Fastener Identification

THREAD IDENTIFICATION

Thread Notation Chart - SAE/Metric:

SAE and metric bolt/nut threads are not the same. The difference is described in the Thread Notation Chart.

GRADE/CLASS IDENTIFICATION

Fastener Identification:

Fastener Strength:

The 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 9.8 and 12.9. 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.