Crucial Clarifications on Product Specifications

The product page contains several generic or conflicting data points. The following clarifications provide an accurate understanding of this specific product:

• Material: The product is a Carbon Steel Hex Bolt. The zinc plating is a surface finish applied to the steel for protection. The mention of “Stainless Steel” in the material list is a template error and does not apply to this zinc-plated product.
• Grade (Strength Class): The relevant property classes for this carbon steel bolt are 4.8, 8.8, 10.9, and 12.9. These numbers indicate the mechanical strength of the bolt. The stainless steel grades (A2-70, A4-70, etc.) listed on the page are not applicable.
• Finish (White Zinc Plating): The “White Zinc Plated” finish, also known as clear zinc or blue zinc, is an electroplated coating that provides a basic level of protection against rust in dry or low-moisture environments.
• Measurement Systems & Standards: The product page title mentions both Metric (DIN) and Imperial (UNF/UNC, ANSI) standards, while the summary table specifies “Metric”. This indicates that Duojia likely manufactures these bolts to multiple international standards to serve a global market.
  • Metric System (DIN): Typically refers to standards like DIN 933 (fully threaded) and DIN 931 (partially threaded). The “DIN9” in the title is likely a typo for these common standards.
  • Imperial System (ANSI): Refers to American standards with threads per inch, including UNF (Unified National Fine) for fine threads and UNC (Unified National Coarse) for coarse threads.

Product Parameters

Carbon Steel Strength Grades Explained

The grade of a carbon steel bolt determines its strength and is crucial for selecting the right fastener for an application:

• Grade 4.8: A low-strength carbon steel bolt suitable for light-duty fastening and general-purpose applications where high load is not a factor.
• Grade 8.8: The most common structural grade, offering medium-to-high tensile strength. It is a versatile and reliable choice for machinery, automotive, and construction.
• Grade 10.9: A high-strength bolt used for applications requiring significant clamping force and load-bearing capacity, such as in engines or heavy equipment.
• Grade 12.9: The highest standard strength grade, offering exceptional tensile strength for the most critical, high-stress fastening applications.

Key Features

• Standard Corrosion Protection: The zinc-plated finish offers effective protection against rust in general-purpose and indoor environments.
• Economical Fastening Solution: Provides a great balance of performance and affordability, making it ideal for bulk purchasing and cost-sensitive projects.
• Wide Range of Strengths: Available in multiple strength grades to suit everything from simple repairs to high-stress structural applications.
• Available in Multiple Standards: Offered in both Metric and Imperial (UNF/UNC) sizes to meet diverse project requirements globally.

Common Applications

• General Repairs and DIY Projects: A staple fastener for various household and workshop tasks.
• Furniture Assembly: Commonly used for assembling flat-pack and custom furniture.
• Light-Duty Construction: Suitable for indoor framing, fixtures, and applications not exposed to harsh weather.
• Machinery and Equipment: Used for fixing covers, panels, and non-critical components.

Installation Guidelines

1. Align the holes of the components you wish to fasten.
2. Insert the zinc-plated hex bolt through the holes.
3. If using a nut, place it on the opposite side and hand-tighten.
4. Use a correctly sized wrench or socket to tighten the bolt head to the required torque.
5. Caution: Avoid over-tightening or using tools that could damage the zinc coating, as this will compromise its corrosion resistance and may lead to premature rusting at the damaged site.