FIELD: mechanical engineering; joints such as shaft-hub working under conditions of dynamic loading. SUBSTANCE: sectional key has flat or rounded-off ends and connection strip. Engageable surfaces of separate parts are inclined in such way that angular clearances are formed between separate parts. Each separate part has slot in line of symmetry perpendicularly to cross section of key for fitting said connection strip which consists of longitudinal plates; cross section is maximum in the middle of key length and minimum at the edges; width of said slot is maximum at middle separate parts and minimum at edges. As a result rigidity of key is reduced. EFFECT: enhanced reliability. 6 dwg
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