Bolt and nut assembly with loosening prevention

An anti-loosening bolt and nut assembly comprising:

• a bolt inserted into an object to be fastened;
• a nut screw-coupled with a screw thread of the bolt;
• an anti-loosening cap for receiving the nut therein to prevent the nut from moving in a loosening direction that the nut is released from the bolt;
• and
• a nut locking member coupled with the screw thread of the bolt penetrating through the nut, and accommodated in the anti-loosening cap together with the nut in order to limit a rotational direction of the anti-loosening cap so that the nut is not rotated in the loosening direction,
• wherein the anti-loosening cap includes:
• a nut receiving cap for receiving the nut therein;
• and
• a bolt receiving cap disposed at an upper portion of the nut receiving cap and having a bolt exposure hole for exposing an end portion of the bolt penetrating through the nut to the outside, and
• wherein the nut locking member includes a coil spring coupled with the screw thread of the bolt, which penetrates through the nut, in a predetermined length to limit the rotational direction of the anti-loosening cap.