Ductile iron
NSN 5985-01-312-0499
NSN 5930-00-222-4721
NSN 5960-00-822-9519
NSN 6220-01-072-7575
NSN 5945-00-073-7997
NSN 6130-00-134-0266
NSN 5925-00-432-0546
NSN 5985-01-408-4677
NSN 5990-01-390-2177
NSN 5998-00-432-0472
NSN 5920-01-281-7354
NSN 5915-01-030-9382