What is Grade A bolt?
Likewise, how strong is a Grade A bolt?
Bolt Grade Markings and Strength Chart
|Head Marking||Grade and Material||Mechanical Properties|
|Min. Tensile Strength (psi)|
|3 Radial Lines||Grade 5 Medium carbon steel, quenched and tempered||120,000|
|6 Radial Lines||Grade 8 Medium carbon alloy steel, quenched and tempered||150,000|
Similarly, what is ASTM a307 Grade A? ASTM A307 Grade A Covers the mechanical and material requirements for inch series fasteners in diameters from 1/4″ through 4″, made of carbon steel having a minimum tensile strength of 60,000 psi.
Then, is Grade 8 or 10.9 stronger?
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. A low carbon steel for general use.
What is the hardest bolt grade?
Grade 8 / Grade G Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.