It has just been brought to my attention that ASTM updated the B16/B16M specification for free-cutting brass in 2010. Previously it only covered UNS C36000 with a lead composition of 2.7 to 3.5%. Now there are two compositions; C36000 with 2.5 to 3% lead and C36010 with lead 3.1 to 3.7%. Neither of the current compositions falls entirely within the range of the old composition.

I've got 8 part drawings that specify ASTM B16/B16M C36000 and I don't want the composition to change. I have no desire to sample & test these components through a full range of qualification testing. The suppliers say they can still buy material to the old composition but of course it no longer meets the spec. I'm trying to decide what is the best course of action. Do I change the drawings to include the year of the last acceptable version of the spec (ASTM B16/B16M - 05) or do I add a note allowing the old lead tolerance of 2.7 to 3.5%?

Any other ideas?

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