2.5030" bore diameter 12 thread quantity per inch name on drawing is bearing, cap; item has two lubricating grooves 180 degrees apart pillow block, solid un thread series
2a thread class 1.2505" bore diameter 16 thread quantity per inch name on drawing is rod end assembly-mlg actuator; used on b-52 aircraft chromate spherical surface of race insert surface treated ball type with flare un thread series