CARBON STEEL

Carbon steel hex fasteners are typically finished with black oxide or zinc plating for corrosion resistance. 

Common strength grades for carbon steel fasteners are:

  • Grade 8.8: The most popular grade which is now much more frequently used than the older mild steel grade 4.6.
  • Grade 10.9: Provides higher tensile strength and is frequently used in automotive and engineering applications.
  • Grade 12.9: This is a high-tensile grade, made from alloy carbon steel, and is used when maximum strength and high mechanical properties are required. 
CARBON STEEL
METRIC

METRIC
WHITWORTH

WHITWORTH
BSF

BSF
UNC

UNC
UNF

UNF