Home Forums General Discussion Specifications J444 grit size methods min-min or min-max

---Response from Bob Gillespie---
Jack:

Joe Curran has a good point. Table 1 in SAE J444 is for Cast Shot sizing
and uses the min-min designation. It also indicates in the footnote of
Table 1 that the sieves used "Corresponds to ISO Recommendations", so there
appears to be an effort to agree with ISO. Table 2 is for Cast Grit sizing
with the same ISO footnote. However, it does not indicate either min-min
or max-min for the cumulative % values in Table 2. One could assume that
since Table 1 uses min-min values, Table 2 would also. According to Joe
Curran, this would put SAE J444 in conflict with ISO. If the max-min
values are less confusing and also used by ISO, I would think J444 should
adapt the max-min values as well, and clearly state them in both Tables 1
and 2. I do not have a copy of ISO 6106, so I cannot be certain of the
values in it.