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Galvanized Butterfly Bolts & Union Bolts - Grade 4.8 & 8.8 | 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 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.
🔩 Applications
- 1 Display Industry: For fixed display components.
- 2 Automobile Industry: For the need for insulation and frequent dismantling and maintenance of automotive components.
- 3 Aerospace Industry: Used in electronic equipment on the insulation and anti-interference treatment.
- 4 Office Equipment Industry: For the production of never rust and beautiful practical office equipment.
- 5 Furniture Assembly: For the fixed sofa, bed, wardrobe and cabinets and other furniture, to ensure stability and firmness, while easy to remove and adjust.
- 6 Lamp Installation: For fast and convenient fixed lamps, reducing the need for tools.
- 7 Home Decoration: For wall decoration fixed, home ornaments hanging, murals and clock installation.
- 8 Construction 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.
🏷️ Product Details
- ✔ Thread is deep, tooth pitch is even; when using, the force is even and fastening force is good.
- ✔ Products are smooth with no burr; delicate workmanship is difficult to replicate.
- ✔ Raw materials are strictly controlled; exquisite grinding ensures high hardness.
❓ Frequently Asked Questions
Q
What is a butterfly screw and how does it work?
A butterfly screw (also known as a thumb screw or wing screw) is a fastener designed for hand-tightening without tools. Its wide lateral wings provide a larger gripping surface, allowing users to apply even fastening force quickly and efficiently by hand.
Q
What sizes are available for galvanized butterfly screws?
Galvanized butterfly screws are available in nominal diameters ranging from 10# (0.19") up to 5/8" (0.625"), covering a wide range of thread pitches and dimensional tolerances to suit various industrial and domestic applications.
Q
Are butterfly screws suitable for outdoor use?
Yes. When made from galvanized or nylon materials with added carbon black, butterfly screws can resist outdoor weather conditions and high-temperature environments. The galvanized coating provides additional corrosion protection for exterior applications.
Q
What industries commonly use butterfly screws?
Butterfly screws are widely used across multiple industries including display manufacturing, automotive, aerospace, office equipment, furniture assembly, lighting installation, home decoration, and general construction. Their tool-free design makes them ideal for applications requiring frequent assembly and disassembly.
Q
Does moisture affect the performance of butterfly screws?
For nylon butterfly screws, hygroscopicity is an important consideration. Moisture absorption can reduce tensile strength and permeability while increasing ductility and impact strength. It is recommended to store them in a dry environment and consider galvanized or metal variants for high-moisture applications.
Q
What quality standards do these butterfly screws meet?
These butterfly screws feature deep threads with uniform tooth pitch for consistent fastening force, smooth burr-free surfaces for safe handling, and are produced from strictly controlled raw materials with precision grinding to ensure high hardness and reliable performance.