All three are DaimlerChrysler Engineering Standards. MS-5479 specifies the requirements for carburized high-strength serrated studs. PS-6151 specified the identification requirements for metric fasteners, and PS-7099 is a general fastener specification. MS-5479 also references a number of other standards such as DCX PF-5188 and SAE J1102. DaimlerChrysler Engineering standards can be obtained directly from DCX via Covisint.