Class 8.8 vs 10.9 bolts

high tensile bolt
ParameterClass 8.8 BoltClass 10.9 Bolt
Tensile StrengthThe tensile strength is 800 N/mm²The tensile strength is 1040 N/mm²
Yield StrengthHas a yield strength of 640 N/mm²Has a yield strength of 940 N/mm²
MaterialUsually, they are manufactured with medium-carbon steelTypically made using alloy steel
ResistanceHas a good resistance to wear and tearShows superior resistance to wear and tear
HardeningHardened by a ‘quench and temper’ processAlso hardened by a ‘quench and temper’ process, but at higher temperature
Load Carrying CapacityHas a lower load carrying capacityHas a higher load carrying capacity
Application AreasUsed in general hardware where high strength is not a major requirementUsed in high strength applications such as automotive or structural use
CostGenerally more economical due to less alloy contentHigher cost due to more alloying elements
ElongationMinimum elongation of 12%Minimum elongation of 9%
HardnessLess hardness (Typically 250HV)Higher hardness (Typically up to 385HV)