Hexagon bolts are a widely-used type of fastener, characterized by their six-sided head, which allows for easy tightening and loosening with wrenches or sockets. They play a crucial role in numerous industries, including construction, automotive, machinery manufacturing, and general assembly, due to their reliability and versatility in joining components.
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Standard
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Country/Region
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Description
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ISO 4014 / ISO 4017
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International
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General-purpose hexagon bolts and high-strength hexagon bolts respectively
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DIN 931 / DIN 933
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Germany
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Defines dimensions and requirements for hexagon head bolts and screws
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ASME B18.2.1
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USA
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Specifies unified inch series hexagon bolts
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GB/T 5782 / GB/T 5783
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China
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Covers product specifications for hexagon head bolts with different thread lengths
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JIS B 1180
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Japan
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Japanese standard for hexagon bolts
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Grade
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Material
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Tensile Strength (MPa)
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Application Scenarios
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4.6
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Low-carbon steel (e.g., Q215)
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400/240
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General assembly, non-critical applications
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4.8
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Low-carbon steel (e.g., Q235)
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400/320
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Common machinery, household products
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8.8
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Medium-carbon steel (e.g., 45# steel)
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800/640
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Automotive, industrial equipment, structural connections
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10.9
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Alloy steel (e.g., 35CrMo, 42CrMo)
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1000/900
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High-strength applications, heavy machinery
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12.9
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Alloy steel (e.g., 20MnTiB)
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1200/1080
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Extreme-load scenarios, aerospace, high-performance engines
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A2-70 (Stainless Steel)
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304 stainless steel
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700
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Corrosion-resistant environments (marine, chemical)
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A4-80 (Stainless Steel)
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316 stainless steel
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800
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High-corrosion and high-temperature applications
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Treatment Method
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Abbreviation
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Description
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Zinc Plating
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Zn
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Provides basic rust protection; available in blue, yellow, or white finishes
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Hot-Dip Galvanizing
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HDG
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Offers superior corrosion resistance, ideal for outdoor and heavy-duty use
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Electro-galvanizing
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EG
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Thin, uniform zinc coating for aesthetic purposes and light corrosion protection
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Black Oxide Coating
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Black
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Creates a black, non-reflective surface with mild rust resistance; common in internal machinery
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Dacromet Coating
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Dacromet
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Environmentally friendly, chromium-free coating with high corrosion resistance
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Geomet Coating
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Geomet
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Similar to Dacromet, providing long-lasting protection and excellent anti-galling properties
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Nickel Plating
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Ni
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Enhances appearance and offers moderate corrosion resistance for decorative applications
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