Fastener with unidirectional latch

A mechanical fastener assembly including an anti-rotation feature configured to prevent rotation with respect to a material into which said fastener assembly is screwed, said mechanical fastener assembly configured to be turned by a driving tool, comprising:

• a. a threaded shaft extending along a central axis and having a first end and a second end;
• b. a latching shank connected to said first end of said threaded shaft;
• c. a head connected to said latching shank, said head including a receiver configured to receive said driving tool;
• d. an outward facing sawtooth array on said latching shank;
• e. a lock ring encircling said latching shank;
• f. said lock ring including an outward-facing rotation-preventing feature configured to prevent rotation between said lock ring and said material into which said fastener is driven;
• g. wherein said lock ring includes a spring tab configured to engage said sawtooth array and allow rotation of said sawtooth array in a first direction with respect to said spring tab but prevent rotation in a second direction;
• h. wherein said lock ring is configured to slide along said latching shank in a direction parallel to said central axis of said threaded shaft from a first position to a second position;
• i. said first position is proximate said head;
• j. said second position is distal to said head;
• k. wherein said lock ring is configured so that said spring tab does not engage said sawtooth array when said lock ring is in said second position;
• l. wherein said head includes an access slot;
• and
• m. wherein said driving tool is configured to pass through said slot and contact said lock ring in order to move said lock ring from said first position to said second position.