- Metric Hex nut with a serrated flange at the bottom
- Flange wacts as an integrated lock washer with serrations digging into installation material to resist vibration and loosening
- Known as a serrated flange nut, serrated hex flange nut, flange lock nut, or serrated hex flange lock nut
- CR+3 Case Hardened Zinc Plated Class 8 Steel
- DIN 6923 / ISO 4161 Sizing Standards
Serrated Flange Nuts (also known as Flanged Lock Nuts or simple Flange Nuts) feature a an integrated serrated washer at the bottom of the nut that resists vibration and is used to prevent accidental loosening of the nut after installation. Metric Flange Nuts are CR+3 case hardened zinc plated Class 8 steel, and are manufactured to DIN 6923 / ISO 4161 sizing specifications.