Abstract: A breakable bolt assembly comprising a pin member, a collet member and a thumb knob member. The assembly is designed to mount without the use of hand or power tools, and features a pin member which breaks apart when the shear force on it exceeds a predetermined magnitude. The pin member comprises an elongated pin body and a pin head. A proximal length portion of the pin body has a plurality of flutes transverse to the length of the pin body and spaced from each other by ribs. The diameter of the pin body at the flute most proximate the pin head is smaller than at the more distal flutes. Thus, shear force is transferred to the most proximal flute, and when the force exceeds a predetermined magnitude, the pin member breaks apart at the juncture of the pin body and pin head. The collet member has an internal passage for receiving the distal end of the pin member, and is compressible around the pin member.