Image: Marks 1916 p667 American Screw Co standard

Description: A table of standard sizes for machine screws as provided by the American Screw Company of Providence, Rhode Island, USA, and published in a 1916 handbook (Mechanical Engineers' Handbook). Standards seen here overlap with those found elsewhere marked as ASME and SAE standards and with the later Unified Thread Standard (UTS) of 1949 and afterward. One can see the theme of how later standards reflect a degree of continuation from earlier standards, sometimes with hints of long-ago intracompany origins. For example, compare the 6-32, 8-32, 10-24, and 10-32 options in this table with the UTS versions of those sizes, which are not identical but are so close that interchange would work.
Title: Marks 1916 p667 American Screw Co standard
Credit: Mechanical Engineers' Handbook[1], McGraw-Hill, 1916, page 667
Author: Lionel S. Marks
Usage Terms: Public domain
License: Public domain
Attribution Required?: No