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I found a link to a page which explains the difference in the designation:
http:// w w w .thefreelibrary.com/Casting+answers+&+advice-a0117607593
It infers that the point designation is just a reference to the ingot that the cast part is made from. This is in accordance with the Aluminum Association 'Pink Sheets' standard:
* XXX. 0--casting;
* XXX.1--ingot used to make the casting;
* XXX.2--ingot used to make the casting (having typically Lighter chemical limits than the XXX.1 ingot designation).
The system denotes the chemical composition limits of aluminum alloys and specifies the percentage of each alloying element, of an allowable chemistry range. The system categorizes the alloys by groups (or series) according to their major alloying elements.
The balance of the three-digit number identifies the various individual alloys within each alloy series. Some alloy designations include a letter before the three-digit alloy designation, which distinguishes between alloys that fall within the alloy chemistry ranges, but differ slightly in percentages of alloying elements or impurities.
Table 1. Segment of the Aluminum Association 'Pink Sheet.'
AA # Product Si Fe Cu Mn Mg
The alloy composition is given below:
356.0 S&P 6.5-7.5 0.6 0.25 0.35 0.20-0.45
356.1 Ingot 6.5-7.5 0.50 0.25 0.35 0.25-0.45
356.2 Ingot 6.5-7.5 0.13-0.25 0.10 0.05 0.30-0.45
AA # Product Zn Ti Each Total Aluminum
356.0 S&P 0.35 0.25 0.05 0.15 remainder
356.1 Ingot 0.35 0.25 0.05 0.15 remainder
356.2 Ingot 0.05 0.20 0.05 0.15 remainder
Hope this helps,