A retention assembly for interconnecting rotating components (24, 36) in a gas turbine engine, comprising: a first rotating component defining a central rotation axis; a second rotating component rotatable about the central rotation axis, the second rotating component including an engagement portion defining protrusions circumferentially spaced apart and extending axially from the second rotating component; a threaded fastener axially retaining the second rotating component to the first rotating component, the threaded fastener having key-receiving slots circumferentially spaced apart and extending radially into an outer circumferential surface of the threaded fastener, and a groove extending circumferentially about the threaded fastener within the outer circumferential surface; a key washer mounted to the threaded fastener, the key washer being annular and defining a first axial surface and a second axial surface axially spaced apart from each other, the key washer having a first set of keys circumferentially spaced apart and extending radially inwardly from a radially inner surface of the key washer adjacent the first axial surface of the key washer, the key washer having a second set of keys circumferentially spaced apart and extending axially from the second axial surface of the key washer, the first set of keys received within the key-receiving slots in the threaded fastener; and a retaining ring disposed within the groove in the threaded fastener, the retaining ring radially retained by the protrusions extending axially from the second rotating component, the retaining ring axially retained between the second set of keys and the second axial surface of the key washer, the retaining ring radially spaced apart from the second set of keys of the key washer to define a radial gap between the second set of keys and the retaining ring. a first rotating component defining a central rotation axis; a second rotating component rotatable about the central rotation axis, the second rotating component including an engagement portion defining protrusions circumferentially spaced apart and extending axially from the second rotating component; a threaded fastener axially retaining the second rotating component to the first rotating component, the threaded fastener having key-receiving slots circumferentially spaced apart and extending radially into an outer circumferential surface of the threaded fastener, and a groove extending circumferentially about the threaded fastener within the outer circumferential surface; a key washer mounted to the threaded fastener, the key washer being annular and defining a first axial surface and a second axial surface axially spaced apart from each other, the key washer having a first set of keys circumferentially spaced apart and extending radially inwardly from a radially inner surface of the key washer adjacent the first axial surface of the key washer, the key washer having a second set of keys circumferentially spaced apart and extending axially from the second axial surface of the key washer, the first set of keys received within the key-receiving slots in the threaded fastener; and a retaining ring disposed within the groove in the threaded fastener, the retaining ring radially retained by the protrusions extending axially from the second rotating component, the retaining ring axially retained between the second set of keys and the second axial surface of the key washer, the retaining ring radially spaced apart from the second set of keys of the key washer to define a radial gap between the second set of keys and the retaining ring.