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Galvanized Butterfly Bolts & Union Bolts - Grade 4.8 & 8.8 from China Suppliers & Factory
📐 Dimensional Specifications
| Nominal diameter d | 10# | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 5/8 | |
| d | 0.19 | 0.25 | 0.3125 | 0.375 | 0.4375 | 0.5 | 0.625 | |
| PP | 24 | 20 | 18 | 18 | 14 | 13 | 11 | |
| n | Max | 0.97 | 1.16 | 1.44 | 1.72 | 2 | 2.31 | 2.84 |
| Min | 0.91 | 1.09 | 1.38 | 1.66 | 1.94 | 2.22 | 2.72 | |
| H | Max | 0.45 | 0.56 | 0.67 | 0.8 | 0.91 | 1.06 | 1.31 |
| Min | 0.39 | 0.5 | 0.61 | 0.73 | 0.84 | 0.94 | 1.19 | |
| h | Max | 0.15 | 0.17 | 0.18 | 0.2 | 0.21 | 0.23 | 0.27 |
| Min | 0.12 | 0.14 | 0.15 | 0.17 | 0.18 | 0.2 | 0.23 | |
| dk | Max | 0.39 | 0.47 | 0.55 | 0.63 | 0.71 | 0.79 | 0.96 |
| Min | 0.36 | 0.44 | 0.52 | 0.6 | 0.68 | 0.76 | 0.92 | |
| k | Max | 0.28 | 0.34 | 0.41 | 0.47 | 0.53 | 0.62 | 0.75 |
| Min | 0.22 | 0.28 | 0.34 | 0.41 | 0.47 | 0.5 | 0.62 | |
| L | Max | 2 | 3 | 3 | 4 | 3 | 3 | 2.5 |
| Min | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 | |
✦ Butterfly Screw (also called Wing Screw) is a hand-operated fastener featuring a larger lateral force surface, enabling more efficient tightening without tools. It is widely used across multiple industries.
🔩 Application Areas
1
Display Industry: Used for fixing display components securely and efficiently.
2
Automobile Industry: Ideal for insulation and frequently dismantled automotive components requiring easy maintenance.
3
Aerospace Industry: Applied in electronic equipment for insulation and anti-interference treatment.
4
Office Equipment Industry: Used in the production of rust-free and aesthetically appealing office equipment.
5
Furniture Assembly: Suitable for fixing sofas, beds, wardrobes, and cabinets — ensuring stability while allowing easy removal and adjustment.
6
Lamp Installation: Enables fast and convenient fixture mounting, reducing the need for tools.
7
Home Decoration: Used for wall decoration, hanging ornaments, murals, and clock installation.
8
Construction Field: Suitable for fixing and installing building elements such as furniture, wall hangings, and decorations.
⚠️
Material Note: The oil resistance and chemical resistance of butterfly screws make them suitable as mechanical materials. Attention should be paid to their hygroscopicity — moisture may reduce tensile strength while improving ductility, impact strength, and energy absorption. In injection molding, carbon black can be added to enhance outdoor weather resistance, allowing the screws to perform reliably in high-temperature environments.
⭐ Product Details
- ✔ Thread is deep and tooth pitch is even — providing uniform fastening force for reliable performance.
- ✔ Products are smooth with no burrs — refined craftsmanship ensures a clean and professional finish.
- ✔ Raw materials are strictly controlled with exquisite grinding, resulting in high hardness and durability.
❓ Frequently Asked Questions
Q
What is a butterfly screw and how does it differ from a regular screw?
A butterfly screw (also known as a wing screw) features two large wing-shaped projections on its head, allowing it to be tightened and loosened by hand without any tools. Unlike regular screws that require a screwdriver, butterfly screws are designed for quick, tool-free operation.
Q
What materials are butterfly screws typically made from?
Butterfly screws are commonly made from nylon (plastic), stainless steel, or galvanized steel. Nylon variants offer excellent chemical resistance and insulation properties, while galvanized steel versions provide superior strength and corrosion resistance for heavy-duty applications.
Q
What sizes are available for butterfly screws?
Butterfly screws are available in a range of nominal diameters including #10, 1/4", 5/16", 3/8", 7/16", 1/2", and 5/8". Length options vary by diameter, with maximum lengths ranging from 2.5" to 4" depending on the size selected.
Q
Are butterfly screws suitable for outdoor use?
Yes. Galvanized butterfly screws are well-suited for outdoor applications due to their corrosion-resistant coating. For nylon butterfly screws, carbon black can be added during injection molding to improve UV and weather resistance, making them functional in high-temperature outdoor environments.
Q
Can butterfly screws be used in furniture assembly?
Absolutely. Butterfly screws are widely used in furniture assembly for fixing sofas, beds, wardrobes, and cabinets. Their tool-free design makes them ideal for furniture that needs to be frequently disassembled, adjusted, or relocated.
Q
What should I be aware of when using nylon butterfly screws in humid environments?
Nylon butterfly screws are hygroscopic, meaning they can absorb moisture from the environment. This may reduce their tensile strength over time while increasing ductility and impact resistance. In highly humid conditions, it is recommended to use galvanized or stainless steel butterfly screws for better structural reliability.