NAS4002定义了根据参考本规范的图纸所列零件号采购的合金钢外螺纹紧固件的要求。通常，这些紧固件用于拉伸、剪切和拉伸疲劳应用，其中需要160 KSI Ftu和95 KSI Fsu，工作温度能力达到450°F。采购合同、采购订单、零件标准和/或零件图纸中规定的要求应优先于本文所述的要求。接收承包商可拒收任何不符合要求的批次。本规范包括I型、II型和III型三类紧固件的机械性能要求。

NAS4002 defines the requirements for alloy steel externally threaded fasteners procured under part numbers listed on drawings which refer to this specification. Typically these fasteners are used for tension, shear, and tension fatigue applications where 160 KSI Ftu and 95 KSI Fsu is desired with a service temperature capability to 450° F.Requirements stipulated in purchase contracts, purchase orders, part standards and/or part drawings shall take precedence over requirements stated herein. Receiving contractors may reject any lot which does not conform.The specification includes mechanical property requirements for three classes of fasteners, Types I, II and III.