| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an arrowhead capable of suppressing rusting, preventing deformation due to abrasion, and having superior straight advancing performance with high specific gravity. Ž<P>SOLUTION: Cemented carbide (JIS M3916) as a sintered body of hard metallic carbide is used in this arrowhead 1, and is ground, thus the arrowhead of a structure having a smooth surface and uniform thickness, having coaxiality accuracy of inner and outer peripheral face shaft centers of 0.05 mm or less, can be provided. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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