2a 1st end bulkhead thread class 12 1st end bulkhead thread quantity per inch cadmium surface treated flaremess w/ bulkhead threads un all ends thread series
3a 1st end bulkhead thread class 12 1st end bulkhead thread quantity per inch anodize surface treated flared w/ bulkhead thread unj 1st end bulkhead thread series
3a all ends thread class drilled for lock wire 0.064 min 0.076 max in. dia passivate surface treated flared w/ center wrenching facility unf all ends thread series
3a all ends thread class color yellow; threaded 0.250-unc-2a thd size; 0.250 in. dia, 0.250 in. lg passivate surface treated flared w/ center wrenching facility unjf all ends thread series