FIELD: machine building.
SUBSTANCE: invention relates to fasteners. The proposed bolt has a heat and rod and is intended for screwing in, for example, a nut. The bolt rod comprises a constant-diametre part arranged on the distant end and a guiding part arranged on the bolt front part and having the diametre smaller, if compared with that of the said constant-diametre part. The ledge formed on the guiding part represents a reversed screw configuration relative to aforesaid ledge arranged on the constant-diametre part. As a result, the bolt may not be tightened unless it comes into appropriate position relative to, for example, nut.
EFFECT: eliminating jamming on inner-thread element.
3 cl, 7 dwg
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