5/16-18 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Black Zinc and Bake M5 The screw has a hex

The screw has a hex head for easy driving and removal

Made from durable zinc

These 3/4-10 x 4 1/2 Hex Tap Bolts are Grade 8 fully threaded bolts with a zinc yellow finish

The elevator bolt is ideal for use in wood

5/16-18 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Black Zinc and Bake M5 The screw has a hexThese 5 16 18 Serrated Flange Hex Lock Nuts are made of case hardened HR15N steel and are finished in black zinc and bake. They have a serrated flange that helps to prevent loosening and are ideal for use in applications where vibration is a concern. These nuts meet the requirements of ASTM A563 Grade C and are RoHS compliant.