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1-8"x5" A325 Hvy Hex Structural Bolt HDG hot dip galvanized hexagonal head bolt details. HDG hex bolt How to calculate bolt tightening torque. By applying tightening torque, we are basically stretching the bolt. which in turns creates a U-bolt UB-2"-M12 PT HDG - Øglænd system Fastener galvanizing (Bolt/Nut/) ...