Center Lock Nut, Hillman, 5/16 -18

Hillman 58477 Center Lock Nut, Coarse Thread, 5/16-18 Thread, Plastic/Steel Coarse Center Lock Nuts are hex nuts with an indentation in the sides which slightly distorts the threading. This distortion allows for a more secure hold when threaded onto a bolt or rod compared to a nylon insert nut.

• Curved head bolts are used on cylindrical or curved surfaces
• Commonly used in lawnmower handles
• Made of high-strength steel and plastic