Custom DIN315 Butterfly Nuts Reliable Stainless Steel Brass Hand-Tightened Wing Nut

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What Are Butterfly Nuts?

Butterfly nuts, also known as wing nuts, are a type of fastener designed for hand-tightening without the need for tools. They feature two prominent “wings” on either side, allowing users to grip and rotate them easily. These nuts are commonly used in applications where frequent adjustments or quick assembly/disassembly are required.

Materials

Butterfly nuts are manufactured from various materials to suit different environmental and mechanical demands:

• Stainless Steel (A2/A4): Offers excellent corrosion resistance, making it ideal for outdoor or marine applications.

• Carbon Steel (Grade 4.8/8.8): Provides high strength and durability, often coated for additional protection.

• Brass: Used in electrical and decorative applications due to its corrosion resistance and aesthetic appeal.

• Nylon/Plastic: Lightweight and non-conductive, suitable for electrical insulation and low-load applications.

• Aluminum: Lightweight and corrosion-resistant, often used in aerospace and automotive industries.

Surface Treatments

To enhance performance and longevity, butterfly nuts undergo various surface treatments:

• Zinc Plating (Galvanized): Provides rust resistance for general-purpose use.

• Hot-Dip Galvanizing: Offers a thicker protective layer for harsh environments.

• Chrome Plating: Improves corrosion resistance and adds a polished look.

• Black Oxide: Enhances wear resistance and provides a sleek finish.

• Powder Coating: Adds color and extra protection against corrosion and chemicals.

• Passivation (for Stainless Steel): Removes free iron particles to improve corrosion resistance.

Specifications

Butterfly nuts come in various sizes and thread types to fit different applications:

• Thread Sizes: Ranging from M4 to M20 (metric) or #6 to 3/4″ (imperial).

• Wing Span: Typically 20mm to 100mm, depending on the size.

• Height: Varies with thread diameter, usually 5mm to 25mm.

• Standards: Compliant with DIN 315, ISO 7040, or ANSI B18.6.9.

Applications

Due to their ease of use, butterfly nuts are widely used in:

• Furniture Assembly: For adjustable parts like table legs or shelving.

• Automotive & Aerospace: Quick-access panels and lightweight fastening.

• Electrical Enclosures: Securing control panels without tools.

• Marine & Outdoor Equipment: Resistant to corrosion in wet environments.

• Stage & Lighting Rigging: Allows rapid adjustments in theatrical setups.

• DIY & Home Improvement: Ideal for temporary or adjustable fixtures.

Excellent Case: Adjustable Solar Panel Mounting System

Challenge:

A solar energy company needed a fastening solution for rooftop solar panels that allowed easy adjustments for optimal sun exposure while withstanding outdoor conditions.

Solution:

Stainless steel butterfly nuts (M12, A4 grade) were used to secure the mounting brackets. The wings enabled quick manual adjustments without tools, while the stainless steel material resisted corrosion from rain and UV exposure.

Result:

• Faster Installation & Maintenance: Technicians could tighten or loosen nuts quickly, reducing labor time.

• Durability in Harsh Weather: The nuts remained rust-free even after years of exposure.

• Cost-Effective Adjustments: No specialized tools were needed for seasonal panel angle changes.

This application demonstrated how butterfly nuts provide convenience, durability, and efficiency in renewable energy systems.