ISO 10303-214:2010(E)

Figure — Arrowleft Figure — Clause 4 Figure — Arrowright

4.2.539 Thread_specification

A Thread_specification is a set of parameters specifying a thread independent from its application.

Each Thread_specification is a Defined_thread or a Catalogue_thread.

The data associated with a Thread_specification are the following:

4.2.539.1 density

The density specifies the number of threads per the axial unit of length of measure.

See thread_specification to feature_parameter for the application assertion.

4.2.539.2 fit_class

The fit_class specifies the class of fit for the thread. The class as defined in ISO 965-1 shall be used.

EXAMPLE Examples for fit_class are '4e' and '2E'.

4.2.539.3 form_type

The form_type specifies the kind of thread.

Where applicable the following values shall be used:

4.2.539.4 hand

The hand specifies if the thread is right or left handed.

The following values shall be used:

When viewed toward an end, a right hand winds in a clockwise direction and a left hand winds in a counter-clockwise direction.

4.2.539.5 inner

The inner specifies if it is an inner or outer thread. A value of 'true' indicates that it is a thread in a hole; a value of 'false' indicates that it is a thread on a shaft.

4.2.539.6 major_diameter

The major_diameter specifies the dimension of the largest diameter of a thread.

See thread_specification to feature_parameter for the application assertion.

4.2.539.7 qualifier

The qualifier specifies the thread as text.

EXAMPLE 'M 20', 'Tr 40 × 7', 'G 3/4', or 'R 1/2' are examples for the qualifier.

EXAMPLE The number of parallel helixes a thread consists of is an example for the use of the qualifier.

The qualifier need not be specified for a particular Thread_specification.

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