What grade are zinc hex bolts
Zinc hex bolts are typically graded as 2, 5, or 8, based on tensile strength: Grade 2 (400-420 MPa), Grade 5 (830 MPa), and Grade 8 (1034 MPa), each suitable for varying load requirements.
Zinc hexagon bolt level 2
Zinc hexagon bolt Class 2 is manufactured from low or medium carbon steel with a tensile strength of approximately 400 to 420 mpa, which is particularly suitable for domestic and light industrial applications. For cost-sensitive projects, Grade 2 zinc hexagon bolts offer an economical and practical solution at about half the cost of higher grade bolts, which are the lowest cost and are primarily used for applications that do not withstand heavy loads. Prices range from approximately $0.10 to $0.20 per hundred, depending on size and batch.
Zinc hexagon bolt level 2 is mainly used in environments that do not bear heavy loads, such as furniture assembly, interior decoration and simple building structures. For example, a standard-sized desk may need to be assembled using 20 to 30 grade 2 zinc hex bolts. These bolts provide sufficient strength to maintain the stability of the structure while also being easy to install and replace.
When selecting a grade 2 zinc hexagon bolt, the corrosiveness of the material needs to be taken into account. Although the zinc layer can provide initial protection for the bolt, in humid or chemically aggressive environments, the zinc layer may not be able to protect the bolt from corrosion for a long time, and it is necessary to consider using higher grade stainless steel bolts or additional anti-corrosion treatment.
Although the 2-stage zinc hexagon bolt has advantages in terms of cost and installation, it also needs to be weighed against its performance limitations when choosing. Compared to Class 5 or Class 8 bolts, Class 2 bolts have lower wear and fatigue resistance, which can be a problem in dynamic load or vibration applications.
Zinc hexagon bolt grade 5
Zinc hexagon bolt Grade 5 is manufactured from medium carbon steel and is heat treated to increase its strength and durability. The tensile strength of these bolts is 830 mpa, which is significantly higher than the 400 to 420 mpa of Class 2 bolts. Class 5 bolts are very popular in more demanding industrial applications, especially where they are subjected to medium to heavy loads. In vehicle manufacturing, level 5 bolts are commonly used to secure important mechanical components such as engines and drivetrains. Class 5 bolts due to medium strength and better durability, for standard sizes, the price is usually 1.5 to 2 times that of Class 2 bolts, and the price per hundred bolts may be between $0.30 and $0.50.
In the construction industry, these bolts are widely used in the construction of steel structures, such as Bridges and beams and columns of high-rise buildings. These structures require bolts to have extremely high load bearing capacity and shock resistance. In a typical steel bridge project, thousands of Class 5 bolts may be needed to ensure that all connections are strong enough to withstand the stresses caused by weather and traffic.
When selecting a grade 5 zinc hexagon bolt, in addition to considering its mechanical properties, it is also necessary to pay attention to its corrosion resistance. In extreme environments such as Marine climates or areas with high salinity, the zinc layer may be depleted faster. In this case additional anti-corrosion treatment is required, such as hot dip galvanizing or the use of stainless steel bolts to extend the service life of the bolts.
Zinc hexagon bolt grade 8
Zinc hexagon bolt Class 8 is manufactured from medium carbon alloy steel and has been thoroughly heat treated to produce tensile strengths of up to 150,000 PSI (approximately 1034 mpa), which is particularly suitable for applications requiring extremely high loads and durability, such as the assembly of heavy machinery, military equipment and large vehicles.
When building large machines or heavy equipment, such as excavators, cranes and large generators, Class 8 bolts are capable of withstanding huge mechanical pressures and dynamic loads. These bolts are also commonly used in bridge construction to ensure the safety and stability of the structure under long-term traffic loads and the impact of the natural environment. For applications in highly corrosive environments, such as offshore platforms or chemical plants, zinc coatings provide basic protection against rust, but long-term exposure to these environments requires further protection. Choosing Grade 8 bolts treated with hot dip galvanizing or using a more corrosion-resistant material such as stainless steel will be more appropriate.
The price of Grade 8 zinc hexagon bolts is usually 1.2 to 1.5 times that of Grade 5 bolts, between $0.50 and $1.00 per hundred, and the specific price will vary according to the size and purchase volume. These bolts offer the highest strength and the best durability for high load and demanding applications.
