| 摘要 |
PROBLEM TO BE SOLVED: To fit a bolt head and a nut onto a fitting hole easily, and to transmit turning force on a socket side to the bolt head and the nut effectively. SOLUTION: The orthohexagonal fitting hole 6 corresponding to the shape of the outer periphery of the bolt head and the nut is provided on the front end of a cylindrical body 2. Arc-shaped runs-off 7 curved in the direction of an outside diameter are provided on the respective corners of the fit hole 6. Six V-shaped grooves 8 are formed in the front end surface of the body 2, and the bottoms 8a of the respective V-shaped grooves 8 are matched with the intersecting point 9 of the respective sides of the fit hole 6 and the runs-off 7. When the bolt head and the nut are displaced from the fit hole 6 in a circumferential direction, the bolt head and the nut are guided to slop of the V-shaped groove 8, and can be engaged with the fitting hole 6 easily. Contact areas between the inner periphery of the fitting hole 6 and the outer peripheries of the bolt head and the nut are large, thus it is possible to transmit the turning force from a wrench socket 1 to the bolt head and the nut effectively.
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