5/8-11 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Black Oxide 5/16-18 057-09 It has a partially threaded

It has a partially threaded shank with a 6" thread length and an undersized body for easy insertion into pre-drilled holes

preventing pull-through

and is fully threaded for maximum strength

This 1/2-13 x 3 ASTM A193 ASME B16

It is made from durable steel and has a zinc yellow finish that provides excellent corrosion resistance

5/8-11 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Black Oxide 5/16-18 057-09 It has a partially threadedThese 5 8 11 Serrated Flange Hex Lock Nuts are made of HR15N case hardened steel and have a black oxide finish. They are designed to provide a secure and vibration resistant connection in a variety of applications. The serrated flange helps to prevent the nut from loosening, even under extreme vibration or shock loads. These nuts are also heat treated to provide increased strength and durability. They meet the requirements of ASTM A563 Grade C and are