Product Details

This product is a DIN985 standard grade 4/8 nylon lock nut, also known as a self-locking nut. It is a core component for seismic and vibration-resistant steel structures and for fastening vibrating equipment. It features a built-in high-elasticity nylon ring as its core anti-loosening structure. Made from high-quality carbon steel through precision machining, it strictly adheres to German standard production standards. The nylon ring fits the nut precisely, without detachment or deformation, and the thread precision meets standards, resulting in a tight fit. During tightening, the nylon ring compresses the bolt threads, creating a continuous self-locking friction force that effectively resists the forces of wind vibration, earthquakes, and equipment vibration in steel structure projects, completely solving the problem of loosening common nuts. The product surface is electro-galvanized for corrosion protection, providing excellent rust resistance. The nylon ring is resistant to aging and high and low temperatures, making it suitable for various vibration conditions. Each batch undergoes thread precision and locking force testing, ensuring stable quality. It is the preferred nut for seismic and anti-loosening fastening of steel structure plants, bridges, heavy equipment, photovoltaic supports, etc.

Core Technical Parameters

Material: Q235 carbon steel (grade 4), 45# carbon steel (grade 8)
Strength Grade: Grade 4, Grade 8 (optional)
Surface Treatment: Electro-galvanized
Thread Specifications: M6, M8, M10, M12, M16, M20, M24 (Regular stock, all DIN985 specifications)
Testing Standards: Locking force, thread accuracy, and dimensional tolerances all meet German standard DIN985 and Chinese standard GB/T 889.1 requirements.

Core Application Scenarios

Seismic fastening of steel structure workshops, anti-loosening connection of bridge steel structure nodes, fastening of vibrating parts of heavy industrial equipment, seismic installation of photovoltaic brackets, connection of secondary components of high-rise building steel structures, and fastening of fans/motors.

Compatible Standards & Recommended Matching Components

Execution Standards: German standard DIN985, Chinese standard GB/T 889.1
Recommended Matching Components: Grade 8.8 internal/external hex bolts, Grade 10.9 fully threaded studs (best combination for seismic and anti-loosening, one-stop solution)