https://everyspec.com/MS-Specs/MS1/MS16000-MS16999/MS16207C_11111/
MS16207 C BOLTS SQUARE NECK ROUND HEAD UNC-2A ALLOY
Title: MS16207, Version: C, Date: 1967-May-24, Status: Inactive, Desc: BOLTS SQUARE NECK (CARRIAGE BOLT) ROUND HEAD UNC-2A COPPER-SILICON ALLOY NONMAGNETIC (24
square neckround headboltsuncalloy