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For some applications even Grade 8 may not quite meet the needs, if that is the case then L9 of F911 high strength bolts are the next step up, with a ~180,000psi minimum tensile strength; these bolts are often noted as “Grade 9” because of the 9 lines or dots on the head of the bolt, the lines/dots are used to identify similarly to Grade 5 or 8, except there are 9 total markings, instead of the standard configuration of 3(+2) for Grade 5 or 6(+2) for Grade 8. These bolts are excellent where high strength is the most critical feature, for the most high stress applications with extreme conditions. The strength of these bolts comes from a special alloy; 8640, which had previously been used solely for aerospace grade bolts, but the alloy is more commercially available now, giving users who require even more strength than Grade 8 options. The “Grade 9” bolts are often used in extreme automotive sports like competitive off-road or drag racing. Used with wrench or socket in threaded holes, or with a lockwasher/flatwasher and hex nut.