Screwed connection having improved fatigue strength

Details Screwed connection having improved fatigue strength Screwed connection having improved fatigue strength

1978-03-28

1980-02-26

Britts, Ramon S.

F16B 3300

Patent

active

041899750

ABSTRACT:
A screw-bolt having crest-cut-off threads with their heights progressively decreased to not more than 3/4 times the basic height in the screwing up direction at a gradient ranging from 60/100 to 3/100 over that of the axial length of the threaded part of the bolt which is located between the unthreaded part and the complete thread upon setting up engagement with a nut therefor to allow a fraction of 0.1 to 0.2 unengaged with the nut, whereby the fatigue strength is increased in terms of the endurance limit from 6 kg/mm.sup.2 for the prior art bolt and nut to more than 11 kg/mm.sup.2 independently of whether SCM 14 or SNCM 5 steel is used in making the bolt and nut.

REFERENCES:
patent: 2267923 (1941-12-01), Johnson
patent: 2514589 (1950-07-01), Penman
patent: 2587544 (1952-02-01), Sneddon
patent: 2772102 (1956-11-01), Webb
patent: 3245142 (1966-04-01), Williams
patent: 3418012 (1968-12-01), La Torre

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