3a all ends thread class 12 all ends thread quantity per inch drilled for lockwire 0.064 min 0.076 max in. dia passivate surface treated flared w/ center wrenching facility un all ends thread series
3b all ends thread class rd mtg flange 2.313 in. dia, with 4 bolt holes 0.220 min, 0.226 in. max dia of bolt holes, welded 0.313 in. from end passivate surface treated plain w/tapered ends unjf all ends thread series
3a all ends thread class 12 all ends thread quantity per inch 1st end bulkhead 1.062-12 in., un, cl 3a anodize surface treated un all ends thread series