{
 "title": "Bolt torque values for metric and SAE bolts",
 "publisher": "MachinistCharts",
 "source": "https://machinistcharts.com/",
 "updated": "2026-10-05",
 "license": "CC BY 4.0, attribution: MachinistCharts (machinistcharts.com)",
 "method": "T = K x F x d. F (target clamp load) = 75 % of proof load. Proof load = proof stress x tensile stress area. Proof stress: ISO 898-1 (8.8: 580 MPa up to M16, 600 MPa above; 10.9: 830 MPa; 12.9: 970 MPa), SAE J429 (grade 2: 55 ksi to 3/4 in, 33 ksi above; grade 5: 85 ksi to 1 in; grade 8: 120 ksi). Stress area: metric As = pi/4 x (d - 0.9382 p)^2; inch As = 0.7854 x (D - 0.9743/n)^2. K = 0.20 dry, 0.15 lubricated.",
 "standards": [
  "ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel",
  "SAE J429, Mechanical and material requirements for externally threaded fasteners",
  "ASME B1.1, Unified inch screw threads (UN and UNR thread form)",
  "ISO 724, ISO general-purpose metric screw threads, basic dimensions"
 ],
 "note": "General reference values for steel fasteners. Follow the manufacturer's specification when one exists.",
 "rows": [
  {
   "system": "metric",
   "size": "M4",
   "thread": "M4x0.7",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 8.78,
   "proof_load_kN": 5.09,
   "clamp_load_kN": 3.82,
   "torque_dry_Nm": 3.1,
   "torque_dry_ftlb": 2.3,
   "torque_lubricated_Nm": 2.3,
   "torque_lubricated_ftlb": 1.7,
   "wrench": "7 mm",
   "url": "https://machinistcharts.com/bolt-torque/m4/"
  },
  {
   "system": "metric",
   "size": "M4",
   "thread": "M4x0.7",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 8.78,
   "proof_load_kN": 7.29,
   "clamp_load_kN": 5.46,
   "torque_dry_Nm": 4.4,
   "torque_dry_ftlb": 3.2,
   "torque_lubricated_Nm": 3.3,
   "torque_lubricated_ftlb": 2.4,
   "wrench": "7 mm",
   "url": "https://machinistcharts.com/bolt-torque/m4/"
  },
  {
   "system": "metric",
   "size": "M4",
   "thread": "M4x0.7",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 8.78,
   "proof_load_kN": 8.52,
   "clamp_load_kN": 6.39,
   "torque_dry_Nm": 5.1,
   "torque_dry_ftlb": 3.8,
   "torque_lubricated_Nm": 3.8,
   "torque_lubricated_ftlb": 2.8,
   "wrench": "7 mm",
   "url": "https://machinistcharts.com/bolt-torque/m4/"
  },
  {
   "system": "metric",
   "size": "M5",
   "thread": "M5x0.8",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 14.18,
   "proof_load_kN": 8.23,
   "clamp_load_kN": 6.17,
   "torque_dry_Nm": 6.2,
   "torque_dry_ftlb": 4.6,
   "torque_lubricated_Nm": 4.6,
   "torque_lubricated_ftlb": 3.4,
   "wrench": "8 mm",
   "url": "https://machinistcharts.com/bolt-torque/m5/"
  },
  {
   "system": "metric",
   "size": "M5",
   "thread": "M5x0.8",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 14.18,
   "proof_load_kN": 11.77,
   "clamp_load_kN": 8.83,
   "torque_dry_Nm": 8.8,
   "torque_dry_ftlb": 6.5,
   "torque_lubricated_Nm": 6.6,
   "torque_lubricated_ftlb": 4.9,
   "wrench": "8 mm",
   "url": "https://machinistcharts.com/bolt-torque/m5/"
  },
  {
   "system": "metric",
   "size": "M5",
   "thread": "M5x0.8",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 14.18,
   "proof_load_kN": 13.76,
   "clamp_load_kN": 10.32,
   "torque_dry_Nm": 10.3,
   "torque_dry_ftlb": 7.6,
   "torque_lubricated_Nm": 7.7,
   "torque_lubricated_ftlb": 5.7,
   "wrench": "8 mm",
   "url": "https://machinistcharts.com/bolt-torque/m5/"
  },
  {
   "system": "metric",
   "size": "M6",
   "thread": "M6x1",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 20.12,
   "proof_load_kN": 11.67,
   "clamp_load_kN": 8.75,
   "torque_dry_Nm": 10.5,
   "torque_dry_ftlb": 7.7,
   "torque_lubricated_Nm": 7.9,
   "torque_lubricated_ftlb": 5.8,
   "wrench": "10 mm",
   "url": "https://machinistcharts.com/bolt-torque/m6/"
  },
  {
   "system": "metric",
   "size": "M6",
   "thread": "M6x1",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 20.12,
   "proof_load_kN": 16.7,
   "clamp_load_kN": 12.53,
   "torque_dry_Nm": 15.0,
   "torque_dry_ftlb": 11.1,
   "torque_lubricated_Nm": 11.3,
   "torque_lubricated_ftlb": 8.3,
   "wrench": "10 mm",
   "url": "https://machinistcharts.com/bolt-torque/m6/"
  },
  {
   "system": "metric",
   "size": "M6",
   "thread": "M6x1",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 20.12,
   "proof_load_kN": 19.52,
   "clamp_load_kN": 14.64,
   "torque_dry_Nm": 17.6,
   "torque_dry_ftlb": 13.0,
   "torque_lubricated_Nm": 13.2,
   "torque_lubricated_ftlb": 9.7,
   "wrench": "10 mm",
   "url": "https://machinistcharts.com/bolt-torque/m6/"
  },
  {
   "system": "metric",
   "size": "M8",
   "thread": "M8x1.25",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 36.61,
   "proof_load_kN": 21.23,
   "clamp_load_kN": 15.92,
   "torque_dry_Nm": 25.5,
   "torque_dry_ftlb": 18.8,
   "torque_lubricated_Nm": 19.1,
   "torque_lubricated_ftlb": 14.1,
   "wrench": "13 mm",
   "url": "https://machinistcharts.com/bolt-torque/m8/"
  },
  {
   "system": "metric",
   "size": "M8",
   "thread": "M8x1.25",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 36.61,
   "proof_load_kN": 30.39,
   "clamp_load_kN": 22.79,
   "torque_dry_Nm": 36.5,
   "torque_dry_ftlb": 26.9,
   "torque_lubricated_Nm": 27.3,
   "torque_lubricated_ftlb": 20.2,
   "wrench": "13 mm",
   "url": "https://machinistcharts.com/bolt-torque/m8/"
  },
  {
   "system": "metric",
   "size": "M8",
   "thread": "M8x1.25",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 36.61,
   "proof_load_kN": 35.51,
   "clamp_load_kN": 26.63,
   "torque_dry_Nm": 42.6,
   "torque_dry_ftlb": 31.4,
   "torque_lubricated_Nm": 32.0,
   "torque_lubricated_ftlb": 23.6,
   "wrench": "13 mm",
   "url": "https://machinistcharts.com/bolt-torque/m8/"
  },
  {
   "system": "metric",
   "size": "M10",
   "thread": "M10x1.5",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 57.99,
   "proof_load_kN": 33.63,
   "clamp_load_kN": 25.23,
   "torque_dry_Nm": 50.5,
   "torque_dry_ftlb": 37.2,
   "torque_lubricated_Nm": 37.8,
   "torque_lubricated_ftlb": 27.9,
   "wrench": "16 mm",
   "url": "https://machinistcharts.com/bolt-torque/m10/"
  },
  {
   "system": "metric",
   "size": "M10",
   "thread": "M10x1.5",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 57.99,
   "proof_load_kN": 48.13,
   "clamp_load_kN": 36.1,
   "torque_dry_Nm": 72.2,
   "torque_dry_ftlb": 53.2,
   "torque_lubricated_Nm": 54.1,
   "torque_lubricated_ftlb": 39.9,
   "wrench": "16 mm",
   "url": "https://machinistcharts.com/bolt-torque/m10/"
  },
  {
   "system": "metric",
   "size": "M10",
   "thread": "M10x1.5",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 57.99,
   "proof_load_kN": 56.25,
   "clamp_load_kN": 42.19,
   "torque_dry_Nm": 84.4,
   "torque_dry_ftlb": 62.2,
   "torque_lubricated_Nm": 63.3,
   "torque_lubricated_ftlb": 46.7,
   "wrench": "16 mm",
   "url": "https://machinistcharts.com/bolt-torque/m10/"
  },
  {
   "system": "metric",
   "size": "M12",
   "thread": "M12x1.75",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 84.27,
   "proof_load_kN": 48.87,
   "clamp_load_kN": 36.66,
   "torque_dry_Nm": 88.0,
   "torque_dry_ftlb": 64.9,
   "torque_lubricated_Nm": 66.0,
   "torque_lubricated_ftlb": 48.7,
   "wrench": "18 mm",
   "url": "https://machinistcharts.com/bolt-torque/m12/"
  },
  {
   "system": "metric",
   "size": "M12",
   "thread": "M12x1.75",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 84.27,
   "proof_load_kN": 69.94,
   "clamp_load_kN": 52.46,
   "torque_dry_Nm": 125.9,
   "torque_dry_ftlb": 92.9,
   "torque_lubricated_Nm": 94.4,
   "torque_lubricated_ftlb": 69.6,
   "wrench": "18 mm",
   "url": "https://machinistcharts.com/bolt-torque/m12/"
  },
  {
   "system": "metric",
   "size": "M12",
   "thread": "M12x1.75",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 84.27,
   "proof_load_kN": 81.74,
   "clamp_load_kN": 61.3,
   "torque_dry_Nm": 147.1,
   "torque_dry_ftlb": 108.5,
   "torque_lubricated_Nm": 110.3,
   "torque_lubricated_ftlb": 81.4,
   "wrench": "18 mm",
   "url": "https://machinistcharts.com/bolt-torque/m12/"
  },
  {
   "system": "metric",
   "size": "M14",
   "thread": "M14x2",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 115.44,
   "proof_load_kN": 66.95,
   "clamp_load_kN": 50.22,
   "torque_dry_Nm": 140.6,
   "torque_dry_ftlb": 103.7,
   "torque_lubricated_Nm": 105.5,
   "torque_lubricated_ftlb": 77.8,
   "wrench": "21 mm",
   "url": "https://machinistcharts.com/bolt-torque/m14/"
  },
  {
   "system": "metric",
   "size": "M14",
   "thread": "M14x2",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 115.44,
   "proof_load_kN": 95.81,
   "clamp_load_kN": 71.86,
   "torque_dry_Nm": 201.2,
   "torque_dry_ftlb": 148.4,
   "torque_lubricated_Nm": 150.9,
   "torque_lubricated_ftlb": 111.3,
   "wrench": "21 mm",
   "url": "https://machinistcharts.com/bolt-torque/m14/"
  },
  {
   "system": "metric",
   "size": "M14",
   "thread": "M14x2",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 115.44,
   "proof_load_kN": 111.98,
   "clamp_load_kN": 83.98,
   "torque_dry_Nm": 235.1,
   "torque_dry_ftlb": 173.4,
   "torque_lubricated_Nm": 176.4,
   "torque_lubricated_ftlb": 130.1,
   "wrench": "21 mm",
   "url": "https://machinistcharts.com/bolt-torque/m14/"
  },
  {
   "system": "metric",
   "size": "M16",
   "thread": "M16x2",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "580 MPa",
   "stress_area_mm2": 156.67,
   "proof_load_kN": 90.87,
   "clamp_load_kN": 68.15,
   "torque_dry_Nm": 218.1,
   "torque_dry_ftlb": 160.8,
   "torque_lubricated_Nm": 163.6,
   "torque_lubricated_ftlb": 120.6,
   "wrench": "24 mm",
   "url": "https://machinistcharts.com/bolt-torque/m16/"
  },
  {
   "system": "metric",
   "size": "M16",
   "thread": "M16x2",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 156.67,
   "proof_load_kN": 130.03,
   "clamp_load_kN": 97.53,
   "torque_dry_Nm": 312.1,
   "torque_dry_ftlb": 230.2,
   "torque_lubricated_Nm": 234.1,
   "torque_lubricated_ftlb": 172.6,
   "wrench": "24 mm",
   "url": "https://machinistcharts.com/bolt-torque/m16/"
  },
  {
   "system": "metric",
   "size": "M16",
   "thread": "M16x2",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 156.67,
   "proof_load_kN": 151.97,
   "clamp_load_kN": 113.98,
   "torque_dry_Nm": 364.7,
   "torque_dry_ftlb": 269.0,
   "torque_lubricated_Nm": 273.5,
   "torque_lubricated_ftlb": 201.8,
   "wrench": "24 mm",
   "url": "https://machinistcharts.com/bolt-torque/m16/"
  },
  {
   "system": "metric",
   "size": "M18",
   "thread": "M18x2.5",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "600 MPa",
   "stress_area_mm2": 192.47,
   "proof_load_kN": 115.48,
   "clamp_load_kN": 86.61,
   "torque_dry_Nm": 311.8,
   "torque_dry_ftlb": 230.0,
   "torque_lubricated_Nm": 233.9,
   "torque_lubricated_ftlb": 172.5,
   "wrench": "27 mm",
   "url": "https://machinistcharts.com/bolt-torque/m18/"
  },
  {
   "system": "metric",
   "size": "M18",
   "thread": "M18x2.5",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 192.47,
   "proof_load_kN": 159.75,
   "clamp_load_kN": 119.81,
   "torque_dry_Nm": 431.3,
   "torque_dry_ftlb": 318.1,
   "torque_lubricated_Nm": 323.5,
   "torque_lubricated_ftlb": 238.6,
   "wrench": "27 mm",
   "url": "https://machinistcharts.com/bolt-torque/m18/"
  },
  {
   "system": "metric",
   "size": "M18",
   "thread": "M18x2.5",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 192.47,
   "proof_load_kN": 186.7,
   "clamp_load_kN": 140.02,
   "torque_dry_Nm": 504.1,
   "torque_dry_ftlb": 371.8,
   "torque_lubricated_Nm": 378.1,
   "torque_lubricated_ftlb": 278.8,
   "wrench": "27 mm",
   "url": "https://machinistcharts.com/bolt-torque/m18/"
  },
  {
   "system": "metric",
   "size": "M20",
   "thread": "M20x2.5",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "600 MPa",
   "stress_area_mm2": 244.79,
   "proof_load_kN": 146.88,
   "clamp_load_kN": 110.16,
   "torque_dry_Nm": 440.6,
   "torque_dry_ftlb": 325.0,
   "torque_lubricated_Nm": 330.5,
   "torque_lubricated_ftlb": 243.7,
   "wrench": "30 mm",
   "url": "https://machinistcharts.com/bolt-torque/m20/"
  },
  {
   "system": "metric",
   "size": "M20",
   "thread": "M20x2.5",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 244.79,
   "proof_load_kN": 203.18,
   "clamp_load_kN": 152.38,
   "torque_dry_Nm": 609.5,
   "torque_dry_ftlb": 449.6,
   "torque_lubricated_Nm": 457.2,
   "torque_lubricated_ftlb": 337.2,
   "wrench": "30 mm",
   "url": "https://machinistcharts.com/bolt-torque/m20/"
  },
  {
   "system": "metric",
   "size": "M20",
   "thread": "M20x2.5",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 244.79,
   "proof_load_kN": 237.45,
   "clamp_load_kN": 178.09,
   "torque_dry_Nm": 712.4,
   "torque_dry_ftlb": 525.4,
   "torque_lubricated_Nm": 534.3,
   "torque_lubricated_ftlb": 394.1,
   "wrench": "30 mm",
   "url": "https://machinistcharts.com/bolt-torque/m20/"
  },
  {
   "system": "metric",
   "size": "M22",
   "thread": "M22x2.5",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "600 MPa",
   "stress_area_mm2": 303.4,
   "proof_load_kN": 182.04,
   "clamp_load_kN": 136.53,
   "torque_dry_Nm": 600.7,
   "torque_dry_ftlb": 443.1,
   "torque_lubricated_Nm": 450.5,
   "torque_lubricated_ftlb": 332.3,
   "wrench": "34 mm",
   "url": "https://machinistcharts.com/bolt-torque/m22/"
  },
  {
   "system": "metric",
   "size": "M22",
   "thread": "M22x2.5",
   "series": "coarse",
   "grade": "class 10.9",
   "proof_stress": "830 MPa",
   "stress_area_mm2": 303.4,
   "proof_load_kN": 251.82,
   "clamp_load_kN": 188.87,
   "torque_dry_Nm": 831.0,
   "torque_dry_ftlb": 612.9,
   "torque_lubricated_Nm": 623.3,
   "torque_lubricated_ftlb": 459.7,
   "wrench": "34 mm",
   "url": "https://machinistcharts.com/bolt-torque/m22/"
  },
  {
   "system": "metric",
   "size": "M22",
   "thread": "M22x2.5",
   "series": "coarse",
   "grade": "class 12.9",
   "proof_stress": "970 MPa",
   "stress_area_mm2": 303.4,
   "proof_load_kN": 294.3,
   "clamp_load_kN": 220.72,
   "torque_dry_Nm": 971.2,
   "torque_dry_ftlb": 716.3,
   "torque_lubricated_Nm": 728.4,
   "torque_lubricated_ftlb": 537.2,
   "wrench": "34 mm",
   "url": "https://machinistcharts.com/bolt-torque/m22/"
  },
  {
   "system": "metric",
   "size": "M24",
   "thread": "M24x3",
   "series": "coarse",
   "grade": "class 8.8",
   "proof_stress": "600 MPa",
   "stress_area_mm2": 352.5,
   "proof_load_kN": 211.5,
   "clamp_load_kN": 158.63,
   "torque_dry_Nm": 761.4,
   "torque_dry_ftlb": 561.6,
   "torque_lubricated_Nm": 571.1,
   "torque_lubricated_ftlb": 421.2,
   "wrench": "36 mm",
   "url": "https://machinistcharts.com/bolt-torque/m24/"
  },
  {
   "system": "metric",
   "size": "M24",
   "thread": "M24x3",
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   "torque_lubricated_ftlb": 681.5,
   "wrench": "1-1/2 in",
   "url": "https://machinistcharts.com/bolt-torque/1-inch/"
  },
  {
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   "torque_dry_ftlb": 273.5,
   "torque_lubricated_Nm": 278.1,
   "torque_lubricated_ftlb": 205.1,
   "wrench": "1-1/2 in",
   "url": "https://machinistcharts.com/bolt-torque/1-inch/"
  },
  {
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   "proof_load_lbf": 56359,
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   "torque_lubricated_Nm": 716.4,
   "torque_lubricated_ftlb": 528.4,
   "wrench": "1-1/2 in",
   "url": "https://machinistcharts.com/bolt-torque/1-inch/"
  },
  {
   "system": "inch",
   "size": "1",
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   "torque_lubricated_Nm": 1011.3,
   "torque_lubricated_ftlb": 745.9,
   "wrench": "1-1/2 in",
   "url": "https://machinistcharts.com/bolt-torque/1-inch/"
  }
 ]
}