3a 2nd end thread class 12 all ends thread quantity per inch 37 deg sealing surface shall be free of anodize aluminum surface treated unj all ends thread series
3a 2nd end thread class 12 2nd end thread quantity per inch fitting shall be polytetrafluoroethylene coated on internal surface only to a distance of 0.365 min 0.380 max in. into bore passivate surface treated unj 2nd end thread series
Used on aircraft, hornet f/a-18. 3a 2nd end thread class 24 2nd end thread quantity per inch weapon system essential phosphate fluoride surface treated unjs 2nd end thread series