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Galvanized Butterfly Bolts & Union Bolts - Grade 4.8 & Grade 8.8 from China Suppliers and 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 Butterfly Screw, is a kind of screw designed to facilitate hand-screw operation, with a larger lateral force surface, so that tightening operation more efficient.
🔧 Application Areas
🖥️
Display Industry
Used for fixing display components securely and efficiently.
🚗
Automobile Industry
For insulation and frequent dismantling and maintenance of automotive components.
✈️
Aerospace Industry
Used in electronic equipment for insulation and anti-interference treatment.
🖨️
Office Equipment Industry
For production of rust-free and aesthetically practical office equipment.
🛋️
Furniture Assembly
Fixing sofas, beds, wardrobes and cabinets — stable, firm, and easy to adjust.
💡
Lamp Installation
Fast and convenient fixture mounting, reducing the need for tools.
🏠
Home Decoration
Wall décor, home ornaments, murals, and clock installation.
🏗️
Construction Field
Suitable for fixing furniture, wall hangings, and decorations in buildings.
⚠️
Material Notice: The oil resistance and chemical resistance of butterfly screws make them suitable as mechanical materials. However, attention should be paid to hygroscopicity — moisture may reduce tensile strength of nylon, while improving ductility, impact strength, and energy absorption. In injection molding, carbon black can be added to improve outdoor weather resistance, allowing use in high-temperature environments.
✅ Product Details
- ✔ Thread is deep and tooth pitch is even — uniform force application ensures excellent fastening performance.
- ✔ Smooth surface with no burrs — delicate workmanship for reliable and comfortable use.
- ✔ Raw materials strictly controlled with exquisite grinding — delivers 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 large wing-shaped protrusions on either side of the head, allowing it to be tightened and loosened by hand without any tools. Unlike standard screws that require a screwdriver, butterfly screws are designed for quick, tool-free operation.
Q
What materials are galvanized butterfly screws typically made from?
Galvanized butterfly screws are commonly made from carbon steel or stainless steel with a zinc (galvanized) coating applied to improve corrosion resistance. Some variants are also made from nylon or other engineering plastics for applications requiring insulation or lightweight properties.
Q
What size butterfly screw should I choose for my application?
The appropriate size depends on the load requirements and the material being fastened. Refer to the dimensional specification table above — sizes range from 10# (0.19") to 5/8" (0.625") in nominal diameter. For heavier loads, choose a larger diameter such as 1/2" or 5/8".
Q
Are butterfly screws suitable for outdoor use?
Yes. Galvanized butterfly screws are well-suited for outdoor applications due to their zinc coating, which provides corrosion protection. For nylon variants used outdoors, adding carbon black during injection molding significantly enhances UV and weather resistance.
Q
Can butterfly screws be reused multiple times?
Yes, one of the key advantages of butterfly screws is their reusability. They are specifically designed for applications that require frequent disassembly and reassembly, such as automotive maintenance panels, furniture adjustments, and equipment covers.
Q
How do I ensure a secure fit when using butterfly screws?
Ensure the thread pitch and nominal diameter match the receiving nut or threaded hole. Apply even hand pressure during tightening — the deep thread profile and uniform pitch of quality butterfly screws ensure a reliable, stable fastening. Avoid over-tightening, especially with nylon variants, as this can stress the wings.