TM 1-1500-204-23-6 Table 4-6.  Aluminum Alloy Types - CONT Commercial Current Superseded designation specification Composition Alloy Temper specification Castings - continued 4 195 T7 AN-A-33, 5 214 F AN-A-35, 6 142 T21 AN-A-39, 6 142 T571 and 7 122 T2 AN-A-40 5 122 T61 8 108 F 8 108 T55 9 113 F 10 355 T6 10 355 T51 10 355 T7 10 355 T71 16 220 T4 17 40E T5 17 40E T5 18 Allcast F 18 Allcast T6 ... 319 F ... 319 T5 ... 319 T6 20 Red X-8 F 20 Red X-8 T6 21 T1 T5 Permanent and QQ-A-596 1 113 F AN-A-23, Semi-Permanent (Specify 2 122 T551, T65 AN-A-25, Mold Castings Composition 3 142 T571, T61 AN-A-32, and Temper) 4 B195 T4, T6, T7 AN-A-34, 5 A108 F AN-A-36, 6 355 T6, T51, and T62, T71 AN-A-41 7 43 F 8 356 T6, T7 9 A132 T551, T65 10 B132 T5, T6 11 319 F, T6 12 T5 13 T5 14 T5, T7 15 750 T5 16 A214 F 17 333 F, T5, T6, T7 18 357 T6 19 A750 T5 20 B750 T5 4-11