DIN6797A stainless steel 304/316 outer tooth lock washers are specialized locking washers designed to prevent fasteners from loosening due to vibration or torque. They feature external teeth that bite into both the fastener head/nut and the mating surface, creating a positive mechanical lock. Available in stainless steel grades 304 (A2) and 316 (A4), they offer varying levels of corrosion resistance, with 316 providing superior protection in harsh environments.

Definition

A DIN6797A outer tooth lock washer is a type of disc-shaped washer with serrations or “teeth” around its outer circumference. These teeth are designed to embed into both the underside of the fastener head (or nut) and the surface of the component being fastened, establishing a spring-like load and a positive mechanical interference. This biting action resists rotation and prevents loosening caused by vibration, thermal expansion, or settling. They are commonly made from 304 (A2) stainless steel for general corrosion resistance or 316 (A4) stainless steel for enhanced protection against chlorides and other aggressive chemicals.

Advantages

• Anti-Vibration Locking: The primary benefit is their ability to resist loosening caused by vibration, a common issue in many mechanical assemblies.
• Positive Locking Action: The teeth create a strong mechanical bond with both the fastener and the work surface, providing a secure lock.
• Enhanced Electrical Conductivity (through teeth): In some applications, the biting action can help establish or maintain electrical conductivity between components by breaking through surface oxides.
• Corrosion Resistance (304): Stainless steel 304 (A2) offers good general corrosion resistance for atmospheric and many chemical environments.
• Superior Corrosion Resistance (316): Stainless steel 316 (A4) provides excellent resistance to chlorides, salt water, and more aggressive chemicals, making it ideal for marine and chemical processing applications.
• Prevents Loosening from Thermal Changes: Can help maintain tension even with thermal expansion and contraction.
• Standardized: Conforms to DIN6797A standards for reliable dimensions and performance.

Applications

• Automotive and Transportation: Critical in engines, chassis, and other vehicle components where vibrations are prevalent.
• Machinery and Industrial Equipment: Used extensively in manufacturing equipment, pumps, motors, and other machinery subject to movement and vibration.
• Electrical Connections: Can be used in specific electrical applications where a secure connection and potential for breaking through surface films are needed.
• Marine and Coastal Environments (316): Essential for securing components on boats, docks, and offshore structures due to the superior corrosion resistance of 316 stainless steel.
• Chemical Processing Plants (316): Ideal for equipment exposed to corrosive chemicals, acids, and alkalis.
• Construction and HVAC: Ensures secure fastening in various building structures, ventilation systems, and outdoor installations.
• Appliance Manufacturing: Used to prevent loosening in household and commercial appliances that experience vibration.