- 350 St. SCREW, HEX .250-28 UNJF – 3A x .375 L --> Material Hastelloy X - 150 St. BOLT, HEX HEAD, .500-20 UNJF – 3A x 1.375 L --> Material A286, AMS 5731 - 210 St. BOLT, HEX HEAD, .250-28 UNJF – 3A x 1.000 L --> Material A286, AMS 5731 - 160 St. BOLT, HEX, .500-20 UNJF – 3A x 1.375 L --> Material A193 B6 - 220 St. BOLT, HEX HEAD, .250-28 UNJF -3A x 2.000 L --> Material A193 B6