This recommended practice lists wrenching surface sizes for fluid fittings which utilize unmachined hex bar dimensions or forged flat dimensions on the finished machine parts as wrenching surfaces.
HEXAGON BAR AND FORGED WRENCHING FLAT SIZES FOR FLUID FITTINGS
1980-09-01
Conference paper
English
Fittings , Aluminum alloys , Steel , Parts , Titanium alloys , Corrosion