Countersunk head bolts, recognized by their conical-shaped heads designed to sit flush with the surface of the material when installed, offer both aesthetic appeal and functional advantages. This unique profile minimizes protrusion, reducing the risk of snagging or damage, making them ideal for applications where a smooth surface finish is required, such as furniture, electronics, and architectural fixtures.
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Standard
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Country/Region
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Description
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ISO 7380
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International
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Specifies dimensions and requirements for countersunk head bolts with metric threads
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DIN 963 / DIN 965
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Germany
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Defines high-strength and standard-strength countersunk head bolts respectively
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ASME B18.3
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USA
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Covers socket head cap screws, including countersunk variants in unified series
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GB/T 819.1 - 2000
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China
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Details product specifications for countersunk head slotted screws
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JIS B 1111
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Japan
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Japanese standard for countersunk head bolts with specific dimensional tolerances
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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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4.8
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Low-carbon steel (e.g., Q235)
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400/320
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General assembly in household products and light fixtures
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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 interior components and general machinery
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10.9
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Alloy steel (e.g., 35CrMo)
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1000/900
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High-stress applications in industrial equipment
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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 applications like kitchen appliances
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A4-80 (Stainless Steel)
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316 stainless steel
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800
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Marine environments and chemical processing equipment
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Aluminum Alloy
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6061 aluminum
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276
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Lightweight structures in aerospace and consumer electronics
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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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Basic rust protection, available in clear, blue, or yellow finishes
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Electroplating
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-
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Deposits a thin, uniform layer, enhancing appearance and light corrosion resistance
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Anodizing (for Aluminum)
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-
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Increases surface hardness and corrosion resistance of aluminum bolts, available in multiple colors
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Passivation (for Stainless Steel)
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-
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Forms a protective oxide layer to improve corrosion resistance
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Powder Coating
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-
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Provides a durable, decorative finish with good abrasion and chemical resistance
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Black Oxide Coating
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Black
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Creates a non-reflective, black surface with moderate rust resistance, suitable for internal components
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