2g thread class right-hand 21.000" thread length hexagon head style 5 thread quantity per inch apply solid film lubricant 0.0002to 0.0005 inch thick per mil-l-46010 phosphate surface treated acme thread series
2a thread class right-hand 0.844" thread length distorted head head style 16 thread quantity per inch 6 slots in top of head at any angle relative to the hexagon unc thread series
