Slide fastener

A slide fastener comprising:

• a first fastener stringer that comprises a first element row and a first fastener tape, the first element row including a plurality of first elements and one or more second elements, and the first element row being disposed at an opposed side edge of the first fastener tape;
• a second fastener stringer that comprises a second element row and a second fastener tape, the second element row including a plurality of first elements and one or more second elements, and the second element row being disposed at an opposed side edge of the second fastener tape;
• and
• a slider that is slidable along the first and second element rows of the first and second fastener stringers,
• wherein each of the first elements and the second elements includes a head coupled to a base via a neck, the base including an opposite surface that is located at an opposite side of the head,
• wherein the opposite surface of the one or more second elements is positioned farther from the opposed side edge than the opposite surfaces of the first elements in the first fastener stringer or the second fastener stringer, and at least two engaged second elements of the first and second element rows constitute a lock unit for locking the slider,
• wherein a total width of the engaged second elements included in the lock unit is greater than a total width of engaged first elements or a total width of engaged first and second elements;
• wherein a minimum space between a pair of flanges of the slider is greater than the total width of the engaged first elements or the total width of the engaged first and second elements;
• and
• wherein the total width of the engaged second elements included in the lock unit is greater than the minimum space between the pair of flanges of the slider.

A slide fastener comprising:

• a first fastener stringer that comprises a first element row and a first fastener tape, the first element row including a plurality of first elements and one or more second elements, and the first element row being disposed at an opposed side edge of the first fastener tape;
• a second fastener stringer that comprises a second element row and a second fastener tape, the second element row including one or more second elements, and the second element row being disposed at an opposed side edge of the second fastener tape;
• and
• a slider that is slidable along the first and second element rows of the first and second fastener stringers,
• wherein each of the first elements and the second elements includes a head coupled to a base via a neck, the base including an opposite surface that is located at an opposite side of the head, and
• the opposite surface of the one or more second elements is positioned farther from the opposed side edge of the first fastener tape than the opposite surfaces of the first elements in the first fastener stringer, and at least two engaged second elements of the first and second element rows constitute a lock unit that is for locking the slider
• wherein the opposite surfaces of the engaged second elements touch inner surfaces of a pair of flanges of the slider while the engaged second elements are pressed into a space between the pair of flanges of the slider, and the opposite surfaces of the engaged second elements touching the inner surfaces face opposite directions in partially overlapped manner.