Tightening Bolts

Material: Grade 8.8, surface treated with zinc nickel alloy, salt spray test for 500 hours (White Rust).

The M12 × 35 fastening bolt is mainly used at the end of the spiral pile and the connection position of the spiral pile. It is equipped with two M12 washers with an outer diameter of 32mm and a thickness of 3mm to increase the size, ensuring that the fastening bolt does not get stuck in the flange plate and connection structure groove, avoiding bolt loosening, and is safer and more reliable.