Breakaway security nuts feature a tapered diameter, making the nuts resistant to gripping devices. Breakaway Shear Nuts are installed using a standard wrench, which grips the external hex nut to turn the nut along a thread until the proper torque is reached and the hex portion snaps off. What is left is a coned nut without any grooves making the nut extremely difficult to remove or tamper with.
Security Nuts are made of Zamak 5 Zinc Alloy (95% Zinc, 4% Aluminum, 1% Copper). Zamak is an alloy of Zinc and Aluminium, sometimes also incorporating Magnesium and Copper. The added copper in Zamak 5 increases the strength, hardness, and corrosion resistance of the alloy, but reduces its ductility and dimensional accuracy compared to other Zamak Alloys.