3a 1st end thread class 12 1st end thread quantity per inch mtg flange in lieu of wrenching facility, 2 holes 0.215 in. nom dia, 2.000 in. distance c to c anodize surface treated rigid w/offset wrenching facility unj 1st end thread series
2a thread class right-hand 0.309" thread length 0.471" overall length w/two 0.156 in. w by 0.125 in. dp slots 180 deg apart on top of nut hexagon, external thread, boss