Diameter Thread Threads Length Grade Finish Weight
0.4375 (7/16) N/A 14 Zinc Clear .048
Diameter 0.4375 (7/16)
Thread 14
Finish Zinc Clear
Weight .048

Heavy Hex Nylon Insert Lock Nuts otherwise known as NU Series Nylon Insert Nuts, Heavy Nylok Nuts, Heavy Stop Nuts, Plastic Insert Heavy Lock Nuts, Non-Metallic Insert Heavy Nuts, or Polyamide Insert Heavy Lock Nuts are a part Earnest Machine’s line of NU Nylon Insert Lock Nuts.

Heavy Hex Nylon Insert Lock Nuts have a greater width across the flat compared to Nylon Hex Lock Nuts. Their extra width provides a dispersed clamping load protecting the clamping material. The nuts are designed with a nylon ring to flow into the threads creating a locking action around the thread. They’re perfect for high-vibration applications. Earnest offers the nuts in 18/8 Stainless Steel and Carbon Steel (Grade A or 2).

  • Larger length across the flats gives the nut a larger bearing area
  • The nylon ring’s tensile strength, elastic recovery, chemical resistance, temperature resistance, and impact resistance enables Nylon Insert Lock Nuts to resist vibrations and impact forces while maintaining the applied preload on the fastener
  • Used in high-vibration applications
  • Sizes range from 1/4” to 3
  • Meets ASME B18.16.6 (IFI 100/107) standards

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