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Explained

The ASTM A641 standard ensures superior quality and corrosion resistance in zinc-coated carbon steel wire, crucial for diverse applications. 

This specification covers the soft, medium, and hard temper zinc-coated (galvanized) carbon steel wire in coils for general use. 

The steel shall be made by any commercially accepted steel making process. The material shall conform to the tensile strength requirements specified. The zinc-coated wire shall conform to the requirements for minimum weight of zinc coating of the specified class. Zinc-coated wire produced as “regular coating” shall have the full surface covered with zinc, but there is no specified minimum weight of coating. 

What is

ASTM A641 is a standard specification for zinc-coated (galvanized) carbon steel wire. It covers requirements for various properties, including tensile strength, coating weight, and adherence, ensuring quality and durability in diverse applications.

Why Important?

Adhering to ASTM A641 ensures that the galvanized steel wire meets specific quality benchmarks. This is crucial for applications where corrosion resistance and structural integrity are paramount, providing reliability and longevity.

Rust Protection 101

Steel & Rust: Steel loves to rust when exposed to moisture.
Zinc Sacrifice: Zinc coating acts as a shield, corroding first to protect the steel.
Longevity: Extends the life of steel products in harsh environments.
Cost-Effective: Prevents expensive repairs and replacements.

Explore the Diverse Grades

ASTM A641 galvanized steel wire comes in various grades, each tailored for specific applications. Understanding these differences is crucial for selecting the right material for your project, ensuring optimal performance and longevity. We provide detailed specifications and use-case scenarios to guide your choice.

Increasing Zinc Coating, Increasing Protection

Choose wisely based on application and environment.

Protection in Different Environments

Class 1 Mild Environment

Class 3 Medium Environment

Class 5 Harsh Environment

Class C Extreme Environment

Coating Class Guidelines

Class 1: Basic protection for general use

Class 3: Enhanced protection for moderate conditions

Class 5: Heavy-duty protection for challenging environments

Class C: Maximum protection for extreme conditions

Wire Diameter in.Class 1 Coating, oz/ft²Class 3 or A Coating, oz/ft²Class 4 Coating, oz/ft²Class B Coating, oz/ft²Class 5 Coating, oz/ft²Class C Coating, oz/ft²
0.0350.150.45n/a0.9n/a1.35
0.0410.150.5n/a1n/a1.5
0.0480.150.55n/a1.1n/a1.65
0.0540.20.6n/a1.2n/a1.8
0.0620.20.65n/a1.2n/a1.8
0.0720.20.65n/a1.2n/a1.8
0.0760.250.71.21.422.1
0.080.250.71.21.422.1
0.0920.280.751.21.522.25
0.0990.280.81.21.622.4
0.1060.30.81.21.622.4
0.120.30.851.21.722.55
0.1350.30.851.21.722.55
0.1480.350.91.21.822.7
0.1620.350.91.21.822.7
0.1770.440.91.21.822.7
0.1920.511.2223
0.207 and larger0.5311.2223
Wire Diameter, mmClass 1 Coating, g/m²A Class 3 or A Coating,g/m²Class 4 Coating,g/m²Class B Coating,g/m²Class 5 Coating, g/m²Class C Coating, g/m²
0.20 to under 0.2520
0.25 to under 0.4025
0.40 to under 0.5030
0.50 to under 0.6035
0.60 to under 0.8040
0.80 to under 1.1045
1.10 to under 1.5055
1.50 to under 1.9065
1.90 to under 2.3075
2.30 to under 3.2085
3.20 to under 4.00100
4.00 to under 4.90115
4.90 to under 5.90150
5.90 and over190
0.9137n/a275n/a412
1153n/a305n/a458
1.2168n/a336n/a504
1.4183n/a366n/a549
1.6198n/a366n/a549
1.8198n/a366n/a549
1.9214366427610641
2214366427610641
2.3229366458610687
2.5244366488610732
2.7244366488610732
3259366519610778
3.4259366519610778
3.8275366549610824
4.1275366549610824
4.5275366549610824
4.9305366610610915
5.3 and larger305366610610915

Temper Controls: Stiffness, Strength, Flexibility, Durability; From Soft to Hard.

Soft Temper
Easy to bend, ideal for binding and general use.
Medium Temper
Balanced strength and flexibility.
Hard Temper
Strong and rigid, for heavy-duty applications.
Wire Diameter, in.Soft, KsiMedium, KsiHard, Ksi
0.035 to under 0.08075 max70 to 10090 to 120
0.080 to under 0.10675 max70 to 9585 to 115
0.106 to 0.176, incl70 max65 to 9080 to 110
Over 0.17670 max60 to 8575 to 105
Wire Diameter, mmSoft, MPaMedium, MPaHard, MPa
0.20 to under 2.00515 max485 to 690620 to 825
2.00 to under 2.50515 max485 to 655585 to 795
2.50 to under 4.70485 max450 to 620550 to 760
4.70 and over485 max415 to 585515 to 715
Wire Diameter, in.Regular and Class 1 CoatingClass 3, 4, 5 or B and C Coating
0.035 to under 0.0760.0020.002
0.076 to under 0.1480.0030.004
0.148 to 0.250, incl.0.0030.004
Over 0.250 to 0.500, incl.0.0030.005
Wire Diameter, mmRegular and Class 1 CoatingClass 3, 4, 5 or A, B, and C Coating
0.20 to under 1.900.050.05
1.90 to under 3.700.080.1
3.70 to under 5.900.080.1
5.90 and over0.080.13

ASTM A641/641M: Ensuring Quality in Galvanized Steel Wire

Mutual Metal Co., Ltd. adheres strictly to the ASTM A641 standard, ensuring our galvanized steel wire meets the highest quality and performance benchmarks. Our products are manufactured with precision, offering superior corrosion resistance and durability for diverse applications. We are committed to providing reliable and consistent products.

  • Material Compliance: Adherence to chemical composition requirements.
  • Coating Specifications: Uniform zinc coating for optimal corrosion protection.
  • Testing Methods: Rigorous testing to ensure mechanical properties and coating quality.
1
Commercial: Basic Coating
The commercial zinc coating provides basic protection for less demanding environments, offering an economical solution for standard applications.
A close-up shot of Class 1 galvanized steel wire, showcasing its smooth surface and lighter zinc coating, ideal for indoor applications and general use.
Class 1 Galvanized Wire
Class 1 offers basic corrosion protection, suitable for indoor or mildly corrosive environments. It's commonly used in fencing, hardware cloth, and general-purpose applications where longevity is not critical.
1
Class 3 or A: Standard Protection
Class A zinc coating offers reliable protection for general applications, balancing cost and performance effectively for various uses.
1
Class B: Enhanced Durability
Class B zinc coating provides excellent corrosion resistance, making it a cost-effective solution for a wide range of applications requiring durability.
A medium shot of Class 3 galvanized steel wire, highlighting its thicker zinc coating and rugged appearance, designed for outdoor and harsh environments.
Class 5 Galvanized Wire
Class 5 provides enhanced corrosion resistance due to its heavier zinc coating. It's ideal for outdoor applications such as agricultural fencing, marine environments, and construction projects requiring long-term durability.
1
Class C: Premium Protection
Class C zinc coating offers the highest level of protection against corrosion, ideal for demanding environments and long-term durability.