Prime-Line 9074800 Nylon Insert Lock Nuts, #4-40, Grade 2 Zinc Plated Steel, (50-pack)
- Nut Type: Hex Locknut with Blue Nylon Insert.
- Will NOT COME LOOSE: With a nylon insert inside, the lock nuts greatly reduce loosening under vibrations and torque..
- Made of 304 stainless steel (no coating outside), provides good strength and corrosion resistance in bad environments..