In high-stress mechanical engineering, maintaining the exact preload of a bolted joint is critical to system safety and longevity. When assemblies encounter heavy vibrations, thermal expansion, or material settling, standard fasteners often experience clamp-load loss. This is where DIN 6796 conical spring washers—frequently referred to as heavy-duty Belleville washers—become essential components.

What is a DIN 6796 Disc Spring?

Manufactured to strict German standards, DIN 6796 specifies heavy-duty conical spring washers designed specifically for bolted connections. Unlike a standard flat washer, a DIN 6796 washer has a distinct, shallow conical profile. As a bolt or nut is tightened, the washer is flattened, generating a continuous axial spring force against the fastening assembly. This controlled spring action absorbs minute movements and physical relaxation within the joint, maintaining a highly secure, frictional locking effect.

Mechanical Capabilities and Specifications

These heavy-duty washers are built to withstand immense forces in tight, compact spaces. When fully compressed, the force generated by a DIN 6796 washer equals roughly 70% to 90% of the contact pressure required for high-tensile property class 8.8 and 10.9 bolts.

Primary Industrial Applications

Because they prevent catastrophic loosening from thermal cycling and high fatigue, DIN 6796 heavy-duty disc springs are widely used across the energy, aerospace, automotive, and heavy manufacturing sectors. You will regularly find them deployed in:

• Heavy bolted sections including industrial pipe flanges, electrical transformers, and high-voltage bus-bars.
• High-torque industrial machinery, fabrication equipment, and structural steel connections.
• Pressure control systems, industrial regulators, and heavy-duty braking assemblies.

For a quote for these parts in bespoke materials such as Inconel, please contact us today.

To browse our standard DIN 6796 range online, please click here.