Used on sentinel class fast response cutter b (frc-b). right-hand 20.0mm thread length button head style M6 x 1 X20 mm ss shcs pdcn SE0953; next higher assembly 2010-01-627-9761, propeller, marine, p/n 931914 m thread series
2a thread class right-hand 0.178" thread length pan head style 32 thread quantity per inch pan head captive screw passivate screw surface treated unc thread series