FIELD: mechanical engineering; fasteners.
SUBSTANCE: proposed fastener has head and cylindrical body. Spline is made in head in form of continuous slot consisting of two straight-line side sections and middle part made symmetrical relative to vertical axis of fastener lying on one straight line with side straight-line sections. Depth of side sections of spline is equal to one third of head height, and depth of middle part of spline is 0.8 Hh where Hh is height of fastener head.
EFFECT: improved reliability of centering of tool at turning in and out of fasteners.
3 dwg
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