2a external thread class right-hand external 0.812" overall length anodize surface treated plug, tube fitting flared (note: drilled hole is optional should not be considered as a separating characteristic unjf external thread series
right-hand external 0.773" overall length lubricant surface treated plug, tube fitting flareless (note: drilled hole is optional should not be considered as a separating characteristic unjf external thread series
2b internal thread class right-hand internal 17 internal thread quantity per inch w/drilled hole in top, 0.190-24 unc-2b thd by 0.120 deep cap uns internal thread series