26th August 2018

glaserbolt
10

What is the hardness of a Grade 8 bolt?

Materials - Medium Carbon Steel Bolts in SAE J429 (Grades 2, 5 and 8)
GradeNominal size, inchesCore hardness, Rockwell
2¾ - 11/2 inchB70 to B100
5¼ - 1 inchC25 to C34
1 - 1-1/2 inchesC19 to C30
8¼ - 1-1/2 inchesC33 to C39

Herein, how many marks are on a Grade 8 bolt?

Bolt Grade Markings and Strength Chart
Head MarkingGrade and MaterialMechanical Properties
Min. Tensile Strength (psi)
3 Radial LinesGrade 5 Medium carbon steel, quenched and tempered120,000
105,000
6 Radial LinesGrade 8 Medium carbon alloy steel, quenched and tempered150,000

Is a 10.9 Bolt stronger than Grade 8?

Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use. A tempered medium carbon steel. Class 10.9 is stronger than class 8.8, and is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8.
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