Cres, ams 5643, 17-4ph, 0.358 in. Min, 0.359 in. Max largest od, 0.151 in. Min, 0.157 in. Max h, 4 holes 0.061 in. Min, 0.066 in. Max diameter equally spaced on 0.211 in. Diameter bolt circle, hardness rating h1050 per mil-h-6875, passivated finish per mil-s-5002, 125 microinch finish all over