The OE B58 Fasteners are TTY (Torque to Yield) This is BMWs way of torqueing bolts to a standard. In the after market world, this bolt will not hold up up high performance. 
 
8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.
 
Comes in packs of 8
Torque value 95 FT/Lbs