Used on aircraft application. 3b thread class right-hand 12 thread quantity per inch w/2 0.061 in. dia lockwire holes, 0.309 in. from thd end anodize surface treated
Used on f4j,f4k,f4m and f4s aircraft. 3a all ends thread class 2.791" overall length anodize body surface treated male coupling half unf all ends thread series