Wing nut is a manual nut with wing-shaped ears, allowing it to be tightened or loosened by hand without tools. It is commonly used in scenarios requiring frequent disassembly, such as mechanical equipment, furniture, and pipelines.
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Standard
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Country/Region
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Description
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ISO 3376
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International
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General standard for butterfly nuts
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DIN 315
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Germany
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Heavy-duty butterfly nuts (carbon steel/stainless steel)
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ASME B18.2.6
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USA
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Unified thread butterfly nuts
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GB/T 62.1-2004
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China
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Standard-type butterfly nuts (carbon steel)
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GB/T 62.2-2004
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China
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Light-duty butterfly nuts (aluminum alloy/plastic)
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Grade
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Material
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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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General machinery, furniture
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8.8
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Medium-carbon steel (e.g., 45# steel)
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Moderate-strength industrial scenarios
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A2-70 (Stainless Steel)
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304 stainless steel
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Corrosion-resistant environments (chemical industry, marine)
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A4-80 (Stainless Steel)
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316 stainless steel
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High-corrosion/high-temperature environments
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Aluminum Alloy/Plastic
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Aluminum alloy/nylon/PP
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Lightweight or insulated scenarios
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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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Rust prevention (blue-white zinc/yellow zinc)
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Hot-Dip Galvanizing
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HDG
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High corrosion resistance (outdoor/heavy industry)
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Black Oxide Coating
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Black
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Aesthetic + mild rust prevention (indoor equipment)
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Nickel Plating
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Ni
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Corrosion resistance + bright surface
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Dacromet Coating
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Dacromet
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Chromium-free environmental rust prevention (high-end industry)
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Natural (Stainless Steel)
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-
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Natural surface (corrosion-resistant)
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