SBAC TS 109 Issue 5 (2004) Manufacturing Specification For Studs, Bolts And Screws In Bs Hr650, En 2398, En 2399 And En 3639 Material 900 Mpa (130,000 Lbf/in[2]) Tensile At Room Temperature (for Which Forging Is Optional And Qualification Not A Requirement) Provides the requirements for studs, bolts and screws in BS HR 650, EN 2398, EN 2399 and EN 3639 material (for which forging is optional and qualification not a requirement).