The difference between grade 8.8 and 12.9 bolts

Our factory mainly produces high-strength bolts of grade 8.8 and 12.9, with the standard being DIN933, DIN931, and DIN912, with specifications ranging from M10 to M48

So, what is the difference between grade 8.8 carbon steel bolts and grade 12.9 bolts? Please refer to the analysis below

1. Strength grade and hardness. Both grade 8.8 and 12.9 bolts belong to high-strength bolts, but the hardness of grade 12.9 bolts can generally reach 39 to 44HRC, while the hardness of grade 8.8 bolts is generally between 22 and 33HRC. This hardness difference is mainly due to the different materials used. Grade 12.9 bolts are usually made of alloy steel materials (such as SCM435), while grade 8.8 bolts are generally made of medium carbon steel materials.

2. Usage scenarios. Grade 12.9 bolts, due to their high hardness and strength, are commonly used in large mechanical equipment that needs to withstand large loads, such as in the textile, injection molding, hydraulic, and mechanical industries. Grade 8.8 socket screws, due to their low hardness and strength, are commonly used in small mechanical equipment such as electronic products, digital products, and power equipment.

3. Price. The price of grade 12.9 bolts is usually higher than grade 8.8 bolts because they have higher tensile strength and load capacity.Our factory prices are all wholesale prices, which is very advantageous. Hope to receive more customer support, please review our website www.cnzyl.com to know more about our products and our company.