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Galvanized Butterfly and Union Bolts, Grade 4.8 & 8.8 - China Suppliers & Factory Quality Fasteners
| 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 | |
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Applications of Butterfly Screws
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. It has a wide range of applications, including but not limited to:
- 1Display industry: for fixed display components.
- 2Automobile industry: for the need for insulation and frequent dismantling and maintenance of automotive components.
- 3Aerospace industry: Used in electronic equipment on the insulation and anti-interference treatment.
- 4Office equipment industry: for the production of never rust and beautiful practical office equipment.
- 5Furniture assembly: for the fixed sofa, bed, wardrobe and cabinets and other furniture, to ensure stability and firmness, while easy to remove and adjust.
- 6Lamp installation: for fast and convenient fixed lamps, reducing the need for tools.
- 7Home decoration applications: for wall decoration fixed, home ornaments hanging, murals and clock installation.
- 8Construction Field: suitable for the fixing and installation of buildings, such as furniture, wall hangings and decorations.
💡The oil resistance and chemical resistance of butterfly screws make them suitable for use as mechanical materials, but they need to pay attention to their hygroscopicity, because moisture may reduce the tensile strength of nylon, permeability and improve ductility, impact strength and energy absorption properties. In injection molding, carbon black can be added to improve the outdoor weather resistance of nylon, so that it can still work under high temperature environment.
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Product Details:
- ✔ Thread is deep, tooth pitch is even, when using the force is even fastening force is good.
- ✔ Products smooth no burr, delicate work is difficult to use.
- ✔ Raw materials strictly control, exquisite grinding, high hardness.
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Frequently Asked Questions
Q
What is a butterfly screw and how does it differ from a regular screw?
A butterfly screw features a large, wing-shaped head that allows for hand-tightening without any tools. Unlike regular screws that require a screwdriver or wrench, butterfly screws provide a larger lateral force surface, making them ideal for applications that require frequent assembly and disassembly by hand.
Q
What are galvanized butterfly screws made from, and why are they galvanized?
Galvanized butterfly screws are made from steel that has undergone a zinc-coating (galvanization) process. This coating significantly enhances corrosion and rust resistance, making them suitable for outdoor use, humid environments, and applications where long-term durability is required without rusting.
Q
How does moisture affect nylon butterfly screws?
Moisture can affect the properties of nylon butterfly screws due to their hygroscopicity. Absorbed moisture may reduce tensile strength and permeability, while simultaneously increasing ductility, impact strength, and energy absorption. For high-humidity or wet environments, it is important to account for these property changes when selecting and applying nylon butterfly screws.
Q
How do I choose the right size butterfly screw for my application?
Selecting the right size depends on the load requirements, material thickness, and the level of clamping force needed. Butterfly screws are available in nominal diameters from 10# (0.19") to 5/8" (0.625"). Refer to the specification table above for detailed dimensions including thread pitch (PP), head diameter (dᵢ), head height (k), and available length range (L) to match your specific requirements.
Q
Can butterfly screws be used in outdoor or high-temperature environments?
Yes. For outdoor applications with nylon butterfly screws, carbon black can be added during the injection molding process to improve weather resistance, allowing them to perform reliably under prolonged UV exposure and high-temperature conditions. For more demanding outdoor environments, galvanized steel butterfly screws offer superior corrosion protection.
Q
What industries most commonly use butterfly screws?
Butterfly screws are widely used across many industries including the display industry, automotive industry, aerospace, office equipment manufacturing, furniture assembly, lighting installation, home decoration, and construction. Their tool-free, hand-operated design makes them especially popular in any application where fast, frequent adjustment or maintenance is needed.