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21 Inch fasteners Nuts General Free spinning nuts and locknuts are two different types of nuts that are used for different situations 1st Free spinning nuts Tensioninduced locknuts This type of nuts can be completely unscrewed by hand The preload is applied by further turning with a tool Examples hexagon nuts flange nuts serrated locking nut kepslock nuts 2 Locknuts Prevailing torque locknuts When tightening or loosening the nut an additional tightening or clamping torque needs to be overcome The securing effect is based on increased friction clamping in the thread The securing effect of these nuts starts immediately when screwing on Examples Securing nuts with metallic clamping part nylon stop nuts Types of nylon nuts • NU series 6KT nuts heavy version full height • NTU series 6KT nuts heavy version short height • NM NE series 6KT nuts light version standard height • NTM NTE series 6KT nuts light version short height Only for use in applications with limited scope and not for loadbearing purposes Hardness values – lock nuts Nuts strength Diameter - securing nuts Rockwell hardness N2 N5 ¼ –1 ½ max 28 HRC N8 ¼ – ⅝ ¾ – 1 1 ⅛ – 1 ½ 24-32 HRC 26-34 HRC 26-36 HRC