Long nuts, also known as extended or elongated nuts, are specialized fasteners characterized by their significantly increased length compared to standard nuts. This extended thread engagement offers enhanced strength, stability, and vibration resistance, making them ideal for applications that demand high load-bearing capacity and reliable connections over extended lengths. Widely used in construction, automotive, aerospace, and heavy machinery industries, long nuts ensure secure fastening in scenarios where conventional nuts may not provide sufficient grip or durability.
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Standard
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Country/Region
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Description
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ISO 4035
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International
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Specifies general requirements for long nuts, covering dimensions and tolerances
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DIN 439
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Germany
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Defines dimensions and mechanical properties of thin long nuts with metric threads
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ASME B18.2.2
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USA
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Covers unified inch series long nuts, detailing thread specifications and types
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GB/T 812 - 2018
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China
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Details product specifications for metric long nuts used in mechanical assemblies
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JIS B 1185
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Japan
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Japanese standard for long nuts, including dimensional 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 household items, light-duty mechanical assemblies
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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 with moderate load demands
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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 with high vibration
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10
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Alloy steel (e.g., 35CrMo)
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1000
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Heavy-duty machinery, construction equipment
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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 applications in aerospace and heavy trucks
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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 like marine, food processing
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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, such as chemical plants
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Nylon / Plastic
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Nylon 6/6, Polypropylene
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-
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Electrical insulation, reducing vibration and noise
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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 finishes for general use
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Hot-Dip Galvanizing
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HDG
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Superior corrosion resistance, ideal for outdoor and heavy-industrial applications
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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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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 parts
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Chromium Plating
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Cr
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Improves hardness, wear resistance, and corrosion resistance for enhanced durability
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