Used on on486/usm636(;cass. 2b thread class right-hand 40 thread quantity per inch navy special project material nylon zytel 101 ul 94V2; color natural
Used on gen set,ag914,arleigh burke class ddg. right-hand 20 thread quantity per inch two thru holes, .250 ream thrutwo places equally spaced, nut also has two 8-32 tap thru holes