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- Q624 - General Subjects
171. Which figure shown in the illustration, is the nut lock improperly used
Figures C and E demonstrate improper nut lock usage because the lock does not bear squarely against a flat of the nut, allowing potential rotation. A proper nut lock must provide a positive stop to rotation by firmly contacting a flat side of the nut or seating squarely on the nut; figures A, B, and D correctly illustrate this principle. Therefore, options A, B, and C are incorrect, leaving C and E as the only combination representing improper usage.
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