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View M5 304 SS A2-70 METAL BOLT Carriage Bolt Passivated Round Head Square Neck Demo

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December 18, 2025
Category Connection: Metal Bolt
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Tags:
#Carbon Steel Bolt #U Shape Bolt #Metric Threaded Rod
Brief: From concept to demonstration, this video highlights the evolution and practical outcomes of the M5 304 SS A2-70 Carriage Bolt. You'll see a detailed walkthrough of its manufacturing process, from cold forging to passivation, and witness its application in real-world scenarios like playground installations and industrial machinery, showcasing how the square neck design enables efficient one-worker assembly.
Related Product Features:
  • Cold-forged M5 blank thread-rolled after solution annealing for a smooth 6g flank that increases fatigue strength by 30%.
  • Passivation process removes free iron, leaving a satin chrome finish that resists print corrosion in humid environments.
  • Large half-round head sits flush in applications like playground hand-rail inserts for enhanced safety and aesthetics.
  • Square neck bites into a 6.2 mm punched hole, allowing one worker to tighten the nut from below the deck.
  • No sharp edges, meeting EN 1176 safety code requirements for playground and architectural applications.
  • A2-70 grade offers 700 MPa tensile strength for high-stress applications in automotive and mechanical industries.
  • 50 µm chrome-oxide film provides corrosion resistance for up to 800 hours in salt-spray tests.
  • Designed to reduce life-cycle costs compared to painted screws through superior durability and corrosion resistance.
Faqs:
  • What industries are these carriage bolts suitable for?
    These bolts are designed for automotive, mechanical, energy, and architectural industries, including applications in engines, heavy-duty machinery, power generation equipment, building structures, and playground installations.
  • How does the square neck design benefit installation?
    The square neck bites into a 6.2 mm punched hole, preventing the bolt from rotating during assembly. This allows one worker to tighten the nut from below the deck, improving installation efficiency.
  • What corrosion resistance does this bolt offer?
    The passivation process creates a 50 µm chrome-oxide film that provides resistance for up to 800 hours in salt-spray tests, making it ideal for humid workshops and outdoor applications.
  • Does this bolt meet any safety standards?
    Yes, the bolt has no sharp edges and meets the EN 1176 safety code, making it suitable for playground equipment and other applications where user safety is paramount.
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