Cap & Acorn Nuts vs. Wing Nuts
Comparing 2 standards across 9 specifications. 9 key differences identified.
Cap and Acorn nuts (standardized under DIN 1587 and ASME B18.2.2) feature a domed, blind-ended crown that completely encloses the protruding end of a mating screw or threaded rod. They prevent snagging on clothing, protect exposed threads from corrosion and moisture, and provide a finished decorative appearance on consumer goods, bicycles, and furniture.
The Wing Nut (Butterfly Nut, standardized under DIN 315 and ASME B18.6.9) features two large ergonomic metallic side projections ("wings") extending vertically from the central threaded boss. Designed for rapid, tool-free tightening and loosening by hand, it is the standard fastener on stage lighting C-clamps, drum set cymbal stands, and battery terminals.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
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Standard Specifications
|
DIN 1587 (High type dome) / DIN 917 (Low profile cap) / ASME B18.2.2 | DIN 315 (Type D ductile cast / Type F forged) / ASME B18.6.9 (Type A/B/C) |
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Common Materials
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A2/A4 Stainless steel, solid brass, chrome-plated steel, black oxide steel | Stainless steel (A2/A4), zinc-plated malleable iron, brass, nylon plastic |
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Primary Applications
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Bicycle axle hubs, motorcycle engine covers, outdoor playground structures, furniture | Drum kits (cymbal stands), stage theatrical lighting clamps, air filter covers, marine battery terminals |
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Dome Profile
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Hemispherical blind cap permanently enclosing internal tapped threads | — |
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Safety Function
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Eliminates sharp exposed screw threads that cause lacerations or fabric snags | — |
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Environmental Protection
|
Seals internal thread engagement from weather, road salt, and industrial grime | — |
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Wing Geometry
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— | Two opposing curved radial wings for manual two-finger leverage |
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Tightening Method
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— | 100% Tool-free manual finger tightening |
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Clamping Torque Limitation
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— | Low manual torque (~1.5 to 5 N·m depending on finger grip strength) |