1. Material composition: Alloy materials commonly used for grade 12.9 bolts are more complex and high-quality than grade 10.9 to meet higher strength requirements.
2. Strength performance: The tensile strength and yield strength of grade 12.9 bolts are significantly higher than those of grade 10.9. The minimum tensile strength of grade 10.9 bolts is about 1040MPa, and the minimum yield strength is about 940MPa; The minimum tensile strength of grade 12.9 bolts is about 1220MPa, and the minimum yield strength is about 1100MPa.
3. Hardness: The hardness of grade 12.9 bolts is usually higher than that of grade 10.9.
4. Usage: Grade 10.9 bolts are commonly used as important connecting parts in general machinery, automobiles, and other fields; 12.9 grade bolts are more commonly used in situations that require extremely high connection strength, such as aerospace, high-performance racing, etc.
5. Price: Due to differences in materials and manufacturing processes, the price of grade 12.9 bolts is usually higher than that of grade 10.9 bolts.
It should be noted that when selecting bolts, factors such as strength, hardness, and price should be comprehensively considered based on specific usage scenarios and requirements to ensure the reliability and safety of the connection.
Post time: Jul-09-2024