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