A hinge assembly for a toilet seat, the hinge assembly comprising a hinge post for pivotally supporting the toilet seat on a toilet bowl, a bolt connectable to the hinge post for securing the hinge post to the toilet bowl, the bolt being configured to extend through an opening in the toilet bowl, and a nut threadable onto the bolt to secure the hinge post to the toilet bowl, the nut having a first segment threadable onto the bolt, a second segment and a shear segment connecting the first and second segments, the shear segment having a lower torque resistance than the first and second segments such that the shear segment breaks when torque applied to the second segment reaches a predetermined amount.