Clarification of Standards: DIN 931 vs. DIN 933

The product is available under two different German Institute for Standardization (DIN) standards, which define the bolt’s threading:

• DIN 933 (Fully Threaded): Bolts manufactured to this standard have a threaded shank along their entire length. This design is best suited for applications where the bolt is fully engaged in a tapped hole or when clamping force needs to be distributed across the bolt’s full length.
• DIN 931 (Partially Threaded): Bolts manufactured to this standard feature a partially threaded shank with a smooth, unthreaded portion under the head. This unthreaded shank provides superior shear strength, making it the preferred choice for applications that must resist sideways forces and require precise alignment.

Crucial Clarification on Material and Grade

The product page contains conflicting information in its summary table. The following clarification is essential for accurate product understanding:

• Material: The product is a Brass Hex Bolt. The listing of “Stainless Steel” alongside “Brass” is a template error. The detailed product introduction correctly identifies the material as “high-quality brass, which is an alloy mainly composed of copper and zinc.”
• Grade: The listed property classes (4.8, 8.8, 10.9, 12.9, A2-70, A4-70, etc.) are standards for carbon steel and stainless steel fasteners. These grades are not applicable to brass bolts. Brass has its own material specifications and strength properties, which are different from those of steel.

Product Parameters

Key Features

• Good Electrical Conductivity: Brass is an excellent conductor of electricity, making these bolts ideal for fastening electrical components, terminals, and busbars.
• Excellent Corrosion Resistance: The copper content in brass provides natural resistance to corrosion and rust, making it suitable for plumbing and certain marine environments.
• Aesthetic Appeal: The natural golden color of polished brass adds a high-end, decorative touch to projects, making it popular for furniture, fixtures, and architectural hardware.
• Non-Marring Material: Brass is softer than steel, which reduces the risk of scratching or damaging the surfaces of the components being fastened.
• Non-Sparking: Brass is a non-sparking metal, a critical safety feature for applications in explosive or flammable environments.

Common Applications

• Electrical Equipment: Connecting components in electrical cabinets, switchgear, and grounding applications.
• Plumbing Systems: Fastening pipes, valves, and fittings where water corrosion is a concern.
• Decorative Hardware: Used in high-end furniture, lighting fixtures, and architectural details where appearance is important.
• Musical Instruments: Commonly used in the assembly of brass and woodwind instruments.
• Light-Duty Mechanical: Suitable for applications where high tensile strength is not the primary requirement but corrosion resistance and appearance are.

Installation Guidelines

1. Ensure the hole is correctly sized for the bolt. A through-hole will require a nut, while a blind hole must be tapped with the correct thread.
2. Insert the brass bolt through the components to be fastened.
3. Use a correctly sized wrench (socket, open-end, or ring spanner) on the hexagonal head to tighten.
4. Caution: Brass is a softer metal than steel. Do not apply excessive force when tightening, as this can easily strip the threads or damage the bolt head. Tighten only enough to ensure a firm and secure connection.