Class 2 Finished hex nut

When it comes to reliable and standardized fastening solutions, the Class 2 Finished hexagon nut stands out as a fundamental component in numerous industrial and construction applications. This specific type of Finished hexagon nut is engineered to meet rigorous standards, providing a consistent and secure fit on bolts and screws. As a general-purpose hexagon nut, its primary role is to clamp parts together with precision, and it is often the go-to choice for assemblies that do not require the higher tolerance of a grade 5 or 8 nut. The manufacturing process of this Finished hex nut involves cold forging from carbon steel wire, followed by a precise machining and threading operation to ensure dimensional accuracy and a smooth finish. The "finished" aspect indicates that the nut has been processed to have a clean, uniform surface, free from burrs and sharp edges, making it safer to handle and providing a more professional appearance. Its hexagon shape is designed for easy installation and removal using standard wrenches and sockets, facilitating efficient assembly and maintenance workflows. Designed to be paired with bolts of similar strength grades, this nut is a versatile and economical solution for a wide array of mechanical fastening needs.


The manufacturing excellence of the Class 2 Finished hex nut is clearly demonstrated through its detailed technical specifications. The product is defined by a comprehensive set of parameters that dictate its performance and compatibility.

  • Material: Typically manufactured from low to medium carbon steel.
  • Finish: A plain, clean finish is standard, often with a slight protective oil coating to prevent corrosion.
  • Standards: Conforms to established standards such as ASTM A563 or ISO 4032, ensuring global interchangeability.
  • Strength Grade: Rated as Class 2, which defines its proof load and mechanical properties.
  • Thread Type: Unified National Coarse (UNC) thread series is most common, but Unified National Fine (UNF) is also available.
  • Applications: Ideal for use in general machinery, automotive assemblies, furniture, and structural frameworks where high clamping force is not the primary concern.
Nominal Size (inches) Width Across Flats (inches) Width Across Corners (inches) Thickness (inches) Proof Load (psi)
1/4 7/16 0.505 7/32 ~55,000
5/16 1/2 0.577 17/64 ~50,000
3/8 9/16 0.650 21/64 ~45,000
1/2 3/4 0.866 7/16 ~40,000

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