Our windmill bolts are primarily used in the prestressed anchor cage system for the wind turbine mill foundation. Common grades include 8.8, 10.9, and 12.9. With the increasing prevalence of higher towers in the industry, the use of 10.9-grade bolts has become more widespread. Each bar undergoes meticulous inspection and testing, encompassing chemical, mechanical, and non-destructive assessments, all conducted on a per-piece basis.