Used on 5411-01-436-3326;shelter,nonexpandable,lightweight,multipurpose. 2b thread class right-hand 18 thread quantity per inch nut has flats on o.d., length between flats is 1.750 in nom.
Used on nosepiece assembly; w/s: virginia class submarine, ssn-774. 2b thread class right-hand 13 thread quantity per inch boss does not exist--sleeve is threaded completely through; shape is rectangular (1.0" long x 1.5" wide x 1.063" high) with intersecting hole placed centered along the 1.0 inch side