours without red rust |
4. Application Examples
- Offshore Wind Turbine Platforms: M20 Threaded Rod shows no corrosion after 10 years in salt spray environments.
- Cross-Sea Bridges: Dual-protected M20 Threaded Rod meets C5-grade corrosion certification.
- Offshore Wind Turbine Platforms: M20 Threaded Rod shows no corrosion after 10 years in salt spray environments.
- Cross-Sea Bridges: Dual-protected M20 Threaded Rod meets C5-grade corrosion certification.
5. Maintenance Recommendations
- Lubricate M20 Threaded Rod with fluorosilicone grease during installation, avoiding Cl⁻-containing media.
- Inspect coating integrity every 5 years, with touch-ups for localized damage.
- Lubricate M20 Threaded Rod with fluorosilicone grease during installation, avoiding Cl⁻-containing media.
- Inspect coating integrity every 5 years, with touch-ups for localized damage.
Conclusion: The ASTM A193 B7M M20 Threaded Rod with zinc-nickel/fluorocarbon dual protection is the optimal choice for docks, offshore structures, and other harsh environments. Its scientifically engineered design effectively resolves the corrosion-loosening chain reaction.
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