DESCRIPTIONThe SAE bolt strength grades range from grade 2 to grade 8. The higher the grade number, the greater the bolt strength. Identification is determined by the line marks on the top of each bolt
head. The actual bolt strength grade corresponds to the number of line marks plus 2. The most commonly used metric bolt strength classes are 8.9 and 10.9. The metric strength class identification number
is imprinted on the head of the bolt. The higher the class number, the greater the bolt strength. Some metric nuts are imprinted with a single-digit strength class on the nut face. Refer to the Fastener
Identification and Fastener Strength Charts.
Bolt Markings and Torques - MetricBolt Markings8.8/8.910.912.9Bolt Dia.N·mFt. Lbs.N·mFt. Lbs.N·mFt. Lbs.612105*14125*1612825250*3223382810544060457455129570108801351001415511517513021616016243180324240324240* Inch Lbs.