Slotted nuts are specialized fastening components featuring radial slots cut into the top of the nut, designed to enhance security by preventing unintentional loosening. These slots align with holes drilled through the bolt or stud, allowing a split pin (cotter pin) or a wire to be inserted, creating a mechanical lock that withstands vibrations and dynamic loads. Widely utilized in automotive engines, heavy machinery, aerospace assemblies, and other high-stress applications, slotted nuts ensure reliable connections in environments where standard nuts may fail due to constant movement or shock.
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Standard
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Country/Region
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Description
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ISO 4034
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International
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Specifies dimensions, tolerances, and mechanical properties of slotted hex nuts
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DIN 936
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Germany
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Defines slotted nuts with metric threads, detailing slot depth and alignment
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ASME B18.2.2
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USA
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Covers unified inch series slotted nuts, including thread and slot specifications
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GB/T 6178 - 1986
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China
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Details product requirements for slotted hex nuts used in industrial machinery
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JIS B 1180
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Japan
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Japanese standard for slotted nuts, specifying dimensional and strength ratings
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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 applications in light-duty 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 with moderate vibration
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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 drivetrains, engines, and suspension systems
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10
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Alloy steel (e.g., 35CrMo)
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1000
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Heavy machinery, construction cranes, and high-load applications
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12
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Alloy steel (e.g., 40Cr)
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1200
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Aerospace components, military vehicles, 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 like food processing 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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Marine vessels, chemical plants, and high-corrosion settings
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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) for indoor applications
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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 use
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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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