CONICAL SPRING WASHER FOR BOLTED CONNECTIONS — PRODUCT INTRODUCTION

The conical spring washer specified by DIN 6796:2009 is a compact, elastic anti-loosening fastener specifically designed for high-strength bolted connections. With a shallow conical shape, it generates sustained axial elastic counterforce when compressed during tightening, effectively compensating for relaxation caused by vibration, temperature changes, or gasket creep in the joint. Typically placed under the bolt head or nut, this washer relies on its own conical stiffness and friction to prevent loosening. Compared with ordinary spring washers, it offers more uniform load distribution and more reliable anti-loosening performance, making it widely used in mechanical, automotive, and industrial equipment applications where joint integrity is critical.

I. PRODUCT FEATURES

Conical Elastic Structure: Features a continuous truncated cone shape. When compressed flat, it produces elastic recovery force similar to a disc spring. Compared with helical spring washers, it offers superior load-deflection characteristics and more uniform bearing.

High-Strength Material and Heat Treatment: Typically manufactured from spring steel grades such as C60S, C75S, or 51CrV4. After quenching and tempering, hardness reaches HV 425–540, achieving a balance of high elasticity and resistance to permanent deformation.

Serrated Anti-Loosening Surface: Some models feature fine serrations on the inner and outer edges. During tightening, these slightly embed into the joint surface and the underside of the bolt head or nut, providing additional friction and further enhancing the anti-loosening effect.

Standardized Dimensions and Marking: Specifications cover M3 to M36. The washer is typically stamped with the manufacturer’s mark and size designation for easy traceability and directional identification during installation.

II. PRODUCT ADVANTAGES

Active Relaxation Compensation: With its elastic compression-flattening characteristic, it automatically compensates for preload loss when minor settlement or gasket creep occurs in the bolted joint, maintaining a long-term locked state.

Excellent Vibration and Anti-Loosening Performance: The combination of sustained elastic force and surface friction effectively resists bolt rotation and loosening caused by impact, vibration, and alternating loads.

Easy Installation — No Directional Requirement: Can be used with the conical face up or down (typically with the large diameter of the cone facing the nut for easier embedding). No pairing required, improving assembly efficiency and reducing errors.

Protects Mated Surfaces: The uniformly distributed annular bearing surface reduces surface pressure on the joined components, minimizing indentation and wear — beneficial for protecting soft materials such as aluminum and plastics.

III. APPLICATION SCOPE

Automotive and Powertrain: Connections in engine brackets, exhaust manifolds, chassis suspension, and braking systems that are subject to intense heat and vibration.

Mechanical Equipment and Engineering Structures: Node locking for vibrating conveyors, crushers, mining machinery, and heavy steel structures.

Railway and Transportation Facilities: Anti-loosening fastening for vehicle bogie components, rail fastener compensation pads, and container locking devices.

Electric Motors and Pump/Valve Flanges: Connections on motor bases, pump bodies, and compressor cylinder heads that are prone to loosening due to operational vibration.

Household Appliances and Precision Instruments: Applications with long-term vibration damping and anti-loosening requirements, such as washing machine and refrigerator compressor bases.