ASTM A325 / ASTM F3125 (Heavy Hex Bolt)
ASME B18.2.6-2019
| Nominal Size or Basic Product Diameter | Body Diameter (E) | Width Across Flats (F) | Width Across Corner (G) | Head Height (H) | Radius of Fillet (R) | Thread Length (LT) | Transition Thread Length (Y) | Maximum Total Runout of Bearing Surface |
| (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Ref) | (Ref) | FIM |
| 1/2" | 0.482 | 0.850 | 0.969 | 0.302 | 0.009 | 1.00 | 0.19 | 0.016 |
| 5/8" | 0.605 | 1.031 | 1.175 | 0.378 | 0.021 | 1.25 | 0.22 | 0.019 |
| 3/4" | 0.729 | 1.212 | 1.383 | 0.455 | 0.021 | 1.38 | 0.25 | 0.022 |
| 7/8' | 0.852 | 1.394 | 1.589 | 0.531 | 0.031 | 1.50 | 0.28 | 0.025 |
| 1" | 0.976 | 1.575 | 1.796 | 0.591 | 0.062 | 1.75 | 0.31 | 0.028 |
| 1-1/8" | 1.098 | 1.756 | 2.002 | 0.658 | 0.062 | 2.00 | 0.34 | 0.032 |
| 1-1/4" | 1.223 | 1.938 | 2.209 | 0.749 | 0.062 | 2.00 | 0.38 | 0.035 |
| 1-3/8" | 1.345 | 2.119 | 2.416 | 0.810 | 0.062 | 2.25 | 0.44 | 0.038 |
| 1-1/2" | 1.470 | 2.300 | 2.622 | 0.902 | 0.062 | 2.25 | 0.44 | 0.041 |
| Nominal Bolt Length Tolerance | ||
| Nominal Bolt Size | Through 6 | Over 6 |
| 1/2" | -0.12 | -0.19 |
| 5/8" | -0.12 | -0.25 |
| 3/4" through 1" | -0.19 | -0.25 |
| 1 - 1/8" through 1 - 1/2" | -0.25 | -0.25 |
| Maximum Grip Gaging Lengths and Minimum Body Lengths for Structural Bolts | |||||||||
| Nominal Diameter and Thread Pitch | |||||||||
| Nominal Length, L | 1/2" - 13TPI | 5/8" - 11TPI | 3/4" - 10TPI | 7/8" - 9TPI | 1" – 8TPI | 1 - 1/8" - 7TPI | 1 - 1/4" - 7TPI | 1 - 3/8" - 6TPI | 1 - 1/2" - 6TPI |
| (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | |
| 1 - 1/4" | - | - | - | - | - | - | - | - | - |
| 1 - 1/2" | 0.31 | - | - | - | - | - | - | - | - |
| 1 - 3/4" | 0.56 | 0.28 | - | - | - | - | - | - | - |
| 2" | 0.81 | 0.53 | 0.37 | - | - | - | - | - | - |
| 2 - 1/4" | 1.06 | 0.78 | 0.62 | 0.47 | - | - | - | - | - |
| 2 - 1/2" | 1.31 | 1.03 | 0.87 | 0.72 | 0.44 | - | - | - | - |
| 2 - 3/4" | 1.56 | 1.28 | 1.12 | 0.97 | 0.69 | - | - | - | - |
| 3" | 1.81 | 1.53 | 1.37 | 1.22 | 0.94 | 0.66 | 0.62 | - | - |
| 3 - 1/4" | 2.06 | 1.78 | 1.62 | 1.47 | 1.19 | 0.91 | 0.87 | - | - |
| 3 - 1/2" | 2.31 | 2.03 | 1.87 | 1.72 | 1.44 | 1.16 | 1.12 | 0.81 | 0.81 |
| 3 - 3/4" | 2.56 | 2.28 | 2.12 | 1.97 | 1.69 | 1.41 | 1.37 | 1.06 | 1.06 |
| 4" | 2.81 | 2.53 | 2.37 | 2.22 | 1.94 | 1.66 | 1.62 | 1.31 | 1.31 |
| 4 - 1/4" | 3.06 | 2.78 | 2.62 | 2.47 | 2.19 | 1.91 | 1.87 | 1.56 | 1.56 |
| 4 - 1/2" | 3.31 | 3.03 | 2.87 | 2.72 | 2.44 | 2.16 | 2.12 | 1.81 | 1.81 |
| 4 - 3/4" | 3.56 | 3.28 | 3.12 | 2.97 | 2.69 | 2.41 | 2.37 | 2.06 | 2.06 |
| 5" | 3.81 | 3.53 | 3.37 | 3.22 | 2.94 | 2.66 | 2.62 | 2.31 | 2.31 |
| 5 - 1/4" | 4.06 | 3.78 | 3.62 | 3.47 | 3.19 | 2.91 | 2.87 | 2.56 | 2.56 |
| 5 - 1/2" | 4.31 | 4.03 | 3.87 | 3.72 | 3.44 | 3.16 | 3.12 | 2.81 | 2.81 |
| 5 - 3/4" | 4.56 | 4.28 | 4.12 | 3.97 | 3.69 | 3.41 | 3.37 | 3.06 | 3.06 |
| 6" | 4.81 | 4.53 | 4.37 | 4.22 | 3.94 | 3.66 | 3.62 | 3.31 | 3.31 |
| 6 - 1/4" | 5.06 | 4.78 | 4.62 | 4.47 | 4.19 | 3.91 | 3.87 | 3.56 | 3.56 |
| 6 - 1/2" | 5.31 | 5.03 | 4.87 | 4.72 | 4.44 | 4.16 | 4.12 | 3.81 | 3.81 |
| 6 - 3/4" | 5.56 | 5.28 | 5.12 | 4.97 | 4.69 | 4.41 | 4.37 | 4.06 | 4.06 |
| 7" | 5.81 | 5.53 | 5.37 | 5.22 | 4.94 | 4.66 | 4.62 | 4.31 | 4.31 |
| 7 - 1/4" | 6.06 | 5.78 | 5.62 | 5.47 | 5.19 | 4.91 | 4.87 | 4.56 | 4.56 |
| 7 - 1/2" | 6.31 | 6.03 | 5.87 | 5.72 | 5.44 | 5.16 | 5.12 | 4.81 | 4.81 |
| 7 - 3/4" | 6.56 | 6.28 | 6.12 | 5.97 | 5.69 | 5.41 | 5.37 | 5.06 | 5.06 |
| 8" | 6.81 | 6.53 | 6.37 | 6.22 | 5.94 | 5.66 | 5.62 | 5.31 | 5.31 |
| 8 - 1/4" | 7.06 | 6.78 | 6.62 | 6.47 | 6.19 | 5.91 | 5.87 | 5.56 | 5.56 |
| 8 - 1/2" | 7.31 | 7.03 | 6.87 | 6.72 | 6.44 | 6.16 | 6.12 | 5.81 | 5.81 |
| 8 - 3/4" | 7.56 | 7.28 | 7.12 | 6.97 | 6.69 | 6.41 | 6.37 | 6.06 | 6.06 |
| 9" | 7.81 | 7.53 | 7.37 | 7.22 | 6.94 | 6.66 | 6.62 | 6.31 | 6.31 |
| 9 - 1/4" | 8.06 | 7.78 | 7.62 | 7.47 | 7.19 | 6.91 | 6.87 | 6.56 | 6.56 |
| 9 - 1/2" | 8.31 | 8.03 | 7.87 | 7.72 | 7.44 | 7.16 | 7.12 | 6.81 | 6.81 |
| 9 - 3/4" | 8.56 | 8.28 | 8.12 | 7.97 | 7.69 | 7.41 | 7.37 | 7.06 | 7.06 |
| 10" | 8.81 | 8.53 | 8.37 | 8.22 | 7.94 | 7.66 | 7.62 | 7.31 | 7.31 |
| Chemical Requirements | ||||||
| Heat Analysis | 120 ksi/830 MPa Minimum | 150 ksi/1040 MPa Minimum | ||||
| Grade A325, A325M, F1852 | Grade A490, A490M, F2280 | |||||
| Type 1 | Type 3 | Type 1 | Type 3 | |||
| Carbon or Alloy Steel with or without Boron | Composition A | Composition B | Based on Corrosion Index | Alloy Steel with or without Boron | Based on Corrosion Index | |
| Carbon | 0.30 - 0.52 | 0.33 - 0.40 | 0.38 -0.48 | 0.30 - 0.52 max | 0.30 - 0.48C | 0.30 - 0.53 |
| Manganese | 0.60 min | 0.90 - 1.20 | 0.70 - 0.90 | 0.60 min | 0.60 min | 0.60 min |
| Phosphorus, max | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 |
| Sulfur, max | 0.040 | 0.040 | 0.040 | 0.040 | 0.040 | 0.040 |
| Silicon | 0.15 - 0.30 | 0.15 - .30 | 0.30 - 0.50 | D | D | D |
| Boron | 0.003 max | D | D | D | 0.003 max | D |
| Copper | D | 0.25 - 0.45 | 0.20 - 0.40 | 0.20 - 0.60 | D | 0.20 - 0.60 |
| Nickel | D | 0.25 - 0.45 | 0.50 - 0.80 | 0.20E min | D | 0.20E min |
| Chromium | D | 0.45 - 0.65 | 0.50 - 0.75 | 0.45 min | D | 0.45 min |
| Vanadium | D | D | D | D | D | D |
| Molybdenum | D | D | 0.06 max | 0.10E min | D | 0.10E min |
| Titanium | D | D | D | D | D | D |
| Number of Tests and Test Method or Criteria | |||
| Sample Size (Per Lot) | Test Method Inch | Test Method Metric | |
| All grades, types, styles Tensile Strength | F1470 | F606/F606M | F606/F606M |
| Proof Load | F1470 | F606/F606M | F606/F606M |
| Hardness | F1470 | F606/F606M | F606/F606M |
| Dimensions and Thread Fit | ASME B18.18 | ASME B18.18 | ASME B18.18 |
| Surface Discontinuities | F1470 | F788 | F788 |
| Coating Weight/Thickness | F1470A | Product Specification | Product Specification |
| 150 ksi grades all types and styles | |||
| Magnetic Particle | F1470 | F788 | F788 |
| Carburization/Decarburization | At least 1 | F2328 | F2328M |
| All Twist Off assemblies | |||
| Assembly Tension Test (Fastener Tension) | F1470 | This standard | |
| Rotational Capacity | F1470 | Annex A2 | Annex A2 |
| Mechanical Property Requirements for Bolts Tested Full Size | ||||||||
| 120 ksi - A325, F1852 | ||||||||
| Stress AreaA | Tensile Load (Min) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||
| in. | in2 | lbf | N | lbf | N | lbf | N | |
| 1/2" - 13TPI UNC | 0.142 | 17,050 | 75,842.18 | 12,050 | 53,601.07 | 13,050 | 58,049.29 | |
| 5/8" - 11TPI UNC | 0.226 | 27,100 | 120,546.81 | 19,200 | 85,405.86 | 20,800 | 92,523.01 | |
| 3/4" - 10TPI UNC | 0.334 | 40,100 | 178,373.69 | 28,400 | 126,329.49 | 30,700 | 136,560.4 | |
| 7/8" - 9TPI UNC | 0.462 | 55,450 | 246,653.89 | 39,250 | 174,592.7 | 42,500 | 189,049.42 | |
| 1" - 8TPI UNC | 0.606 | 72,700 | 323,385.71 | 51,500 | 229,083.41 | 55,750 | 247,988.35 | |
| 1 - 1/8" - 7TPI UNC | 0.763 | 91,600B | 407,457.1 | 64,900B | 288,689.58 | 70,250B | 312,487.57 | |
| 1 - 1/4" - 7TPI UNC | 0.969 | 116,300B | 517,328.17 | 82,400B | 366,533.46 | 89,200B | 396,781.37 | |
| 1 - 3/8" - 6TPI UNC | 1.155 | 138,600B | 616,523.51 | 98,200B | 436,815.36 | 106,300B | 472,845.96 | |
| 1 - 1/2" - 6TPI UNC | 1.405 | 168,600B | 749,970.16 | 119,500B | 531,562.48 | 129,300B | 575,155.05 | |
| Above values based on | 120 ksi | 85 ksi | 92 ksi | |||||
| 150 ksi - A490, F2280 | ||||||||
| Tensile Load (Min) | Tensile Load (Max) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||
| in. | lbf | N | lbf | N | lbf | N | lbf | N |
| 1/2" - 13TPI UNC | 21,300 | 94,747.12 | 24,600 | 109,426.25 | 17,050 | 75,842.178 | 18,500 | 82,292.1 |
| 5/8" - 11TPI UNC | 33,900 | 150,794.71 | 39,100 | 173,925.46 | 27,100 | 120,546.81 | 29,400 | 130,777.72 |
| 3/4" - 10TPI UNC | 50,100 | 222,855.9 | 57,800 | 257,107.21 | 40,100 | 178,373.69 | 43,400 | 193,052.82 |
| 7/8" - 9TPI UNC | 69,300 | 308,261.76 | 79,950 | 355,635.32 | 55,450 | 246,653.89 | 60,100 | 267,338.12 |
| 1" - 8TPI UNC | 90,900 | 404,343.34 | 104,850 | 466,396.035 | 72,700 | 323,385.71 | 78,800 | 350,519.86 |
| 1 - 1/8" - 7TPI UNC | 114,450 | 509,098.962 | 132,000 | 587,165.251 | 91,550 | 407,234.69 | 99,200 | 441,263.58 |
| 1 - 1/4" - 7TPI UNC | 145,350 | 646,549.01 | 167,650 | 745,744.351 | 116,300 | 517,328.172 | 126,000 | 560,475.92 |
| 1 - 3/8" - 6TPI UNC | 173,250 | 770,654.392 | 199,850 | 888,977.087 | 138,600 | 616,523.514 | 150,200 | 668,122.88 |
| 1 - 1/2" - 6TPI UNC | 210,750 | 937,462.702 | 243,100 | 1,081,362.67 | 168,600 | 749,970.162 | 182,600 | 812,245.26 |
| Above values based on | 150 ksi | 173 ksi | 120 ksi | 130 ksi | ||||
| Mechanical Property Requirements for Bolts Tested Full Size | ||||||||||||||||||
| 830 MPa - A325M | 1040 MPa - A490M | |||||||||||||||||
| Stress AreaA | Tensile (Min) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | Tensile min | Tensile max. | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||||||||
| mm | mm2 | kN | kN | kN | kN | kN | kN | kN | ||||||||||
| M12 x 1.75 MC | 84.3 | 70 | 50.6 | 55.6 | 87.7 | 103 | 70 | 79.2 | ||||||||||
| M16 x 2.0 MC | 157 | 130 | 94.2 | 104 | 163 | 190 | 130 | 148 | ||||||||||
| M20 x 2.5 MC | 245 | 203 | 147 | 162 | 255 | 296 | 203 | 230 | ||||||||||
| M22 x 2.5 MC | 303 | 251 | 182 | 200 | 315 | 366 | 251 | 285 | ||||||||||
| M24 x 3.0 MC | 353 | 293 | 212 | 233 | 367 | 427 | 293 | 332 | ||||||||||
| M27 x 3.0 MC | 459 | 381 | 275 | 303 | 477 | 555 | 381 | 431 | ||||||||||
| M30 x 3.5 MC | 561 | 466 | 337 | 370 | 583 | 679 | 466 | 527 | ||||||||||
| M36 x 4.0 MC | 817 | 678 | 490 | 539 | 850 | 989 | 678 | 768 | ||||||||||
| Above values based on | 830 Mpa | 600 Mpa | 660 Mpa | 1040 Mpa | 1210 Mpa | 830Mpa | 940Mpa | |||||||||||