2 holes drilled 0.070 in. dia parellel through opposite corners of hex flange, thd counterbored at flange end 0.344 in. dia, 1.100 in. min, 1.113 in. max depth cadmium surface treated flange
2b thread class 32 thread quantity per inch 2 radial notches in flange periphery 180 deg apart, thd counterbored opposite flange 0.165 in. min, 0.174 in. max dia, 0.094 in. depth anodize surface treated flange unc thread series
2b thread class 32 thread quantity per inch 2 radial notches in flange periphery 180 deg apart min, thd counterbored opposite flange 0.165 in. min, 0.174 in. max dia by 0.469 in. max dia by 0.469 in. depth anodize surface treated flange unc thread series