Brass DIN7991/931/933 Bolts

Brass DIN7991/931/933 Bolts

Our versatile range of Brass Bolts offers a premium fastening solution where functionality, corrosion resistance, and aesthetic appeal are equally important. This product line, precision-machined from a high-quality brass-copper alloy, includes three distinct DIN standards to meet a variety of application needs: the DIN 7991 Hex Socket Countersunk Head Bolt for a perfectly flush finish, the DIN 931 Partial Thread Hex Head Bolt for superior shear strength in structural joints, and the DIN 933 Full Thread Hex Head Bolt for maximum clamping and tapping applications. Renowned for their excellent electrical conductivity, natural resistance to corrosion, and elegant golden finish, these brass bolts are the premier choice for electrical, marine, architectural, and decorative applications.

Product Details

This product family combines the unique properties of brass with industry-standard designs for specialized performance.

  • Material: Brass/Copper Alloy: These bolts are crafted from a solid brass alloy (primarily copper and zinc). This material provides a unique combination of beneficial properties:
    • Corrosion Resistance: Naturally resistant to rust and corrosion, especially in wet or marine environments.
    • Electrical Conductivity: An excellent conductor of electricity, making it ideal for electrical terminals and grounding points.
    • Non-Magnetic: Safe for use in sensitive electronic or scientific equipment where magnetic interference must be avoided.
    • Aesthetic Appeal: Offers a distinctive, warm golden color that can be polished to a high shine or allowed to develop a rich, natural patina over time.
  • DIN 7991 – Hex Socket Countersunk Head Bolt:
    • Head Style: A flat-topped, conical head designed to sit perfectly flush within a countersunk hole, creating a smooth, snag-free surface.
    • Drive Style: Features an internal hex socket (Allen drive) for controlled, high-torque installation without damaging the bolt head.
    • Primary Use: Ideal for decorative applications, furniture, and assemblies where a clean, unobtrusive finish is paramount.
  • DIN 931 – Partial Thread Hex Head Bolt:
    • Head Style: A standard external hex head for easy tightening with a wrench or socket.
    • Threading: Features an unthreaded shank below the head and a threaded portion at the end. The solid shank provides superior resistance to shear forces, making it ideal for aligning and clamping thick materials together.
    • Primary Use: Structural joints, load-bearing connections, and applications requiring precise alignment.
  • DIN 933 – Full Thread Hex Head Bolt:
    • Head Style: A standard external hex head for use with common tools.
    • Threading: The shank is fully threaded from the tip to the base of the head, providing maximum grip and engagement when used with a nut or tapped into a threaded hole.
    • Primary Use: General-purpose fastening, tapping into pre-threaded holes, and applications where clamping force is distributed along the entire bolt length.

Product Parameters

The technical specifications for our Brass DIN 7991, DIN 931, and DIN 933 Bolts are detailed below.

ParameterSpecification
Product NameBrass DIN7991/931/933 Bolts – CSK & Hex Head Fasteners
StandardDIN 7991 (Countersunk), DIN 931 (Hex, Partial Thread), DIN 933 (Hex, Full Thread)
MaterialBrass / Copper Alloy
Surface TreatmentPlain / Self-Colour
Head StyleCountersunk (CSK) & Hex Head
Drive StyleInternal Hex Socket (for DIN 7991), External Hex (for DIN 931/933)
Diameter RangeM4 – M24
Brand NameDuojia
Place of OriginHebei, China
Key FeaturesCorrosion Resistance, Electrical Conductivity, Non-Magnetic, Decorative Finish
ApplicationElectrical, Marine, Architectural, Furniture, Instruments

Product Features

This comprehensive range of brass bolts is engineered to deliver both performance and elegance:

  • Superior Corrosion Resistance: The inherent properties of brass provide long-lasting protection against rust and corrosion, outperforming standard steel in marine and damp environments.
  • Excellent Electrical & Thermal Conductivity: Makes these bolts the ideal choice for electrical busbars, grounding connections, and heat-sensitive applications.
  • Elegant Aesthetic Finish: The natural golden luster of brass provides a high-end, decorative look for architectural hardware, furniture, and custom projects.
  • Non-Magnetic and Non-Sparking: Safe for use in sensitive scientific instruments, electronics, and volatile environments where magnetic interference or sparks are a concern.
  • Functional Versatility: With flush-mount (DIN 7991) and external hex (DIN 931/933) options available, this range provides a solution for nearly any design requirement, from structural to decorative.
  • Durable and Reliable: Brass is a strong, durable material that ensures a secure and long-lasting fastening solution.

Product Applications

The unique combination of properties makes our brass bolts suitable for a wide array of specialized industries:

  • Electrical and Electronics: Perfect for securing busbars, electrical terminals, grounding lugs, and mounting components on circuit boards.
  • Marine and Plumbing: Widely used for fittings, fixtures, and hardware on boats and in plumbing systems due to its excellent resistance to water corrosion.
  • Architectural and Decorative: Ideal for high-end furniture, custom cabinetry, door hardware, lighting fixtures, and ornamental metalwork.
  • Musical Instruments: Used in the assembly of brass instruments and other high-quality audio equipment where both aesthetics and non-magnetic properties are valued.
  • Precision and Scientific Instruments: Essential for assembling compasses, clocks, and laboratory equipment that cannot be influenced by magnetic fields.