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ชนิดเกรดเหล็กคาร์บอน สำหรับ Bolt
Grade - 2
 Low Carbon Steel. Economical for use in  non-  critical applications where the fastener is not  subject to extreme temperatures or stress.
Grade - 5
 Medium Carbon Steel, Quenched and Tempered.  Has greater tensile strength than a Grade-2.
 Yield-to-tensile ration is the lowest of all heat- treated steels.
Grade - 8
 Medium Carbon Alloy Steel, Quenched and  Tempered. Has greater tensile strength than a  Grade-5. Designed for use in high stress  applications.



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