2b thread class right-hand 0.620" thread length 20 thread quantity per inch optional cross-sectional shape octagonal; one hole 0.125 in. dia centered on closed end chromate surface treated
3b thread class right-hand 28 thread quantity per inch nut portion only lubricated with molybdenum disulfide, MOS2 cadmium washer or chromate washer surface treated
3.406" hole diameter 4.932" outside diameter 0.170" material thickness navy special project one slot in outside dia of recessed end; groove on inside washer face recessed
