heat treat to rockwell C55-C60; two undercut's provided 0.440 from flange, 0.060 wide; two mounting holes 0.156 diameter; two holes provided 0.047 diameter angled 60 deg, located 0.375 from center of flange passivate surface treated blind
heat treat to rc 55-60 per mil-h-6875; surface treat black chrome per mil-p-14538; undercut provided 0.060 wide located 0.340 from flance; counterbored 0.500-20 unf-2b, 0.190 deep passivate surface treated blind