| Attribute | Type | Defined By | 
|---|
| item_number | INTEGER | structural_frame_item | 
| item_name | label (STRING) | structural_frame_item | 
| item_description | text (STRING) | structural_frame_item | 
| life_cycle_stage | label (STRING) | structural_frame_product | 
| fastener_grade | label (STRING) | fastener | 
| nominal_diameter | positive_length_measure_with_unit (ENTITY) | fastener_simple | 
| nominal_length | positive_length_measure_with_unit (ENTITY) | fastener_simple | 
| length_of_shank | positive_length_measure_with_unit (ENTITY) | fastener_simple_bolt | 
| bolt_preload | force_measure_with_unit (ENTITY) | fastener_simple_bolt | 
| full_section_area | area_measure_with_unit (ENTITY) | fastener_simple_bolt | 
| reduced_section_area | area_measure_with_unit (ENTITY) | fastener_simple_bolt | 
| bolt_head_height | positive_length_measure_with_unit (ENTITY) | fastener_simple_bolt_square_head | 
| distance_across_flats | positive_length_measure_with_unit (ENTITY) | fastener_simple_bolt_square_head |