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SPI #4 Finish vs. SPI A-B-C-D?

I have an old part spec. that calls out an SPI #4 finish. What does that correspond to in the present SPI "A-B-C-D, 1-2-3" finishes?

Rich M [last name deleted for privacy by Editor]
- Sinking Spring, Pennsylvania, USA
2002

March 31, 2008

Hi, Rich. letter 20910 answers your question and offers some background. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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