Hot galvanized. Meets minimum physical requirements of ASTM A307. Anchor bolts are manufactured from raw materials. . Hot galvanized anchor bolts are recommended when working with treated lumber—10 bolts per box with nuts. Anchor bolts are for attaching the bottom plate or sill plate to newly poured concrete foundations. This product meets ASTM A307 specifications. The hot-dipped Galvanized is recommended when working with treated lumber.