TM 1-1500-204-23-6 Table 4-1.  Designation for Alloy Groups Aluminum 99.00 percent minimum and greater major alloying element ................................  1xxx Aluminum Copper ................................ ................................ ................................ ................  2xxx alloys Manganese................................ ................................ ................................ .......... 3xxx grouped Silicon ................................ ................................ ................................ .................  4xxx by major Magnesium................................ ................................ ................................ .......... 5xxx alloying Magnesium and silicon ................................ ................................ ........................  6xxx elements Zinc ................................ ................................ ................................ .....................  7xxx Other elements................................ ................................ ................................ .... 8xxx Unused series ................................ ................................ ................................ ............................  9xxx Table 4-2.  Aluminum Alloy Designation Conversions (Old to New) Old New Old New Old New alloy alloy alloy alloy alloy alloy ¹99.3 1230 17S 2017 56S 5056 99.6 1160 A17S 2117 XC56S X5356 ²99.75 1175 18S 2018 C57S, K157 5357 99.87, EBIS 1187 B18S 2218 61S 6061 ³EC EC F18S 2618 62S 6062 AA 1S 1095 24S 2024 63S 6063 BA1S 1099 25S 2025 66S 6066 CA1S 1197 B25S 2225 70S 7070 AB1S 1085 32S 4032 72S 7072 EB1S,9987 1187 43S,K145 4043 75S 7075 FB1S 1090 C43S, 44S, K143 4343 B77S 7277 AC1S 1070 XE43S X4543 XA78S X7178 CC1S, R998 1180 45S 4045 K112 8112 JC1S 1075 50S 5050 K143, C43W, 44S 4343 AD1S 1050 A50S,K155,R305 5005 K145,43S 4043 BD1S 1060 XD50S X5405 K155, A50S, R305 5005 CD1S, 99.6 1160 A51S 6151 K157,C57S 5357 ED1S 1150 XB51S X6251 K160, J51S 6951 AE1S 1030 J51S,K160 6951 ⁴K162,R306 6003 BE1S 1145 52S 5052 LK183 5083 2S 1100 F25S 5652 K186 5086 3S 3003 53S 6053 R301, Core, 14S 2014 4S 3004 B53S 6253 R305, K155, A50S 5005 XA5S X3005 XD53S X6453 ⁴R306, K162 6003 11S 2011 E53S 6553 ⁵R308 1130 14S, R301, Core 2014 A54S 5154 R399 8099 XB14S X2214 B54S 5254 R995 1235 XC16S X2316 X55S X5055 R998, CC1S 1180 See footnotes at end of table. 4-2