This SAE Recommended practice provides a systematic method for the identification of single diameter drills. It is intended to assist in the cataloging and supplying of these tools. NOTE 1: Caution must be taken when assigning codes for designators to prevent specifying drills that cannot be physically or economically manufactured. NOTE 2: In particular without limitation, SAE disclaims all responsibility for the accuracy or completeness of information contained within this report if the standards of this report are retrieved, combined, or used in connection with any software.