Used on ships service generator diesel engine detroit diesel model 6-71 onboard 180 ft wlb coast guard vessels. 2b thread class right-hand 20 thread quantity per inch
Used on B-2SE. 2b thread class right-hand 24 thread quantity per inch nut, rectangular-hole center .375 +.005 or -.010 x .75, r .50 one side top to bottom,
3b thread class right-hand 18 thread quantity per inch 8.0 microin od, rockwell c scale 40.0 min, 45.0 max; two int grooves; three ext flats 120.0 deg apart; coat w/drying type preservative oil phosphate manganese surface treated