Home » Product » Hex Lock Nut Nylon Insert Grade C Zinc Yellow

Hex Lock Nut Nylon Insert Grade C Zinc Yellow

From: $0.13

BoltCraft’s Hex Lock Nut with Nylon Insert, known for its robust Light Hex, Full Height design, combines the resilience of steel with the locking efficacy of a nylon-filled collar. This nut is specially engineered for applications that demand a secure fastening solution, capable of resisting vibration-induced loosening. The zinc-plated finish adds an extra layer of corrosion resistance, making it suitable for a wide range of environments.


$100 minimum order


  • BoltCraft’s Hex Lock Nuts are precision-crafted with a focus on durability and reliability. The nylon insert at the back end of the nut creates a tight, frictional fit with the threads of the mating screw or bolt, effectively preventing the fastener from loosening under vibration. Available in a range of sizes, these nuts are designed to be used with like-material machine screws and bolts, offering a versatile and reusable locking solution.

Applications & Advantages

  • Secure Locking Mechanism: The nylon insert provides a self-locking feature, ensuring the nut stays in place even in applications prone to vibration.
  • High Reusability: These nuts can be reused multiple times, offering greater flexibility and cost-effectiveness compared to non-reversible alternatives.
  • Temperature Resilience: While ideal for a wide range of applications, it’s noted that nylon begins to deteriorate at temperatures around 150°F and is not recommended for use above 250°F, ensuring suitability for environments within this temperature range.

Material & Specifications

  • Material Quality: For sizes up to 5/8″, these nuts are made from AISI 1008 – 1010 or equivalent steel, ensuring a good balance of ductility and strength. For larger sizes, from 3/4″ to 1-1/2″, AISI C1117 or equivalent steel is used, offering enhanced robustness for heavy-duty applications.
  • Nylon Insert: The nylon collar inside the nut locks onto the threads of the bolt, providing a secure fit that resists loosening from vibrations. The insert is available in various colors for easy identification.
  • Finish: These steel nylon insert stop nuts typically come with a zinc plating, offering added corrosion resistance and durability.

Hardness & Durability

  • Hardness Specifications: For sizes 1/4″ through 5/8″, the nuts are designed to achieve a hardness level of Rockwell B95 – C32. For sizes 3/4″ through 1-1/2″, a slightly lower hardness range of Rockwell B80 – C32 is maintained to ensure both strength and ductility.
  • Durable Design: The combination of a steel base and a nylon insert not only enhances the locking capability but also contributes to the overall durability of the nut, making it a reliable choice for various applications.

Proof Load & Finish

  • Load Capacity: These nuts are engineered to withstand significant stress and load, maintaining integrity and holding capacity under demanding conditions, thanks to their robust material specifications and design.
  • Protective Coating: The zinc plating not only serves as a protective barrier against environmental factors but also ensures the longevity and sustained performance of the nut in diverse settings.
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