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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
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey

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