Revision as of 17:00, 1 February 2023 edit 2603:6081:601:2800:3438:1992:c344:226a (talk) →‎External links: Link to NASA library instead of Scribs. ← Previous edit		Revision as of 11:58, 5 February 2023 edit undo Osunpokeh (talk \| contribs) Extended confirmed users 2,003 edits →‎Major diameter Tag: Visual edit Next edit →
Line 102: ====Major diameter==== The major diameter of threads is the larger of two extreme diameters delimiting the height of the thread profile, as a cross-sectional view is taken in a plane containing the axis of the threads. For a screw, this is its outside diameter (OD). The major diameter of a nut ~~may not~~cannot be directly measured, (as it is obstructed by the threads themselves) but it may be tested with go/no-go gauges. The major diameter of external threads is normally smaller than the major diameter of the internal threads, if the threads are designed to fit together. But this requirement alone does not guarantee that a bolt and a nut of the same pitch would fit together: the same requirement must separately be made for the minor and pitch diameters of the threads. Besides providing for a clearance between the ''crest'' of the bolt threads and the ''root'' of the nut threads, one must also ensure that the clearances are not so excessive as to cause the fasteners to fail.

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