This 5/16"-18 Black Phosphate Lock Nut has a nylon insert and is great for securely fastening a bolt when connecting materials. The nylon ring inside the nut creates resistance when displaced by a threaded fastener, which prevents loosening. The nylon insert also adds extra corrosion resistance and helps resist vibration.

Features

• Use for fastening to a bolt when mechanically joining materials
• Nylon insert for added security to keep nut in place
• Use with bolt and washer of the same material, finish, and grade
• Coarse thread for durability
• Use for indoor/outdoor projects

Priced and sold individually.