封裝尺寸圖的 BSC
先查Google

一說BSC是指基本值(Basic),其它還有TYP(典型值),REF參考值,單位一般會在資料里說明。

二說是Basic Spacing between Centers，

三說BSC不是單位，意思是沒有誤差的，也就是說這間距必須符合前面的值，這個一般在指定兩個腳之間的距離時出現(xiàn)，比如0.050BSC就是 說兩腳間距必須是50mil也就是0.050英寸

Solution 1:
BSC means "Basic Space Between Center".?

The "Drawing Requirements Manual" by Jerome Lieblich (W/C is in compliance with Mil Std 100F) defines BSC as a numerical value that is used to describe the theoretically exact size, shape, or location of a feature or datum target; this is shown on drawings enclosed in a rectangle. It is the basis for determining which permissible variations are established by tolerances on other dimensions.?

Solution 2:
"BSC" is short for BASIC. It is a numerical value used to describe the theoretical exact size, shape or location of a feature or datum target. It is the basis on which permissible variations are established by tolerances on other dimensions, in notes, or by feature control symbols. Basic dimensions are displayed on the drawing enclosed in a rectangle.?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~實際上就是要求這個尺寸值，必須是準確的，不能有誤差，所以不存在 typ, min和max值。

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