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A193 B7 A320 L7 PTFE Stud bolt and A194 2H Heavy nut, US $ 0.01 - 3 / Piece, ASTM A193 B7, ASTM A193 A320 L7Carbon steel 45#, Shanghai, China, Tengri.Source from Shanghai Tengri Metal Products Co., Ltd. on Waimaotong.com.