M00019813
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SAE J2123_201910 Numbering System for Taps (Stabilized: Oct 2019)
standard by SAE International, 10/09/2019
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Availability date: 07/25/2021
This SAE Recommended Practice provides a systematic method for the identification of ground thread taps for inch sizes up to 9.999 in with a Maximum Thread-per-Inch of 99.9, and Metric sizes up to 99.9 mm with a Maximum pitch of 9.99 mm. It is intended to assist in the cataloging and supplying of these tools. It is not intended for ACME, Buttress, or similar type thread forms.