Screw bolt fastener, through drillings in two components, has a countersunk head and ribs to mesh into rib structures in the drillings for a rigid lock

摘要

The metal screw bolt (3), with a nut (15), passes through drillings (1,2) in two components (120,121) to hold them together. The conical (5) bolt head (11) transits into a shaft section (10) fitted with channels and ribs (13). When the nut and bolt are tightened, the ribs mesh with matching structures within the drillings. The upper component has a countersink (6) drilling to accommodate the bolt head shape.