FIELD: mechanics.
SUBSTANCE: radial tightening between internal and external exists between guide sides inclined at an angle relative to threads axis wherein mutually interacting surfaces are located at a radial distance from envelope external tooth slot profile formed by concave rounded sections. This is why micro-fractures caused by friction between aforesaid surfaces in motion of external and internal thread elements relative to each other are not subjected to stretching loads acting along the external thread slot profile edges.
EFFECT: higher joint fatigue strength.
29 cl, 7 dwg
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