1.Model NO.:Ram Assembly 2. ... petroleum machinery. We have obtained the technical specifications of the American Petroleum Institute (API6A, 16A) certification ... 8, 2-7/8, 3-1/2, 4, 4-1/2, 5, 5-1/2, 5-3/4, 6 ... variable RAM (2-7/8 to 5, 4-1/2-7”), and double hole RAMPressure: 2,000 ... to 15,000psiSize: 7-1/16 to 21-1/4"U and S type are availableShear ... ! Popular Bop RAM Assembly (Made of Alloy Steel)