AATB federal item identification guide code

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AATB is the Federation Item Identification Guide code for the “width between flats” specification.

Definition A measurement between he parallel flat surfaces of either an internal, or external he'd or drive style of a threaded fastener.
Instructions Enter the applicable Reply Codes from Table 1 below, followed by the numeric value. A default of “nominal” will be used if no leading Reply Code is provided.
Note The numeric value must be entered in millimetres.
Table 1
Code Defintion
A Nominal
B Minimum
C Maximum

Examples[edit source]

 
Stand-alone formats
This →   {{AATB-FIIG-code/designation | A5.0 }}   renders as →   5.0 mm (0.20 in) nominal
This →   {{AATB-FIIG-code/designation | B10 }}   renders as →   10 mm (0.39 in) min.
This →   {{AATB-FIIG-code/designation | C7.75 }}   renders as →   7.75 mm (0.305 in) max.
This →   {{AATB-FIIG-code/designation | 10.5 }}   renders as →   10.5 mm (0.41 in) nominal
This →   {{AATB-FIIG-code/designation | 2.5 }}   renders as →   2.5 mm (0.098 in) nominal
 
In “Technical Characteristics” table formats
This →   {{specification-table row | AATB | A5.0 }}   and;
This →   {{specification-table row | AATB | B10 }}   and;
This →   {{specification-table row | AATB | C7.75 }}   and;
This →   {{specification-table row | AATB | 10.5 }}   and;
This →   {{specification-table row | AATB | 2.5 }}   renders as:
Code Specification Designation
AATB Width between flats 5.0 mm (0.20 in) nominal
AATB Width between flats 10 mm (0.39 in) min.
AATB Width between flats 7.75 mm (0.305 in) max.
AATB Width between flats 10.5 mm (0.41 in) nominal
AATB Width between flats 2.5 mm (0.098 in) nominal