Ductile iron
NSN 6685-01-163-3319
NSN 6105-01-088-8133
NSN 6150-01-159-5476
NSN 7035-00-731-8729
NSN 6685-01-461-2869
NSN 4140-01-391-1974
NSN 5975-01-258-1046
NSN 6645-01-632-1127
NSN 6105-00-482-4584
NSN 6685-00-113-1888
NSN 5965-01-505-1779
NSN 2925-01-036-4213