ASTM A108 M ASTM A108 M jasperdad (Mechanical) (OP) 9 Sep 10 08:57 Can anyone tell me what the M is in A-108M. Thank you. I can't find it anywhere on the internet.Thank you RE: ASTM A108 M DiplingAndre (Petroleum) 9 Sep 10 10:32 M means MetricSo all Values are in metric system!Its very common that you have ASTM A 106/A106 M with both values mentioned. RE: ASTM A108 M jbeckhou (Mechanical) 9 Sep 10 11:09 I don't show a listing for A-108M in my list of ASTM specifications. But DiplingAndre is correct. Petrotrim Services RE: ASTM A108 M jasperdad (Mechanical) (OP) 9 Sep 10 11:14 Thank you both very much.