| Selected Military Specifications |
| Chemical Composition Ranges and Limits |
MIL |
C |
Mn |
P Max |
S Max |
Si |
Cr |
Ni |
Mo |
Nearest Equivalent |
| AMS |
SAE No. |
| S-5000 |
.38/.43 |
.65/.85 |
.025 |
.025 |
.15/.35 |
.70/.90 |
1.65/2.00 |
.20/.30 |
6415 |
E4340 |
| S-507831 |
1.00/1.15 |
1.60/1.90 |
.035 |
.040 |
.70/1.00 |
.20 max |
.25 max |
.06 max |
— |
— |
| S-5626 |
.38/.43 |
.75/1.00 |
.025 |
.025 |
.20/.35 |
.80/1.10 |
.25 max |
.15/.25 |
6382 |
4140 |
| S-6049 |
.38/.43 |
.75/1.00 |
.025 |
.025 |
.20/.35 |
.40/.60 |
.40/.70 |
.20/.30 |
638740 |
— |
| S-6050 |
.28/.33 |
.70/.90 |
.025 |
.025 |
.20/.35 |
.40/.60 |
.40/.70 |
.15/.25 |
6280 |
8630 |
| S-67092 |
.38/.43 |
.50/.70 |
.025 |
.025 |
.20/.40 |
1.40/1.80 |
— |
.30/.40 |
6470 |
— |
| S-6758 |
.28/.33 |
.40/.60 |
.025 |
.025 |
.20/.35 |
.80/1.10 |
.25 max |
.15/.25 |
637 |
4130 |
| S-71083 |
.23/.28 |
1.20/1.50 |
.040 |
.040 |
1.30/1.70 |
.40 max |
1.65/2.00 |
.35/.45 |
6418 |
4625M4 |
| S-7393 |
.08/.13 |
.45/.60 |
.015 |
.015 |
.20/.35 |
1.25/1.75 |
3.25/3.75 |
— |
6250 |
3310 |
| |
.14/.19 |
.45/.60 |
.025 |
.025 |
.20/.35 |
1.25/1.75 |
3.25/4.00 |
— |
— |
3316 |
| |
.07/.13 |
.40/.70 |
.025 |
.025 |
.20/.35 |
1.00/1.40 |
3.00/3.50 |
.08/.15 |
— |
9310 |
| S-7420 |
.95/1.10 |
.25/.45 |
.025 |
.025 |
.20/.35 |
1.30/1.60 |
— |
— |
6440 |
52100 |
| S-85035 |
.48/.53 |
.70/.90 |
.025 |
.025 |
.20/.35 |
.75/1.20 |
— |
— |
6448 |
6150 |
| S-86904 |
.18/.23 |
.70/1.00 |
.025 |
.025 |
.20/.35 |
.40/.60 |
.40/.70 |
.15/.25 |
6274 |
8620 |
| S-86953 |
.34/.41 |
.60/1.00 |
.040 |
.040 |
.20/.35 |
— |
— |
.20/.30 |
6300 |
4037 |
| S-86993,6 |
.28/.33 |
.80/1.00 |
.040 |
.040 |
.20/.35 |
.75/.95 |
1.65/2.00 |
.35/.50 |
6427 |
4330M4V1 |
| S-8707 |
.38/.43 |
.70/.90 |
.040 |
.040 |
.20/.35 |
.70/.90 |
.85/1.15 |
.20/.30 |
6342 |
9840 |
| S-8844-1 |
.38/.43 |
.65/.90 |
.010 |
.010 |
.15/.35 |
.70/.90 |
1.65/2.00 |
.20/.30 |
— |
4340 |
| S-8844-36 |
.40/.45 |
.65/.90 |
.010 |
.010 |
1.45/1.80 |
.70/.95 |
1.65/2.00 |
.35/.45 |
— |
300M |
| T-5066 |
.22/.28 |
.30/.60 |
.025 |
.025 |
.30 max |
— |
— |
— |
— |
1025 |
| S-115957 |
.48/.55 |
.75/1.00 |
.040 |
.040 |
.20/.35 |
.80/1.10 |
— |
.15/.25 |
— |
4150 |
| S-115957 |
.47/.55 |
.70/1.00 |
.040 |
.05/.09 |
.20/.35 |
.80/1.15 |
— |
.15/.25 |
— |
41R50 |
| S-115957,8 |
.41/.49 |
.60/.90 |
.040 |
.040 |
.20/.35 |
.80/1.15 |
— |
.30/.40 |
— |
4142M3V2 |
| S-460478 |
.38/.45 |
.75/1.00 |
.025 |
.020 |
.20/.35 |
.95/1.25 |
— |
.55/.70 |
— |
— |
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| NOTE: | Aircraft quality steels except where indicated. |
| | Cu = .35 max unless specified. |
1 Al = .020 max.
2 Al = .95/1.35.
3 P & S = .025 max if Basic Electric Furnace Steel is specified.
4 P & S = .015 max if consumable vacuum melted steel is specified.
5 V = .15 min.
6 V = .05/.10.
7 Al = .040 max.
8 V = .20/.30.
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