Flange nuts are specialized fastening components featuring a flat, circular base (flange) integrated with the nut body. This design provides a larger bearing surface area compared to standard nuts, distributing clamping forces more evenly, reducing the risk of surface damage, and enhancing resistance to loosening caused by vibrations. Widely used in automotive, plumbing, and industrial machinery, flange nuts combine secure fastening with improved stability, making them ideal for applications where precision and reliability are critical.
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Standard
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Country/Region
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Description
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ISO 6177
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International
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Specifies dimensions, tolerances, and mechanical properties of flange nuts
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DIN 6923
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Germany
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Defines metric flange nuts, detailing thread sizes, flange diameters, and strength classes
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ASME B18.2.2
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USA
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Covers unified inch series flange nuts, including thread and flange specifications
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GB/T 6177 - 2016
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China
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Details product requirements for flange nuts used in mechanical assemblies
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JIS B 1187
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Japan
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Japanese standard for flange nuts, focusing on dimensional accuracy and material grades
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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
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General household applications, light-duty machinery
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8.8
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Medium-carbon steel (e.g., 45# steel)
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800
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Automotive components, industrial equipment with moderate loads
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10.9
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Alloy steel (e.g., 35CrMo)
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1000
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Heavy machinery, construction equipment, high-stress applications
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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 (food processing, indoor humid areas)
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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 applications, chemical plants, and coastal infrastructure
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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 (clear, blue, or yellow finishes), suitable for indoor 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 environments
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Black Oxide Coating
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Black
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Creates a non-reflective surface with moderate rust resistance for internal components
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Dacromet Coating
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Dacromet
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Chromium-free, high-performance coating offering excellent corrosion 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 protection for visible parts
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Passivation (Stainless Steel)
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-
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Improves corrosion resistance by forming a protective oxide layer on stainless steel nuts
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