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Non Serrated Flange Lock Nut Grade G Black Phosphate

From: $0.40

BoltCraft’s Non-Serrated Flange Lock Nut Grade G Black Phosphate combines robust construction with a unique flange design, offering superior locking capabilities and an increased bearing surface for enhanced load distribution, finished with a durable black phosphate coating for added corrosion resistance.


$50 minimum order


  • BoltCraft’s Grade G Flange Nuts feature an innovative design with a non-serrated flange that expands the bearing surface, providing a more stable and secure fastening solution. The black phosphate finish not only adds to the corrosion resistance but also enhances the aesthetic appeal, making it suitable for a variety of applications where appearance and performance are critical.

Applications & Advantages

  • Ideal for applications that require a high torque resistance, ensuring that the nut remains secure even under heavy vibrations.
  • The flange design allows for distribution of the clamping load more evenly, reducing the risk of damage to the mating surface and improving the joint’s overall reliability.
  • Particularly effective in spanning oversized or misaligned holes, making installation more forgiving and versatile.
  • The non-serrated flange ensures a smooth bearing surface, ideal for applications where the mating surface must remain unmarred.

Material & Specifications

  • Manufactured from high-quality carbon steel, these nuts meet stringent chemical composition requirements, ensuring consistent performance and durability.
  • The black phosphate coating provides an additional layer of protection against environmental elements, further extending the lifespan of the nut.
  • Designed to be compatible with Grade G screws and bolts, offering a cohesive and reliable fastening system.

Hardness & Durability

  • Engineered to achieve optimal hardness levels, with Rockwell hardness specifications tailored to different diameters, ensuring the nut can withstand the necessary torque without compromising integrity.
  • The non-serrated flange design, combined with the robust material choice, contributes to the overall durability and longevity of the nut, making it suitable for demanding applications.

Proof Load & Finish

  • These flange nuts are designed to meet specific proof load requirements, providing assurance of their capability to handle specified loads without failure.
  • The black phosphate finish not only enhances the corrosion resistance but also provides a sleek, professional appearance, making these nuts a preferred choice for both functional and aesthetic applications.
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