We are a professional manufacturer of ASTM A193 B7M SA193 B7M Stud bolts in China
ASTM A193 Grade B7M is a standard material specification for chromium-molybdenum alloy steel fasteners for use in high tensile, high temperature and special purpose applications
Grade B7M is a heat-treated chromium-molybdenum alloy steel with minimum tensile requirement of 100 ksi, yield of 75 ksi and maximum hardness of 99 HRB. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment, recommended nuts-washrs for Grade B7M fasteners. The difference between B7 & B7M is the hardness testing requirement for each bolt from a given lot in the latter.