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.
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