The Wing Nut (commonly known as a butterfly nut, hand-tightening nut, thumb nut, or DIN 315 fastener) is a specialized internally threaded fastener featuring two ergonomic metal wings (side flaps) extending outward from the central hub. Designed specifically for rapid manual assembly and frequent disassembly without needing wrenches or power tools, the wing geometry allows operators to apply finger torque directly. Manufactured in carbon steel (Property Class 4) and austenitic stainless steel (SS304/A2-70 and SS316/A4-80), our wing nuts comply strictly with global ISO standards.
Technical Specifications of Wing Nuts (Butterfly Nuts)
We supply both German DIN 315 heavy cold-forged wing nuts and American light stamped sheet metal wing nuts across various material choices and protective coatings. Smooth wing contours ensure comfortable manual operation without sharp edges.
| Property Class / Grade | Raw Material Base | Proof Load Stress | Manufacturing Execution | Available Surface Treatments |
|---|---|---|---|---|
| Class 4 Carbon Steel | Low Carbon Steel (Q195 / Q235B) | 400 N/mm² (400 MPa) | Cold Forged Solid Wings / Stamped Sheet Wings | Electro-Zinc Plated (Blue-White / Yellow), HDG |
| Stainless A2-70 / A2-80 | Austenitic Stainless Steel SS304 (1.4301) | 700 – 800 N/mm² | Precision Investment Cast / Cold Forged | Passivated Clean Natural / Electropolished |
| Stainless A4-70 / A4-80 | Austenitic Stainless Steel SS316 (1.4401) | 700 – 800 N/mm² | Precision Investment Cast / Cold Forged | Passivated Clean Natural / Electropolished |
Precision Cold Forging and Wing Forming Process
At our manufacturing plant in Handan, China, wing nuts undergo multi-station cold forming, precision internal thread tapping, barrel deburring, and protective electroplating:
- Multi-Station Cold Forging: Advanced automatic cold heading machinery presses carbon steel wire rod into symmetrical wing shapes in a single continuous die stroke, establishing high grain density and mechanical toughness.
- Rotary Barrel Deburring: Forged wing bodies pass through ceramic media tumbling barrels to round off sharp edges, creating a comfortable grip surface for finger tightening.
- Precision Internal Tapping: High-speed tapping units thread metric 6H internal pitches, ensuring low manual driving friction and smooth thread engagement.
- Surface Galvanizing & Chemical Passivation: Electro-zinc plating (5–12 µm) or chemical acid passivation for stainless steel items to deliver long-term corrosion resistance.
Versatile Industrial Applications of Wing Nuts
Wing nuts serve as essential quick-release fasteners across commercial, industrial, and consumer equipment:
- Stage Lighting & Audio Truss Equipment: Fastening spotlight clamps, microphone stands, drum hardware, and stage rigging components requiring rapid setting adjustments.
- HVAC & Filter Housing Maintenance Cover: Securing air duct filter doors, dust collector access panels, and pressure vessel hatches requiring frequent cleaning.
- Temporary Scaffolding & Formwork Brackets: Securing quick-adjust clamps, battery terminal connectors, and outdoor camping equipment.
Quality Assurance and Export Packaging for Wing Nuts
Handan YiHao Fastener enforces strict Quality Assurance (QA) standards for all overseas export orders. Testing procedures include 100% thread plug gauge go/no-go checks, wing symmetry and height measurement, manual torque proof testing, and salt spray validation.
All export orders are bulk packed in heavy-duty 25kg inner cartons, neatly stacked on ISPM 15 compliant fumigated wooden pallets, and wrapped in protective stretch film for safe ocean freight.
Request Factory Direct Pricing for Wing Nuts
Looking for a trusted manufacturer in Handan, China for carbon steel or stainless steel wing nuts / butterfly nuts (Class 4, A2-70, DIN 315 / GB/T 62)? Contact Handan YiHao Fastener today for technical datasheets, heavy forged vs light stamped options, free samples, and direct bulk export quotes.
