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Meaning of "UIN" as applied to surface prep 1

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Spiketa152

Structural
Joined
May 17, 2005
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Location
US
Can anyone tell me what "UIN" means as applied to surface
prep for moment connections?
 
"The roughness of a surface is measured in micro inches (uin), or micrometers (um). One micro inch is equal to one one-millionth of an inch, as one micrometer equals one one-millionth of a meter. The translation from standard to metric is: one micro inch =.025 micrometer; from metric to standard, one micrometer= 40 micro inches. Within this scale every surface has roughness."

A google search provided this result. hope it helps.
 
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