Square nuts are a type of fastening component distinguished by their four-sided, angular shape, which provides a large, flat surface for wrench or spanner application. This design allows for high torque during tightening, making them suitable for heavy-duty applications where strong, reliable connections are required. Their flat sides prevent rotation when seated against a surface, ensuring stability in fixed positions, and are often used in scenarios where quick adjustments or robust mechanical joins are necessary.
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Standard
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Country/Region
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Description
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ISO 4036
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International
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Specifies dimensions and requirements for square nuts in metric series
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DIN 555
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Germany
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Defines the characteristics, dimensions, and mechanical properties of square nuts
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ASME B18.2.2
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USA
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Covers square nuts in unified inch series, detailing thread and size specifications
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GB/T 39 - 2000
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China
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Details product specifications for square nuts used in mechanical and structural assemblies
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JIS B 1180
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Japan
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Japanese standard for square nuts, including dimensional tolerances and strength requirements
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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
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Low-carbon steel (e.g., Q235)
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400
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General-purpose assembly in non-critical applications, such as furniture and light machinery
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5
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Low-carbon steel (e.g., Q235)
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500
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Common industrial equipment and household fixtures
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8
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Medium-carbon steel (e.g., 45# steel)
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800
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Automotive components, industrial machinery, and structural connections
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10
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Alloy steel (e.g., 35CrMo)
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1000
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High-stress applications like heavy machinery, bridges, and heavy trucks
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12
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Alloy steel (e.g., 40Cr)
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1200
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Extreme-load scenarios in aerospace and 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, such as marine, food processing, and chemical plants
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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 settings, like coastal infrastructure and chemical reactors
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Nylon
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Nylon 6/6
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-
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Insulation, reducing vibration, and non-conductive 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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Basic rust protection; available in clear, blue, yellow, or black finishes, commonly used for general applications
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Hot-Dip Galvanizing
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HDG
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Superior corrosion resistance, ideal for outdoor, heavy-industrial, and long-term exposure scenarios
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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, often used for internal machinery components
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Dacromet Coating
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Dacromet
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Environmentally friendly, chromium-free coating offering high corrosion resistance and anti-galling properties
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Nickel Plating
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Ni
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Enhances appearance and provides moderate corrosion resistance for decorative or semi-exposed applications
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Electroplating
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-
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Deposits a thin, uniform layer for improved aesthetics and light corrosion protection
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