Crucial Clarifications on Product Specifications

The product page contains several conflicting or generic data points from a template. The following clarifications provide a precise and accurate description of this specific stainless steel product:

• Material and Grade: This product is made exclusively from Stainless Steel. The listed carbon steel grades (4.8, 8.8, 10.9, 12.9) are not applicable. The correct and relevant grades for this product are A2-70, A4-70, and A4-80.
• Surface Treatment and Finish: Stainless steel is inherently corrosion-resistant and does not require plating. The listed options “White Zinc Plated,” “Yellow Zinc Plated,” and “Black Oxide Coating” are for carbon steel bolts. The correct finishes for this stainless steel product are Plain (Passivated), which is the natural silver-gray finish, or Polished for a brighter, more reflective appearance.
• DIN 933 vs. DIN 931: The product title correctly indicates that both standards are available, offering flexibility for different application requirements.
• Kits: The title’s mention of “& Washer Kits” confirms that these bolts can be supplied as a set with corresponding stainless steel washers and nuts, ensuring material compatibility and preventing galvanic corrosion.

Product Parameters (Corrected and Clarified)

Understanding the Stainless Steel Grades

• A2 Stainless Steel (equivalent to Type 304): This is the most common and versatile grade of stainless steel. It offers excellent corrosion resistance in freshwater, atmospheric, and food-grade environments. It is the standard choice for general construction, automotive, and household applications.
• A4 Stainless Steel (equivalent to Type 316): Known as “marine grade,” A4 stainless steel contains molybdenum, which provides superior corrosion resistance, especially against chlorides (like salt water and de-icing salts) and industrial chemicals.
• Strength Class (“-70” / “-80”): This number indicates the tensile strength of the bolt.
  • -70: Represents a minimum tensile strength of 700 MPa.
  • -80: Represents a higher minimum tensile strength of 800 MPa.

Understanding the Standards: DIN 933 vs. DIN 931

• DIN 933 (Full Thread): The bolt is threaded along its entire shank. This is ideal for applications where the bolt is threaded into a tapped hole or when maximum clamping adjustment with a nut is required.
• DIN 931 (Partial Thread): The bolt has a plain, unthreaded portion of the shank under the head. This design is superior for applications with high shear loads, as the solid shank provides greater strength against sideways forces compared to threads.

Key Features

• Superior Corrosion Resistance: A2 and A4 grades provide long-lasting protection against rust and corrosion.
• Application-Specific Grades: Choose A2 for general use and A4 for marine, coastal, or chemical environments.
• Versatile Standards: Available in fully threaded (DIN 933) and partially threaded (DIN 931) to suit clamping or shear-load requirements.
• Clean and Professional Appearance: The natural finish of stainless steel is suitable for visible applications in architecture and consumer products.
• System Compatibility: Available as kits with matching nuts and washers to ensure proper fitment and prevent galvanic corrosion that can occur when dissimilar metals are mixed.

Appropriate Applications

• A2 Grade Applications: Food processing equipment, kitchen installations, architectural trim, indoor and freshwater boating hardware, general industrial machinery.
• A4 Grade Applications: Saltwater marine equipment (boats, docks), coastal construction, swimming pool facilities, chemical processing plants, and areas where de-icing salts are used.