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Chemical composition requirements level materials CMnPSCSiCrNiMoTiCb and Ta%Se other 1 carbon ≥ 0.15 ≤ 1.00 ≤ 0.040 ≤ 0.050 ≤ 0.40 2, 2HM and 2H carbon ≥ 0.40 ≤ 1.00 ≤ 0.040 ≤ 0.050 ≤ 0.40 4 carbon, molybdenum 0.40-0.500.70-0.90≤0.035≤0.0400.15-0.350.20-0.30 3AISI501≥0.10≤1.00≤0.040≤0.030≤1.004.0-6.00.40-0.65 6AISI410≤0.15≤1.00≤0.040≤0.030≤1.0011.5-13.5 6F AISI416 sulfur increase≤0.15≤1.25≤0.060≤0.15≤1.0012.0-14.0 6FAISI416 plus selenium≤0.15≤1.25≤0.060≤0.060≤1.0012.0-14.0≥0.15 7, 7MAISI4140/4142/4145,4140H,4142H,4145H0.37-0.490.65-1.10≤0.04≤0.040.15-0.350.75-1.200.15-0.25 8, 8AAISI 304≤0.08≤2.00≤0.045≤0.030≤1.0018.0-20.08.0-11.0 8C, 8CAAISI 347≤0.08≤2.00≤0.045≤0.030≤1.0017.0-19.09.0-12.0≥10X Carbon content 8M, 8MAAISI 316≤0.08≤2.00≤0.045≤0.030≤1.0016.0-18.010.0-14.02.00-3.00≥5X Carbon content 8T, 8TAAISI 321≤0.08≤2.00≤0.045≤0.030≤1.0017.0-19.09.0-12.0 8F, 8FAAISI 303 Sulfur increase≤0.15≤2.00≤0.20≥0.15≤1.0017.0-19.08.0-11.0 8F, 8FAAISI 303 Add selenium≤0.15≤2.00≤0.20≥0.15≤1.0017.0-19.08.0-11.0≥0.15 8P, 8PAAISI 305 Carbon limit≤0.08≤2.00≤0.045≤0.030≤1.0017.0-19.011.0-13.0 8N, 8NAAISI 304N≤0.08≤2.00≤0.045≤0.030≤1.0018.0-20.08.0-11.0 Nitrogen 0.10-0.16 8LN, 8LNAAISI 304N carbon limit ≤0.030≤2.00≤0.045≤0.030≤1.0018.0-20.08.0-11.0 nitrogen 0.10-0.16 8MN,8MNAAISI 316N≤0.08≤2.00≤0.045≤0.030≤1.0016.0-18.010.0-13.02.00-3.00 Nitrogen 0.10-0.16 8MLN, 8MLNAAISI 316N carbon limit ≤0.030≤2.00≤0.045≤0.030≤1.0016.0-18.010.0-13.02.00-3.00 nitrogen 0.10-0.16 8R, 8RADXM19≤0.064.0-6.0≤0.045≤0.030≤1.0020.5-23.511.5-13.51.50-3.000.10-0.30Nitrogen 0.20-0.40Vanadium 0.10-0.30 8S, 8SA≤0.107.0-9.0≤0.060≤0.0303.5-4.516.0-18.08.0-9.0Nitrogen 0.08-0.18 8MLCuN, 8MLCuNAS31254≤0.020≤1.00≤0.030≤0.010≤0.8019.5-20.517.5-18.56.0-6.5 Nitrogen 0.18-0..22 Copper 0.50-1.00 9C, 9CANO8367≤0.030≤2.00≤0.040≤0.030≤1.0020.00-22.0023.50-25.506.0-7.0 Nitrogen 0.18-0..22 Copper 0.75 16 Chromium Molybdenum Vanadium 0.36-0.470.45-0.70-≤0.035≤0.0400.15-0.350.80-1.150.50-0.650.25-0.35 Aluminum B≤0.015 Hardness requirements: Nominal diameter Number of teeth per inch Stress cross-sectional area (in 2) Guaranteed load (pounds) A Grade 1 2, 2HM, 6 6 6F, 7M Grade 2H, 3, 4, 7, 16 Various types of 8; and Grades 9C and 9CA Heavy hex B Hex C Heavy hex D Hex E Heavy hex F Hex G Heavy hex H Hex I 1/4200.031641303820477043005570477025402380 5/16180.052468106290786070709170786041903930 3/8160.07741008093001162010460135601162062005810 7/16140.106313820127601594014350186001594085007970 1/2130.14191845017030212801916024830212801135010640 9/16120.1822366021840273002457031850273001456013650 5/8110.2262938027120339003051039550339001808016950 3/4100.3344342040080501004509058450501002672025050 7/890.4626006055440693006237080850693003696034650 180.60678780727209090081810106000909004848045450 11/880.790102700948001185001067001382001185006320059250 11/481.0001300001200001500001350001750001500008000075000 13/881.2331602001480001850001665002158001850009864092450 11/281.492194000170040223800201400261100223800119360111900 Proof load for use with threaded mandrels (metric) Nominal diameter pitch stress cross-sectional area (mm2) Proof load (kN) A Class 1 2, 2HM, 6 6 6F, 7M Class 2H, 3, 4, 7, 16 Various types of Class 8; and Class 9C and 9CA Heavy hex B Hex C Heavy hex D Hex E Heavy hex F Hex G Heavy hex H Hex I M61.020.118.016.620.818.729.220.811.110.4 M81.2536.632.830.237.934.044.137.920.118.8 M101.5058.051.947.960.053.969.960.031.929.9 M121.7584.375.569.587.378.4101.687.346.443.4 M142.0115.0102.994.9119.0107.0138.6119.063.359.2 M162.0157.0140.5129.5162.5146.0189.2162.586.480.9 M202.5245.0219.3202.1253.6227.8295.2253.6134.8126.2 M222.5303.0271.2249.9313.6281.8365.1313.6166.7156.0 M243.0353.0315.9291.2365.4328.3425.4365.4194.2181.8 M273.0459.0411.0378.7475.1426.9553.4475.1252.5236.4 M303.5561.0502.1462.8580.6521.7676.0580.6308.6288.9 M364.0817.0731.2674.0845.6759.8984.5845.6449.4420.8 Marking of nut: Grades and categories Hot-forged or cold-stamped nuts Nuts machined from bar stock Nuts manufactured in accordance with §5.7 L 7B L 7MA 7M 7MB 8 8 8B 8A 8C 8C 8CB 8CA 8M 8M 8MB 8MA 8T 8T 8TB 8TA 8F 8F 8FB 8FA 8P 8P 8PB 8PA 8N 8N 8NB 8NA 8MN 8MN 8MNB 8MNA 8R 8R 8RB 8RA 8S 8S 8SB 8SA 8LN8LN8LNB8LNA 8MLN 8MLN 8MLNB 8MLNA 8MLCuN8MLCuN8MLCuNB8MLCuNA 9C 9C 9CB 9CA 161616B