DIN 6796 Disc Spring Washer: Active Anti-Loosening Solution for Bolted Connections
Under operating conditions with vibration, impact, and temperature variations, bolt connection loosening represents a common equipment failure risk. The DIN 6796 disc spring washer is an active anti-loosening component designed for medium and high-load bolt connections. This conical elastic washer stores elastic potential energy during bolt pre-tightening and continuously provides stable pre-tightening force, effectively compensating for clamping force loss from vibration, wear, creep, and thermal expansion.
Understanding DIN 6796 Disc Spring Washers
DIN 6796 is a German standard for disc-shaped elastic washers with conical angles. Unlike conventional flat washers or standard elastic washers, the DIN 6796 washer undergoes axial elastic deformation during bolt tightening, converting tightening torque into elastic potential energy that provides continuous axial preload to bolted connections.
This design enables active anti-loosening capability: when vibration, wear, or material creep reduces clamping force, the washer utilizes elastic rebound to restore preload, maintaining sufficient clamping force. In most applications, it serves as an upgraded alternative to traditional "flat washer + standard elastic washer" combinations, simplifying assembly and enhancing connection reliability.
Core Performance Advantages
- Superior Loosening Resistance: Tested per DIN 25201-4 transverse vibration standard, M10 specification maintains 75.67% clamping force retention rate – approximately 1.59 times better than traditional washer combinations
- Elastic Pre-tensioning Maintenance: Conical design continuously applies axial pre-tensioning force, compensating for clamping force reduction from material creep, temperature fluctuations, or seal compression
- Heavy-Load Compatibility: Force applied when washer is flattened corresponds to 70–90% of tightening force required for 8.8 or 10.9-grade bolts
- Elastic Stability and Reliability: Manufactured from high-elasticity spring steels with hardness maintained at 420–510 HV for long-term anti-loosening and fracture resistance
- Diverse Surface Treatments: Options include blackening, electroplating, phosphating, zinc plating, mechanical galvanizing to meet various corrosion resistance requirements
Material Systems and Surface Treatments
Material selection directly influences elasticity, fatigue life, and corrosion resistance. Available materials include 1074 carbon steel, 51CrV4, 60Si2Mn, 65Mn, SUS302, SUS304, SUS316, 17-7PH, Inconel 718, and Inconel X-750 – covering applications from conventional industrial uses to specialized high-temperature and corrosive environments.
Surface treatment options include phosphating, Dakro coating, blue treatment, polishing, Jiemete treatment, passivation, and Teflon coating. Phosphating improves lubrication and corrosion resistance; Dakro coating enhances salt spray resistance; Teflon coating reduces friction coefficient.
Technical Specifications and Customization
DIN 6796 disc spring washers are available in standard size series for bolts M3 and larger. Custom manufacturing services accommodate non-standard sizes and special requirements. Key parameters including outer diameter, inner diameter, thickness, and conical angle can be tailored to specific applications, with load-deformation characteristic verification to ensure compatibility with assembly conditions.
Industrial Applications
DIN 6796 disc spring washers are widely used in industries with stringent bolt-loosening prevention requirements:
- Construction machinery (excavators, cranes, bulldozers) for secure fastening under severe vibration
- Automotive manufacturing for critical chassis and powertrain fastening points
- Wind power equipment for tower-nacelle connections under long-term alternating loads
- Heavy-duty structures in metallurgy, bridges, and shipbuilding
- Hydraulic sealing assemblies, valves, and pump equipment to compensate for compressive deformation and maintain stable sealing preload
Manufacturing Expertise
Jiangsu Sunzo Spring Elastic Technology Co., Ltd. specializes in elastic component manufacturing with investment from China National Nuclear Corporation's Industrial Fund. Established in 2006, the company focuses on research, development, production, and sales of disc springs and wave springs.
With certifications including ISO 9001 and IATF 16949, participation in national and international standard development, and over 30 invention patents, Sunzo provides comprehensive production capabilities covering annealing, forming, heat treatment, high-pressure forming, and automated sorting.
Leveraging large-scale production facilities and robust quality management, Sunzo supplies DIN 6796-compliant disc spring washers to construction machinery, automotive, wind power, nuclear power, and hydrogen energy industries, offering customized solutions and rapid prototyping services.
The reliability of bolted connections directly impacts equipment operational safety and maintenance costs. The DIN 6796 disc spring washer, with active anti-loosening and stable pre-tensioning properties, provides a reliable solution for heavy-load connections. Jiangsu Sunzo leverages expertise in materials, manufacturing processes, and design to deliver high-quality products and technical services.
