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The clearance, in a radial direction, between the crest of the thread of a screw and the root of the thread with which the screw mates.



Related Terms

DEPTH OF THREAD

The distance, in a radial direction, from the crest of a screw thread to the base.

MAJOR DIAMETER

The largest diameter of a screw thread, measured at the crest for an external (male) thread and at the root for an internal (female) thread.

THREAD DEPTH

The vertical distance from the root to the crest of the thread.

MINOR DIAMETER

The diameter of a minor diameter minor loop cylinder bounding the root of an external thread or the crest of an internal thread.

THREAD CREST

The top or peak of each thread.

THREAD ROOT

The bottom of the groove of each thread.

AMERICAN STANDARD SCREW THREAD

Screw thread whose dimensions conform to those of a particular series of specified sizes established as a standard in the United States; used for bolts, nuts, and machine screws.

ADAPTER SLEEVE

An axially slotted sleeve with cylindrical bore, tapered outside surface and male screw thread at small end used with locknut and lockwasher for mounting of bearings with tapered bore on cylindrical outside surface of shaft. Also called pull-type sleeve.

WITHDRAWAL SLEEVE

An axial slotted sleeve with cylindrical bore, tapered outside surface and male screw thread at large end. Used for mounting and dismounting (by means of nut) of bearing with tapered bore on cylindrical outside surface of shaft. Also called push-type sleeve.

RADIAL ERROR

In a two-dimensional or elliptical error distribution, the measure of error as the radius of a circle of equivalent probability derived from the error ellipse. The error, expressed as l drms, is the square root of the sum of the error components along the major and minor axes of the probability ellipse. The use of radial error or drms error as a measure of error is somewhat confusing because the term does not correspond to a fixed value of probability for a given value of the error measure.

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