Black Round Head Bolt

When it comes to reliable fastening solutions, the Round Head Bolt stands out for its versatility and durability in various industrial applications. These bolts are engineered to provide strong connections in machinery, automotive assemblies, and construction projects. The black finish enhances corrosion resistance, making them ideal for outdoor or harsh environments. Whether you're securing heavy equipment or assembling structural frameworks, these bolts ensure long-lasting performance. For superior quality and precision, our range of Round Head Bolts meets international standards, delivering unmatched strength and reliability. Explore our selection to find the perfect fit for your needs, backed by years of expertise in fastener manufacturing.


The Black Round Head Bolt features a smooth, rounded head design that minimizes protrusion, reducing the risk of snagging or injury in tight spaces. Made from high-grade steel, it undergoes a rigorous black oxide coating process to resist rust and wear. This bolt is commonly used in applications where a flush surface is desired, such as in furniture assembly, automotive parts, and electrical enclosures. Its robust construction ensures it can withstand high torque and vibration without loosening. The Black Round Head Bolt is available in various sizes and thread patterns to accommodate diverse project requirements, providing a secure and efficient fastening solution every time.

Key Specifications

  • Material: High-carbon steel
  • Finish: Black oxide coating
  • Head Type: Round
  • Drive Type: Hex socket or slotted
  • Thread Type: Metric or imperial
  • Standards: ISO 7380, DIN 7380, ANSI B18.3
Size (Diameter x Length) Thread Pitch Torque Capacity (Nm) Recommended Applications
M6 x 20mm 1.0mm 10-12 Nm Light machinery, electronics
M8 x 30mm 1.25mm 20-25 Nm Automotive parts, furniture
M10 x 40mm 1.5mm 35-40 Nm Construction, heavy equipment
M12 x 50mm 1.75mm 55-60 Nm Industrial machinery, structural frames

Hot Products

  • Acorn Hex Nuts

    Acorn Hex Nuts

    Get a clean, closed-end finish with Xiaoguo® Acorn Hex Nuts made in China. They cover exposed threads to prevent rust, snags, and corrosion. Perfect for furniture, automotive, and assembly work. Request your Acorn Hex Nuts quotation today.
  • Grade 5 Square Head Bolt

    Grade 5 Square Head Bolt

    Xiaoguo®'s advanced Grade 5 square head bolt do not require special wrenches. Ordinary open-end wrenches, adjustable wrenches and star wrenches can be used instead. They can be easily accessed at the maintenance site. This reduces tool procurement costs and makes work more efficient.
  • Type A Square Weld Nut

    Type A Square Weld Nut

    Type A square weld nuts are used for welding on metal surfaces and are equipped with threaded holes for bolts. They are suitable for metal frames, supports or mechanical equipment that require fixed nuts. The Xiaoguo® factory produces in accordance with the standards stipulated in GB/T 13680-1992.
  • Screw Standard Flat Washer

    Screw Standard Flat Washer

    As the supplier of Screw Standard Flat Washer, Xiaoguo® offers products that have passed rigorous testing. During operation, our products can effectively distribute the locking force evenly across a larger contact surface, preventing material deformation.
  • High Efficiency Weld Studs

    High Efficiency Weld Studs

    The manufacturers Xiaoguo® offers a diverse range of products like screws and bolts.The primary function of high efficiency weld studs is to provide a robust, permanently attached threaded or unthreaded stud protruding from a surface.
  • Bolting For Use With Stral Pipe Falanges-Hexagon Nuts And Style 1

    Bolting For Use With Stral Pipe Falanges-Hexagon Nuts And Style 1

    As the professional manufacturer, Xiaoguo® would like to provide you Bolting For Use With Stral Pipe Falanges-Hexagon Nuts And Style 1. And Xiaoguo® will offer you the best after-sale service and timely delivery.

Send Inquiry

X
We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. By using this site, you agree to our use of cookies. Privacy Policy
Reject Accept