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ANSI Zinc Plated Round Head Square Neck Bolt M20 BSW Thread

Round Head Bolt
December 18, 2025
Category Connection: Round Head Bolt
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Tags:
#round head nut bolt #round head square neck bolt #round head carriage bolt
Brief: In this video, we provide a guided demonstration of the ANSI Zinc Plated Round Head Square Neck Bolt with M20 BSW Thread. You'll see how the square neck is inserted into a groove to minimize protrusion and how the bolt is secured with a nut from the reverse side. We'll also cover common applications in structural steel, metal buildings, and machinery where these bolts are effectively used.
Related Product Features:
  • Round head design with a square neck that fits into grooves to reduce protruding surface height.
  • Manufactured to ANSI/ASME, JIS, GB, and ISO standards for reliable performance.
  • Available in sizes including M6, M8, M10, M12, M16, and M20 to suit various applications.
  • Constructed from durable carbon steel with grade options of 4.8, 5.8, 6.8, and 8.8.
  • Features BSW thread type along with UNC and UNF options for versatile fastening needs.
  • Zinc plated finish available in clear, blue, yellow, or black for corrosion resistance.
  • Ideal for use in structural steel, metal buildings, oil and gas, and mechanical machinery.
  • Packed in cartons on wood pallets or customized to meet specific customer requirements.
Faqs:
  • What is the purpose of the square neck on this round head bolt?
    The square neck is designed to be inserted into a groove on the connected part, which prevents the bolt from rotating during assembly and reduces the height of the protruding surface, making it suitable for applications where a low profile is needed.
  • In which industries are these round head square neck bolts commonly used?
    These bolts are widely used in structural steel, metal building construction, oil and gas, towers and poles, wind energy, mechanical machinery, and the automobile industry due to their reliable fastening and low-profile design.
  • What material and finish options are available for these bolts?
    The bolts are made from carbon steel with grades 4.8, 5.8, 6.8, and 8.8, and they feature a zinc-plated finish that comes in clear, blue, yellow, or black to provide corrosion resistance and meet various environmental requirements.
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