Grades of Bolts - Bolt Grade Marking Chart | AFT Fasteners
https://www.aftfasteners.com/grades-of-bolts-bolt-grade-markings-bolt-strength-chart/
Grade 8 - SAE J429. Bolts and Screws. Medium carbon / alloy steel with additives, quenched and tempered . 1/4" - 1-1/2" 120,000 . 150,000. 130,000. C33 / C39 Grade 8.2 - SAE J429. Bolts and Screws Low carbon Boron steel, quenched and tempered. 1/4" - 1" 120,000. 150,000. 130,000. C33 / C39 : L9 - Grade 9. Bolts, Nuts and Washers. Hight strength ...
DA: 98 PA: 94 MOZ Rank: 92