Grade 8 Bolts
(Information and Online Shopping)
|Grade||Radial Bolt Markings||Material||Nominal Size Diameter/Inches||Proof Load
6 Radial Lines
|Medium Carbon Alloy Steel||1/4" thru 1 1/2"||120,000||150,000||130,000|
Grade 8 Bolts: Strength and Durability
The factor that makes a grade 8 bolt different from a lower grade bolt is its preload strength. Higher grade materials, such as carbon alloy steel, allow for greater torque strength in the threads of the bolt. The preload, or thread tension in a fastener is higher when the type of steel being used is grade 8 in quality.