2b thread class right-hand 18 thread quantity per inch nut is corrosion & heat resistant; solution is heat treated using alumizite 'z' aluminum surface treated
Used on ASDS. 0.193" hole diameter 0.334" outside diameter 0.047" material thickness navy special project washer, no. 10 (.190) anodize surface treated split helical-right hand
Used on ASDS. 2.875" hole diameter 4.310" outside diameter 0.650" material thickness drawing calls this: washer - half spherical convex, support post convex
Used on ASDS. 3.120" hole diameter 4.310" outside diameter 0.660" material thickness drawing calls this: washer - half spherical concave, support post concave