Abstract: A nock assembly for an arrow having a rearwardly facing bore. The nock assembly includes an adapter and a nock. The adapter is mounted within the bore of the arrow, so that it is coaxial with the central longitudinal axis of the arrow. The adapter is fixed to the arrow in a predetermined angular position about the arrow axis relative to the vanes of the arrow. The adapter has a socket and a second rear opening to the socket. The nock has a head end and a bifurcated tail end. The nock is removably mounted to the adapter so that the head end of the nock is located within the socket of the adapter and the bifurcated tail end is outside of the socket. The nock assembly includes a pair of resiliently bendable locking pins that extend laterally from the head end of the nock and a forward end wall contained within the socket of the adapter, and perpendicular to the longitudinal axis of the arrow. The forward end wall has an aperture and a forward surface.

Abstract: An arrow with a nock assembly is disclosed. The rear end of the arrow shaft has a bore which has a rearwardly facing opening. One or more vanes are fixed to the outer surface of the arrow shaft. An adapter is mounted within the bore and is fixed to the shaft in a predetermined angular position about the central longitudinal axis of the arrow shaft relative to the vanes. The adapter has a socket which has a rearwardly facing opening. A nock which has a head end, and a bifurcated tail end, is removably mounted to said adapter so that the head end is located within the socket and the bifurcated tail end is outside of the socket. A mechanism is also provided for releasably locking the head end of the nock within the socket so that the nock is in a fixed angular position about the shaft axis relative to the adapter and the vanes and in a fixed position lengthwise of the shaft axis relative to the adapter socket opening.