1.1.1 This Standard contains complete dimensional,mechanical, and performance requirementsfoc Metric Series Hexagon Socket Head ShoulderScrews with nominal shoulder diameters from 6.5 mmto 25 mm recognized as American National Standard.Also included are appendices covering formulas fordimensions, part numbering system and preferredsizes for government use, and thread dimensions.1. I .2 The inclusion of dimensional data in thisStandard is not intended to imply that all of the productsdescribed are stock production sizes. Consumersshould consult with manufacturers concerning lists ofstock production sizes.