POLYGONAL PRISM LIGHTWEIGHT BOLT

摘要

PROBLEM TO BE SOLVED: To solve cost and strength suitability problems in weight reduction of a main body based on cutting work in a head part or substitution in a material of light metal, plastic and the like and problems of matching with a conventional construction method when the main body shape is changed in weight reduction of a bolt. SOLUTION: When the shape of the bolt head part and a thread part is formed into a hexagram or a regular triangle, the weight can be greatly reduced, and compliance with constructional connection with a conventional tool, a receiver and the like can be accomplished.