We strongly recommend against making any configuration substitutions without approval of the Engineer of Record. The term “headed anchor bolt” is somewhat ambiguous, but our interpretation of this product would be a bolt with a forged head, as opposed to a rod with a welded nut. If a galvanized, headed anchor bolt has been specified, there is a good reason the engineer chose that particular design. Making the decision to change configurations, or letting a bolt salesperson convince you that a rod with a nut is the same as a headed anchor bolt, could expose you and your company to a tremendous amount of liability.