English Views: 68 Author: Site Editor Publish Time: 2026-09-14 Origin: Site
Under operating conditions where vibration, impact, and temperature variations coexist, bolt connection loosening represents a common potential source of equipment failure. The DIN 6796 disc spring washer (also known as conical elastic washer or heavy-duty bolt connection washer) is an active anti-loosening component specifically designed for medium-and high-load bolt connections. Leveraging the axial deformation characteristics of its disc-shaped structure, this washer stores elastic potential energy during bolt pre-tightening and continuously provides the connection pair with a stable pre-tightening force, effectively compensating for any loss of clamping force resulting from factors such as vibration, wear, creep, and thermal expansion/contraction. Jiangsu Sunzo Spring Elastic Technology Co., Ltd. (brand: SUNZO) has long been engaged in the research, development, and manufacturing of disc spring products and can supply high-quality DIN 6796-compliant disc spring washers as well as customized solutions in accordance with the DIN 6796 standard. This article introduces the structural principles, performance characteristics, materials, and selection considerations for DIN 6796 disc spring washers, serving as a reference for relevant engineering and procurement professionals.
DIN 6796 is a standard for disc springs issued by the German Standards Association; its product is a disc-shaped elastic washer with a conical angle. Unlike conventional flat washers or standard elastic washers, the DIN 6796 washer undergoes axial elastic deformation during bolt tightening, converting a portion of the tightening torque into elastic potential energy, which is continuously released during service, thereby applying a stable axial preload to the bolted connection.
This design enables active anti-loosening capability: when vibration, wear, or material creep reduces the clamping force, the washer utilizes elastic rebound to restore the preload, helping the connection pair maintain sufficient clamping force. In most applications, it serves as an upgraded alternative to the traditional "flat washer + standard elastic washer" combination, simplifying the assembly process and enhancing connection reliability.
Based on the product characteristics of DIN 6796 disc spring washers, their core advantages are primarily reflected in the following aspects:
· Loosenage resistance: Tested in accordance with the DIN 25201-4 transverse vibration standard, the M10 specification maintains a 75.67% clamping force retention rate – approximately 1.59 times that of the traditional "flat washer + elastic washer" combination – thereby significantly reducing the risk of loosening under vibration conditions;
· Elastic pre-tensioning maintenance: The conical design continuously applies an axial pre-tensioning force, which compensates for any reduction in clamping force caused by material creep, temperature fluctuations, or seal compression, thereby maintaining the stable state of the connection pair;
· Heavy-load compatibility design: The force applied when the washer is flattened into a tight-fit position corresponds to 70%–90% of the tightening force required for 8.8 or 10.9-grade bolts, ensuring excellent compatibility with bolts used in medium-and high-load applications;
· Elastic stability and reliability: High-elasticity spring steels such as 65Mn, 60Si2MnA, and 50CrVA are preferentially used for manufacturing; their hardness is typically maintained within the range of 420–510 HV, which helps ensure anti-loosening and fracture resistance during long-term service;
· Diverse surface treatment options: Including blackening, electroplating, phosphating, zinc plating (Dakro/Jiemete), mechanical galvanizing, and other treatment methods to meet various corrosion resistance requirements.
Material selection directly influences the elasticity, fatigue life, and corrosion resistance of disc spring washers. Jiangsu Sunzo offers a range of material options tailored to specific operating conditions, including 1074 carbon steel, 51CrV4, 60Si2Mn, 65Mn, SUS302, SUS304, SUS316,17-7PH, Inconel 718, and Inconel X-750 – covering applications spanning conventional industrial uses to specialized environments such as high-temperature and highly corrosive conditions.
For surface treatment, in addition to conventional processes such as phosphating, Dakro coating, blue treatment, and polishing, alternative solutions—including Jiemete treatment, passivation, and Teflon coating—can also be provided. Phosphating improves lubrication and corrosion resistance; Dakro coating significantly enhances salt spray resistance; and Teflon coating reduces the friction coefficient. Users may select the appropriate combination based on their specific media, environmental conditions, and assembly requirements.
DIN 6796 disc spring washers are available in standard size series, suitable for common connection applications involving bolts with M3 or larger specifications. For non-standard sizes or special requirements, Jiangsu Sunzo offers custom manufacturing services; key parameters such as outer diameter, inner diameter, thickness, and conical angle can be tailored according to the customer's drawings or application requirements, complemented by load–deformation characteristic verification to ensure the product is fully compatible with the intended assembly conditions.
DIN 6796 disc spring washers are widely used in industries and applications where stringent bolt-loosening prevention requirements exist: in construction machinery (e.g., excavators, cranes, bulldozers, etc.) to ensure secure fastening under severe vibration; in automotive manufacturing for critical fastening points on the chassis and powertrain; in wind power equipment for the connection between the tower and nacelle subjected to long-term alternating loads; and in bolted connections for heavy-duty structures such as those used in metallurgy, bridges, and shipbuilding. Additionally, in hydraulic sealing assemblies, valves, and pump equipment, disc spring washers can be employed to compensate for the compressive deformation of sealing elements and maintain stable sealing preload.
Jiangsu Sunzo Spring Elastic Technology Co., Ltd. is an elastic component manufacturing enterprise in which the China National Nuclear Corporation's Industrial Fund holds a stake. Since its establishment in 2006, the company has specialized in the research, development, production, and sales of elastic components such as disc springs and wave springs. Its R&D center is located in Nanjing, and its production base is situated in Sihong, Jiangsu Province. The company has obtained certifications under various management systems, including ISO 9001 and IATF 16949, and has participated in the development of relevant national industry standards as well as international ISO standards. With more than 30 invention patents held, the company possesses comprehensive production capabilities covering the entire manufacturing process—including annealing, forming, heat treatment, high-pressure forming, and automated sorting—and can provide customers with integrated services spanning product selection, design, and mass production delivery.
Leveraging its large-scale production facilities and robust quality management system, Jiangsu Sunzo supplies disc spring washers compliant with the DIN 6796 standard to domestic and international customers across various industries—including construction machinery, automotive, wind power, nuclear power, and hydrogen energy—while offering bespoke customization and rapid prototyping services to help customers enhance the safety and reliability of their bolted connections.
The reliability of bolted connections directly impacts equipment operational safety and maintenance costs. The DIN 6796 disc spring washer, featuring active anti-loosening and stable pre-tensioning properties, provides a reliable solution for heavy-load connections. Jiangsu Sunzo will continue to leverage its expertise in materials, manufacturing processes, and design to deliver high-quality DIN 6796 disc spring washer products and technical services to its customers.
