I'm not real familiar with VDFI 8001, but have a copy of an old revision. This revision has ranges stated, similar to AMS 2431/8b. The AMS 2431/8b hardness for all sizes is 90% 55/62 HRC, which would be approximately 90% 595-746 HV. What is the revision level of the VDFI 8001 you are quoting?
