F fisher2 Joined Oct 28, 2014 Messages 134 Feb 16, 2015 #1 Does anyone know what the conversion of what the sapphire stone is to the naniwa grading system?
O olpappy Joined Dec 6, 2004 Messages 1,241 Feb 16, 2015 #2 Japanese stones follow JIS grit system, which is different from ANSI. You should be able to finds charts of both with search engines.
Japanese stones follow JIS grit system, which is different from ANSI. You should be able to finds charts of both with search engines.