本标准涵盖了被公认为美国国家标准的各种类型的开槽有头螺钉、方头和开槽无头紧定螺钉的完整通用数据和尺寸数据。附件还包括有头螺钉的螺纹跳动套筒量规、平沉头有头螺钉的凸出测量、尺寸数据所依据的公式以及方头固定螺钉的扳手开口。但是，应理解，如果出现有关产品验收的问题，表格中的尺寸应取代通过公式重新计算的尺寸。 本标准中包含的尺寸数据并不意味着所描述的所有产品都是库存生产尺寸。消费者应就产品的可用性与供应商协商。

This Standard covers the complete general and dimensional data for the various styles of slotted head cap screws and square head and slotted headless set screws recognized as American National Standard. Also included are appendices covering thread runout sleeve gages for cap screws, protrusion gaging of flat countersunk head cap screws, formulas on which dimensional data are based, and wrench openings for square head set screws. It should be understood, however, that where questions arise concerning acceptance of a product, the dimensions in the tables shall supercede those recalculated by formula. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with suppliers concerning availability of products.