BS Specification  :  BS4865 PART 1 1989

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Table 5 Dimension of gaskets for PN10 flanges
Table 6 Dimension of gaskets for PN16 flanges
Table 8 Dimension of gaskets for PN40 flanges

Dimension to suit for Flange to ANSI B16.5 150 LB

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Table 3 Dimension of gaskets for Class designation 150 flanges