We supply bushing made from malleable iron.
ASME16.3: Malleable iron threaded pipe unions ASTM 197: Standard Specification for Cupola Malleable Iron , Cupola malleable iron, Malleable iron castings ASME B16.14 Ferrous Pipe Plugs, Bushings and Locknuts with Pipe Threads. ASME B1.20.1 NPT pipe threads
2" x 1/2" and 2" x 3/4" and other sizes available Ball Blast Surface
The picture below shows we used a thread gauge to check product quality.
NPT Thread (ASME B1.20.1):