全金属六角锁紧螺母          
          Prevailing Torque Hexagon Nuts, High Nuts (all metal) 
                      
          全金属六角锁紧厚螺母 (性能等级:5、8、10、12级)          
          Prevailing Torque Type All-Metal Hexagon High Nuts - Property Classes 5,8,10 and 12 
                      
          全金属六角锁紧螺母          
          Prevailing Torque Type All-metal Hexagon Nuts, Style 2 - Property Classes 5, 8, 10 and 12