FIELD: machine building.
SUBSTANCE: invention relates to machine building. The proposed fastener represents a screw rod jointed to the head. The said head represents a body of revolution and has two elements for wrench, each being formed by intersection of the body of revolution with two cross-planes. One of the said cross-planes is parallel to the rod axis, while the other one is perpendicular to the first cross-plane. The second cross-planes of each aforesaid element for wrench are arranged in symmetry with respect to the rod axis and intersect at the angle varying from 90 to 140°. The wrench to screw up the said fastener is furnished with a head jointed to the handle. The said head represents a plate with thickness not exceeding the distance between the first cross-planes. The plate free end is furnished with an angular slot with the angle equal to that of intersection of the second cross-planes.
EFFECT: prevention of out unauthorised screwing out.
2 cl, 5 dwg
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