... -25Tensile strength(LBS): 500,Torgue Strength(FT LBS):6, Voltage withstand(KV):6,screw(mm):6, weight(G):282. SM-30Tensile strength(LBS): 550 ... ,Torgue Strength(FT LBS):8, Voltage withstand(KV):8,screw(mm ... ): 650,Torgue Strength(FT LBS):10, Voltage withstand(KV):12,screw(mm):8,weight(G):864. SM-51Tensile strength(LBS): 1000 ...