ISO 10303-214:2010(E)

Figure — Arrowleft Figure — Clause 4 Figure — Arrowright

4.2.145 Defined_thread

A Defined_thread is a thread where the shape of the thread is specified by the values of the attributes. A Defined_thread may be an internal or an external thread.

A Defined_thread is a type of Thread_specification.

The data associated with a Defined_thread are the following:

4.2.145.1 crest

The crest specifies the distance between the opposing points of the thread. The crest is formed by the intersection of the sides of the thread if extended, if necessary, beyond the top of the thread.

NOTE It is possible to derive the crest from the form type and the major diameter.

See defined_thread to feature_parameter for the application assertion.

The crest need not be specified for a particular Defined_thread.

4.2.145.2 minor_diameter

The minor_diameter specifies the dimension of the smallest diameter of a Defined_thread.

NOTE 1 It is possible to derive the minor_diameter from the fit class and the major diameter.

NOTE 2 The minor_diameter applies to both an internal and an external thread.

See defined_thread to feature_parameter for the application assertion.

The minor_diameter need not be specified for a particular Defined_thread.

4.2.145.3 pitch_diameter

The pitch_diameter specifies the dimension of an imaginary cylinder passing through the threads so as to make equal the widths of the threads and the widths of the spaces cut by the cylinder.

See defined_thread to feature_parameter for the application assertion.



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