Prime-Line 9074800 Nylon Insert Lock Nuts, #4-40, Grade 2 Zinc Plated Steel (50 Pack)
Special Features
- Size: #4-40
- Features an internal nylon ring that grips bolt threads better than a standard finished nut
- Great for use in applications where the bolt may be subject to vibration
- Can also be used as a secondary nut to help lock the main nut in place
- The side with the nylon insert should face towards the tip of the bolt, not towards the surface being fastened
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