Forgefix shear nut zinc plated forgefix 10shnt8 these forgefix shear nuts are zinc plated they provide a high security permanent fastening as the hexagonal part of the nut shears off at a pre determined torque leaving a totally tamper proof cone ideal for security applications such as window grilles roller shutters external seating and playground equipment can be used together with many fixing types particularly sleeve anchors and through bolts zinc coatings prevent corrosion of the