Genuine Caterpillar 3/8"-16 Cone lock nut. 410 Stainless steel with coating. Used as a turbocharger mounting lock nut Suitable for - 3508B D330C D353E D353D D353C 3304 3306 D398A D398B 3512 3516 D379A D379B D333C C280-16 C280-12 D399 3612 3616 C18...