High strength bolt type fastener. Eliminates problems associated with loose nuts, lock nuts, bolt, and solid rivets. Vibration & is tamper-resistant. Consistent pre-tension values. High-speed installation, low noise level. High tensile, grade 8.8 variety of head forms and lengths. Large Diameter hydraloc is a heavy duty, two-piece fastener designed to provide vibration free high strength joints. Easy and simple to place and yet long lasting. It is an ideal solution where welding is not possible or solid riveting or threaded fastener provides strength of over 300 KN