SBAC TS 27 Issue 4 (2004) Manufacturing Specification For Studs, Bolts And Screws In Bs Hr601 (nimonic) Material 1000 Mpa (145,000 Lbf/in[2]) Tensile At Room Temperature - (for Which Forging Is Optional And Qualification Not A Requirement) Gives the requirements for studs, bolts and screws in BS HR601 material (for which forging is optional and qualification not a requirement).