ISO 10303-214:2010(E)
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:
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.
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'.
The form_type specifies the kind of thread.
Where applicable the following values shall be used:
NOTE 1 General purpose metric threads are defined in ISO 261
NOTE 2 Pipe threads of type 'R' are defined in ISO 7
NOTE 3 Metric trapezoidal threads are defined in ISO 2902
NOTE 4 Pipe threads of type 'G' are defined in ISO 228
The hand specifies if the thread is right or left handed.
The following values shall be used:
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.
The major_diameter specifies the dimension of the largest diameter of a thread.
See thread_specification to feature_parameter for the application assertion.
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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