M6 Zinc Flanged nut - with serration

Commonly used in many Automotive applications
Fits the following body bolts:
CB1-25 Black Uni M6/10mm Hex Bolt & Washer - Pkt 25

Serrated flange nuts are hex flange nuts with a serrated bearing surface. The nut turns freely until the serrations contact and displace material on the mating surface as the nut is tightened; less torque is needed to install than remove because the gripping action of the serrations create a ratchet-type locking feature that is resistant to vibration. The protruding circular flange increases the bearing surface of the nut allowing it to be used with irregular and oversized holes.
 
CNTM6A