... . SM-30Tensile strength(LBS): 550,Torgue Strength(FT LBS):8, Voltage withstand(KV):8,screw(mm):8, weight(G):443. SM-40Tensile ... strength(LBS): 650,Torgue Strength(FT LBS):10, Voltage withstand(KV):12,screw(mm):8,weight(G):864. SM-51Tensile ... strength(LBS): 1000, Tongue Strength(FT LBS):20, Voltage withstand(KV):15Screw (mm):8, weight(G):835. SM-76Tensile strength ...