High-strength bolts are classified into grades 8.8, 9.8, 10.9, and 12.9, with grade 12.9 being the highest grade and possessing the greatest strength.
8.8 Grade High-Strength Bolts
8.8 grade high-strength bolts are among the lower-strength high-strength fastener materials. Due to their lower strength, they are suitable for connections with relatively light loads.
9.8 Grade High-Strength Bolts
9.8 grade high-strength bolts have slightly higher strength than 8.8 grade bolts, but are still lower than 10.9 and 12.9 grade bolts. They are suitable for applications with heavy loads and high strength requirements.
10.9 Grade High-Strength Bolts
10.9 grade high-strength bolts are the most widely used type of high-strength fastener. Their high strength makes them suitable for various heavy-load applications, such as automotive, heavy machinery, bridge, and construction engineering.
12.9 Grade High-Strength Bolts
12.9 grade high-strength bolts are the highest grade of high-strength fasteners, possessing the greatest strength. They are suitable for applications with particularly heavy loads or extremely high requirements, such as aircraft, aerospace, and nuclear industries.
