Fastening system with jig restriction flange

A fastening system comprising:

• a first fastened body;
• a second fastened body;
• and
• a fastener including:
• a post including a first end and a second end in an axial direction;
• a first screw extending from the first end and fastened to the first fastened body, the first screw having a thread formed only on a portion of the first screw that is exposed outside the post;
• and
• a second screw extending from the second end and fastened to the second fastened body, the second screw having a thread formed only on a portion of the second screw that is exposed outside the post, wherein
• the post is configured so that a jig is fitted to the post from the second end in the axial direction, and the jig fitted to the post is rotated so that the first screw is engaged with the first fastened body,
• the first screw and the second screw are coaxial with each other and have different axial lengths,
• the post includes a flange that restricts the fitting of the jig to the post from the first end to a position that allows the jig to rotate the post,
• the post is an insulative resin to electrically insulate the first screw from the second screw, and
• one of the first fastened body and the second fastened body is a nut used to fix an electric conductor, which is electrically connected to a battery cell, to the fastener.

A fastening system comprising:

• a first fastened body;
• a second fastened body;
• and
• a fastener including:
• a post including a first end and a second end in an axial direction;
• a first screw extending from the first end and fastened to the first fastened body, the first screw having a thread formed only on a portion of the first screw that is exposed outside the post;
• and
• a second screw extending from the second end and fastened to the second fastened body, the second screw having a thread formed only on a portion of the second screw that is exposed outside the post, wherein
• the post is configured so that a jig is fitted to the post from the second end in the axial direction, and the jig fitted to the post is rotated so that the first screw is engaged with the first fastened body,
• the first screw and the second screw are coaxial with each other and have different axial lengths,
• the post includes a flange that restricts the fitting of the jig to the post from the first end to a position that allows the jig to rotate the post,
• the post, the first screw, and the second screw are formed from a metal,
• the first fastened body is a battery cell, and the second fastened body is a nut used to fix an electric conductor to the fastener to electrically connect the electric conductor to the battery cell.