Thread connector lock

An apparatus, comprising:

• a key disposed at least partially in a first recess formed in a first tubular, wherein the key defines teeth that face in a first axial direction, wherein the key moves linearly in the first axial direction and is prevented from circumferential movement relative to the first tubular;
• a first biasing member engaging the key and biasing the key in the first axial direction relative to the first tubular;
• a rack configured to be disposed at least partially in a second recess formed in a second tubular, wherein the rack defines teeth that face in a second axial direction that is opposite to the first axial direction, the teeth of the rack being configured to mesh with the teeth of the key, and wherein the rack moves linearly in the circumferential direction and is prevented from axial movement;
• and
• a second biasing member engaging the rack and biasing the rack in a first circumferential direction, wherein the rack is configured to reciprocate circumferentially relative to the second tubular by engagement with the key and the second biasing member and in response to the first tubular being rotated into connection with the second tubular.