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China Suppliers Factory Galvanized Butterfly Bolts & Union Bolts Grade 4.8 and 8.8 for Easy Assembly and Maintenance
| 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. It has a wide range of applications, including but not limited to:
🔧 Application Areas
🖼️
Display IndustryFor fixed display components.
🚗
Automobile IndustryFor insulation and frequent dismantling and maintenance of automotive components.
✈️
Aerospace IndustryUsed in electronic equipment for insulation and anti-interference treatment.
📷
Office EquipmentFor production of rust-free and beautiful practical office equipment.
🪑
Furniture AssemblyFor fixing sofa, bed, wardrobe and cabinets, ensuring stability while easy to remove and adjust.
💡
Lamp InstallationFor fast and convenient lamp fixing, reducing the need for tools.
🏠
Home DecorationFor wall decoration, home ornaments hanging, murals and clock installation.
🏗️
Construction FieldFor fixing and installation of buildings, wall hangings and decorations.
ℹ️
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.
⭐ Product Details
✅
Thread is deep, tooth pitch is even; when using the force is even, fastening force is good.
✅
Products are smooth with no burrs; delicate craftsmanship ensures ease of use.
✅
Raw materials strictly controlled; exquisite grinding ensures high hardness and durability.
❓ Frequently Asked Questions
Q
What is a butterfly screw and how does it work?
A butterfly screw is a type of fastener with a wing-shaped head that allows it to be tightened and loosened entirely by hand, without any tools. Its wider lateral surface distributes grip force more effectively, making the tightening operation faster and more efficient than standard screws.
Q
What makes galvanized butterfly screws resistant to corrosion?
Galvanized butterfly screws are coated with a zinc layer through a galvanization process, which acts as a sacrificial barrier against rust and oxidation. This makes them especially suitable for environments with moisture exposure, such as outdoor construction, furniture assembly, and lamp installation.
Q
What thread sizes are available for butterfly screws?
Butterfly screws are available in a range of nominal diameters: #10, 1/4", 5/16", 3/8", 7/16", 1/2", and 5/8". Each size has defined specifications for thread pitch (PP), head diameter (dk), head height (k), and overall length (L), as detailed in the specification table above.
Q
Can butterfly screws be used in high-temperature or outdoor environments?
Yes. For nylon butterfly screws used outdoors, carbon black can be incorporated during injection molding to improve UV resistance and weather durability, allowing them to perform reliably even under high-temperature conditions. For outdoor or structural use, galvanized steel variants are recommended for superior strength and corrosion resistance.
Q
Are butterfly screws suitable for applications requiring frequent disassembly?
Absolutely. Their tool-free design makes butterfly screws ideal for any scenario requiring regular assembly and disassembly — including automotive maintenance panels, adjustable furniture, lamp fixtures, and electronic equipment housings. They significantly reduce service time compared to conventional fasteners.
Q
How do I select the correct butterfly screw size for my application?
Choose the size based on your application's hole diameter, required clamping force, and material thickness. Refer to the specification table above for the dimensional data of each nominal size. For lightweight or decorative applications (home decor, office equipment), smaller sizes such as #10 or 1/4" are typically sufficient. For heavier structural uses (furniture, construction), consider 3/8" or larger.