Standard bolts

1. List of standard bolt and nut tightening torques

1. Standard bolts and nuts for which no tightening torques are specified

Strength category
 4.8
4T
 7T
Bolt head shape
 Hex bolt
 Flange bolt
 Hex bolt
 Flange bolt
M6 x 1
 3.9 to 7.8 N・m { 0.4 to 0.8 kgf・m / 34.5 to 69.0 lb・in }
 4.6 to 8.5 N・m { 0.5 to 0.9 kgf・m / 40.7 to 75.2 lb・in }
 4.9 to 9.8 N・m { 0.5 to 1.0 kgf・m / 43.4 to 86.7 lb・in }
 5.7 to 10.6 N・m { 0.6 to 1.1 kgf・m / 50.4 to 93.8 lb・in }
M8 x 1.25
 9.1 to 17.7 N・m { 0.9 to 1.8 kgf・m / 6.7 to 13.1 lb・ft }
 10.5 to 19.6 N・m { 1.1 to 2.0 kgf・m / 7.7 to 14.5 lb・ft }
 11.8 to 23.5 N・m { 1.2 to 2.4 kgf・m / 8.7 to 17.3 lb・ft }
 14.0 to 26.0 N・m { 1.4 to 2.7 kgf・m / 10.3 to 19.2 lb・ft }
M10 x 1.25
 20.6 to 34.3 N・m { 2.1 to 3.5 kgf・m / 15.2 to 25.3 lb・ft }
 23.1 to 38.5 N・m { 2.4 to 3.9 kgf・m / 17.0 to 28.4 lb・ft }
 27.5 to 46.1 N・m { 2.8 to 4.7 kgf・m / 20.3 to 34.0 lb・ft }
 31.0 to 51.7 N・m { 3.2 to 5.3 kgf・m / 22.9 to 38.1 lb・ft }
*M10 x 1.5
 19.6 to 33.3 N・m { 2.0 to 3.4 kgf・m / 14.5 to 24.6 lb・ft }
 22.3 to 37.2 N・m { 2.3 to 3.8 kgf・m / 16.4 to 27.4 lb・ft }
 27.5 to 45.1 N・m { 2.8 to 4.6 kgf・m / 20.3 to 33.3 lb・ft }
 30.3 to 50.4 N・m { 3.1 to 5.1 kgf・m / 22.3 to 37.2 lb・ft }
M12 x 1.25
 49.0 to 73.5 N・m { 5.0 to 7.5 kgf・m / 36.1 to 54.2 lb・ft }
 54.9 to 82.3 N・m { 5.6 to 8.4 kgf・m / 40.5 to 60.7 lb・ft }
 60.8 to 91.2 N・m { 6.2 to 9.3 kgf・m / 44.8 to 67.3 lb・ft }
 68.1 to 102.0 N・m { 6.9 to 10.4 kgf・m / 50.2 to 75.2 lb・ft }
*M12 x 1.75
 45.1 to 68.6 N・m { 4.6 to 7.0 kgf・m / 33.3 to 50.6 lb・ft }
 51.0 to 76.5 N・m { 5.2 to 7.8 kgf・m / 37.6 to 56.4 lb・ft }
 56.9 to 84.3 N・m { 5.8 to 8.6 kgf・m / 42.0 to 62.2 lb・ft }
 62.7 to 94.0 N・m { 6.4 to 9.6 kgf・m / 46.2 to 69.3 lb・ft }
M14 x 1.5
 76.5 to 115.0 N・m { 7.8 to 11.7 kgf・m / 56.4 to 84.8 lb・ft }
 83.0 to 125.0 N・m { 8.5 to 12.7 kgf・m / 61.2 to 92.2 lb・ft }
 93.0 to 139.0 N・m { 9.5 to 14.2 kgf・m / 68.6 to 102.5 lb・ft }
 101.0 to 151.0 N・m { 10.3 to 15.4 kgf・m / 74.5 to 111.4 lb・ft }
*M14 x 2
 71.6 to 107.0 N・m { 7.3 to 10.9 kgf・m / 52.8 to 78.9 lb・ft }
 77.2 to 116.0 N・m { 7.9 to 11.8 kgf・m / 56.9 to 85.6 lb・ft }
 88.3 to 131.0 N・m { 9.0 to 13.4 kgf・m / 65.1 to 96.6 lb・ft }
 94.9 to 142.0 N・m { 9.7 to 14.5 kgf・m / 70.0 to 104.7 lb・ft }
M16 x 1.5
 104.0 to 157.0 N・m { 10.6 to 16.0 kgf・m / 76.7 to 115.8 lb・ft }
 116.0 to 173.0 N・m { 11.8 to 17.6 kgf・m / 85.6 to 127.6 lb・ft }
 135.0 to 204.0 N・m { 13.8 to 20.8 kgf・m / 99.6 to 150.5 lb・ft }
 150.0 to 225.0 N・m { 15.3 to 22.9 kgf・m / 110.6 to 166.0 lb・ft }
*M16 x 2
 100.0 to 149.0 N・m { 10.2 to 15.2 kgf・m / 73.8 to 109.9 lb・ft }
 109.0 to 164.0 N・m { 11.1 to 16.7 kgf・m / 80.4 to 121.0 lb・ft }
 129.0 to 194.0 N・m { 13.2 to 19.8 kgf・m / 95.1 to 143.1 lb・ft }
 143.0 to 214.0 N・m { 14.6 to 21.8 kgf・m / 105.5 to 157.8 lb・ft }
M18 x 1.5
 159.0 to 239.0 N・m { 16.2 to 24.4 kgf・m / 117.3 to 176.3 lb・ft }
 -
 216.0 to 324.0 N・m { 22.0 to 33.0 kgf・m / 159.3 to 239.0 lb・ft }
 -
*M18 x 2.5
 151.0 to 226.0 N・m { 15.4 to 23.0 kgf・m / 111.4 to 166.7 lb・ft }
 -
 196.0 to 294.0 N・m { 20.0 to 30.0 kgf・m / 144.6 to 216.8 lb・ft }
 -
M20 x 1.5
 206.0 to 310.0 N・m { 21.0 to 31.6 kgf・m / 151.9 to 228.6 lb・ft }
 -
 270.0 to 405.0 N・m { 27.5 to 41.3 kgf・m / 199.1 to 298.7 lb・ft }
 -
*M20 x 2.5
 190.0 to 286.0 N・m { 19.4 to 29.2 kgf・m / 140.1 to 210.9 lb・ft }
 -
 249.0 to 375.0 N・m { 25.4 to 38.2 kgf・m / 183.7 to 276.6 lb・ft }
 -
M22 x 1.5
 251.0 to 414.0 N・m { 25.6 to 42.2 kgf・m / 185.1 to 305.3 lb・ft }
 -
 363.0 to 544.0 N・m { 37.0 to 55.5 kgf・m / 267.7 to 401.2 lb・ft }
 -
*M22 x 2.5
 218.0 to 328.0 N・m { 22.2 to 33.4 kgf・m / 160.8 to 241.9 lb・ft }
 -
 338.0 to 507.0 N・m { 34.5 to 51.7 kgf・m / 249.3 to 373.9 lb・ft }
 -
M24 x 2
 359.0 to 539.0 N・m { 36.6 to 55.0 kgf・m / 264.8 to 397.5 lb・ft }
 -
 431.0 to 711.0 N・m { 43.9 to 72.5 kgf・m / 317.9 to 524.4 lb・ft }
 -
*M24 x 3
 338.0 to 507.0 N・m { 34.5 to 51.7 kgf・m / 249.3 to 373.9 lb・ft }
 -
 406.0 to 608.0 N・m { 41.4 to 62.0 kgf・m / 299.4 to 448.4 lb・ft }
 -
Strength category
 8.8
 9.8
9T
Bolt head shape
 Hex bolt
 Flange bolt
 Hex bolt
 Flange bolt
M6 x 1
 5.6 to 11.2 N・m { 0.6 to 1.1 kgf・m / 49.6 to 99.1 lb・in }
 6.6 to 12.2 N・m { 0.7 to 1.2 kgf・m / 58.4 to 108.0 lb・in }
 -
 -
M8 x 1.25
 13.4 to 26.8 N・m { 1.4 to 2.7 kgf・m / 9.9 to 19.8 lb・ft }
 15.9 to 29.6 N・m { 1.6 to 3.0 kgf・m / 11.7 to 21.8 lb・ft }
 16.7 to 30.4 N・m { 1.7 to 3.1 kgf・m / 12.3 to 22.4 lb・ft }
 18.1 to 33.6 N・m { 1.8 to 3.4 kgf・m / 13.3 to 24.8 lb・ft }
M10 x 1.25
 31.3 to 52.5 N・m { 3.2 to 5.4 kgf・m / 23.1 to 38.7 lb・ft }
 35.4 to 58.9 N・m { 3.6 to 6.0 kgf・m / 26.1 to 43.4 lb・ft }
 37.3 to 62.8 N・m { 3.8 to 6.4 kgf・m / 27.5 to 46.3 lb・ft }
 42.3 to 70.5 N・m { 4.3 to 7.2 kgf・m / 31.2 to 52.0 lb・ft }
*M10 x 1.5
 31.3 to 51.4 N・m { 3.2 to 5.2 kgf・m / 23.1 to 37.9 lb・ft }
 34.5 to 57.5 N・m { 3.5 to 5.9 kgf・m / 25.4 to 42.4 lb・ft }
 36.3 to 59.8 N・m { 3.7 to 6.1 kgf・m / 26.8 to 44.1 lb・ft }
 40.1 to 66.9 N・m { 4.1 to 6.8 kgf・m / 29.6 to 49.3 lb・ft }
M12 x 1.25
 69.3 to 104.0 N・m { 7.1 to 10.6 kgf・m / 51.1 to 76.7 lb・ft }
 77.7 to 117.0 N・m { 7.9 to 11.9 kgf・m / 57.3 to 86.3 lb・ft }
 75.5 to 114.0 N・m { 7.7 to 11.6 kgf・m / 55.7 to 84.1 lb・ft }
 85.0 to 128.0 N・m { 8.7 to 13.1 kgf・m / 62.7 to 94.4 lb・ft }
*M12 x 1.75
 64.8 to 96.1 N・m { 6.6 to 9.8 kgf・m / 47.8 to 70.9 lb・ft }
 71.4 to 107.0 N・m { 7.3 to 10.9 kgf・m / 52.7 to 78.9 lb・ft }
 71.6 to 107.0 N・m { 7.3 to 10.9 kgf・m / 52.8 to 78.9 lb・ft }
 79.5 to 119.0 N・m { 8.1 to 12.1 kgf・m / 58.6 to 87.8 lb・ft }
M14 x 1.5
 106.0 to 159.0 N・m { 10.8 to 16.2 kgf・m / 78.2 to 117.3 lb・ft }
 115.0 to 172.0 N・m { 11.7 to 17.5 kgf・m / 84.8 to 126.9 lb・ft }
 114.0 to 171.0 N・m { 11.6 to 17.4 kgf・m / 84.1 to 126.1 lb・ft }
 123.0 to 185.0 N・m { 12.5 to 18.9 kgf・m / 90.7 to 136.4 lb・ft }
*M14 x 2
 101.0 to 150.0 N・m { 10.3 to 15.3 kgf・m / 74.5 to 110.6 lb・ft }
 108.0 to 162.0 N・m { 11.0 to 16.5 kgf・m / 79.7 to 119.5 lb・ft }
 107.0 to 160.0 N・m { 10.9 to 16.3 kgf・m / 78.9 to 118.0 lb・ft }
 116.0 to 173.0 N・m { 11.8 to 17.6 kgf・m / 85.6 to 127.6 lb・ft }
M16 x 1.5
 154.0 to 233.0 N・m { 15.7 to 23.8 kgf・m / 113.6 to 171.9 lb・ft }
 171.0 to 257.0 N・m { 17.4 to 26.2 kgf・m / 126.1 to 189.6 lb・ft }
 160.0 to 240.0 N・m { 16.3 to 24.5 kgf・m / 118.0 to 177.0 lb・ft }
 177.0 to 265.0 N・m { 18.0 to 27.0 kgf・m / 130.5 to 195.5 lb・ft }
*M16 x 2
 148.0 to 221.0 N・m { 15.1 to 22.5 kgf・m / 109.2 to 163.0 lb・ft }
 163.0 to 244.0 N・m { 16.6 to 24.9 kgf・m / 120.2 to 180.0 lb・ft }
 153.0 to 230.0 N・m { 15.6 to 23.5 kgf・m / 112.8 to 169.6 lb・ft }
 169.0 to 253.0 N・m { 17.2 to 25.8 kgf・m / 124.6 to 186.6 lb・ft }
M18 x 1.5
 246.0 to 368.0 N・m { 25.1 to 37.5 kgf・m / 181.4 to 271.4 lb・ft }
 -
 254.0 to 380.0 N・m { 25.9 to 38.7 kgf・m / 187.3 to 280.3 lb・ft }
 -
*M18 x 2.5
 224.0 to 335.0 N・m { 22.8 to 34.2 kgf・m / 165.2 to 247.1 lb・ft }
 -
 231.0 to 346.0 N・m { 23.6 to 35.3 kgf・m / 170.4 to 255.2 lb・ft }
 -
M20 x 1.5
 307.0 to 462.0 N・m { 31.3 to 47.1 kgf・m / 226.4 to 340.8 lb・ft }
 -
 317.0 to 476.0 N・m { 32.3 to 48.5 kgf・m / 233.8 to 351.1 lb・ft }
 -
*M20 x 2.5
 284.0 to 427.0 N・m { 29.0 to 43.5 kgf・m / 209.5 to 314.9 lb・ft }
 -
 293.0 to 440.0 N・m { 29.9 to 44.9 kgf・m / 216.1 to 324.5 lb・ft }
 -
M22 x 1.5
 414.0 to 621.0 N・m { 42.2 to 63.3 kgf・m / 305.3 to 458.0 lb・ft }
 -
 425.0 to 637.0 N・m { 43.3 to 65.0 kgf・m / 313.5 to 469.8 lb・ft }
 -
*M22 x 2.5
 386.0 to 578.0 N・m { 39.4 to 58.9 kgf・m / 284.7 to 426.3 lb・ft }
 -
 394.0 to 592.0 N・m { 40.2 to 60.4 kgf・m / 290.6 to 436.6 lb・ft }
 -
M24 x 2
 491.0 to 811.0 N・m { 50.1 to 82.7 kgf・m / 362.1 to 598.2 lb・ft }
 -
 554.0 to 831.0 N・m { 56.5 to 84.7 kgf・m / 408.6 to 612.9 lb・ft }
 -
*M24 x 3
 463.0 to 693.0 N・m { 47.2 to 70.7 kgf・m / 341.5 to 511.1 lb・ft }
 -
 521.0 to 782.0 N・m { 53.1 to 79.7 kgf・m / 384.3 to 576.8 lb・ft }
 -

Note

  • Those indicated with an asterisk (*) are used for the internal threaded portion of soft material such as castings.
  • Refer to the following list for the indicators used on standard bolt heads.

Display on head of standard bolt

Legend

  1. Hex bolt (4.8, 4T)
  2. Hex bolt (4.8, 4T)
  3. Flange bolt (4.8, 4T)
  4. Flange bolt (4.8, 4T)
  5. Hex bolt (7T)
  6. Flange bolt (7T)
  7. Hex bolt (Thermally refined 8.8)
  8. Hex bolt (Thermally refined 8.8)
  9. Hex bolt (Non-thermally refined 8.8)
  10. Hex bolt (Non-thermally refined 8.8)
  11. Flange bolt (8.8)
  12. Flange bolt (8.8)
  13. Hex bolt (9.8, 9T)
  14. Hex bolt (9.8, 9T)
  15. Flange bolt (9.8, 9T)
  16. Flange bolt (9.8, 9T)

2. Tightening torque for flare nuts

A-type flare nut
Pipe diameter
 HEX
 Nominal designation of thread
 Tightening torque
4.76 mm { 0.19 in }
 10 mm
 M10 x 1.0
 13 to 18 N・m { 1.3 to 1.8 kgf・m / 115 to 159 lb・in } Iron
9 to 15 N・m { 0.9 to 1.5 kgf・m / 80 to 133 lb・in } Non-ferrous
6.35 mm { 0.25 in }
 12 mm
 M12 x 1.0
 25 to 35 N・m { 2.5 to 3.6 kgf・m / 18 to 26 lb・ft } Iron
8.0 mm { 0.31 in }
 14 mm
 M14 x 1.5
 29 to 39 N・m { 3.0 to 4.0 kgf・m / 21 to 29 lb・ft } Iron
10.0 mm { 0.39 in }
 17 mm
 M16 x 1.5
 45 to 55 N・m { 4.6 to 5.6 kgf・m / 33 to 41 lb・ft } Iron
C-type flare nut
Pipe diameter
 HEX
 Nominal designation of thread
 Tightening torque*
4.76 mm { 0.19 in }
 14 mm
 M10 x 1.0
 13 to 18 N・m { 1.3 to 1.8 kgf・m / 115 to 159 lb・in } Iron
6.35 mm { 0.25 in }
 17 mm
 M12 x 1.5
 25 to 35 N・m { 2.5 to 3.6 kgf・m / 18 to 26 lb・ft } Iron
19.6 to 23.5 N・m { 2.0 to 2.4 kgf・m / 14 to 17 lb・ft } Non-ferrous
8.0 mm { 0.31 in }
 17 mm
 M14 x 1.5
 25 to 39 N・m { 2.5 to 4.0 kgf・m / 18 to 29 lb・ft } Iron
19.6 to 23.5 N・m { 2.0 to 2.4 kgf・m / 14 to 17 lb・ft } Non-ferrous
10.0 mm { 0.39 in }
 19 mm
 M16 x 1.5
 45 to 80 N・m { 4.6 to 8.2 kgf・m / 33 to 59 lb・ft } Iron
39.2 to 44.1 N・m { 4.0 to 4.5 kgf・m / 29 to 33 lb・ft } Non-ferrous
12.0 mm { 0.47 in }
 24 mm
 M16 x 1.5
 65 to 115 N・m { 6.6 to 11.7 kgf・m / 48 to 85 lb・ft } Iron
49.0 to 58.8 N・m { 5.0 to 6.0 kgf・m / 36 to 43 lb・ft } Non-ferrous
15.0 mm { 0.59 in }
 30 mm
 M22 x 1.5
 80 to 130 N・m { 8.2 to 13.3 kgf・m / 59 to 96 lb・ft } Iron
49.0 to 58.8 N・m { 5.0 to 6.0 kgf・m / 36 to 43 lb・ft } Non-ferrous

Note

  • Asterisks (*) indicate that the tightening torque varies depending on the material of the opposing side. Non-ferrous: Aluminum and brass

3. Tightening torques for PT screws and connectors

Caution

  • Apply a liquid sealing agent equivalent to LOCTITE 575 to the threaded portion and tighten. Do not use seal tape, etc.
  • The tightening torque for connectors (except brass tapered screws) only applies when the mating side is not made of aluminum (however, it does apply for aluminum air tanks, etc.).
  • Completely dry and then let air in after tightening.
PT screw, connector (Brass tapered screw)
Nominal designation of thread
 Tightening torque
PT(R)1/8
 2.0 to 14.7 N・m { 0.2 to 1.5 kgf・m / 18 to 130 lb・in }
PT(R)1/4
 4.9 to 15.7 N・m { 0.5 to 1.6 kgf・m / 43 to 139 lb・in }
PT(R)3/8
 9.8 to 16.7 N・m { 1.0 to 1.7 kgf・m / 87 to 148 lb・in }
PT(R)1/2
 9.8 to 17.7 N・m { 1.0 to 1.8 kgf・m / 87 to 157 lb・in }
PT screw, connector (Except brass tapered screw)
Nominal designation of thread
 Tightening torque
PT(R)1/8
 5.9 to 11.8 N・m { 0.6 to 1.2 kgf・m / 52 to 104 lb・in }
PT(R)1/4
 14.7 to 29.4 N・m { 1.5 to 3.0 kgf・m / 130 to 260 lb・in }
PT(R)3/8
 29.4 to 39.2 N・m { 3.0 to 4.0 kgf・m / 22 to 29 lb・ft }
PT(R)1/2
 29.4 to 58.8 N・m { 3.0 to 6.0 kgf・m / 22 to 43 lb・ft }
PT(R)3/4
 58.8 to 98.0 N・m { 6.0 to 10.0 kgf・m / 43 to 72 lb・ft }
Elbow-type connector
Nominal designation of thread
 Tightening torque
Brass tapered screws
 Except brass tapered screws
PT 1/8
 2.0 N・m { 0.2 kgf・m / 18 lb・in }
 5.9 N・m { 0.6 kgf・m / 52 lb・in }
PT 1/4
 4.9 N・m { 0.5 kgf・m / 43 lb・in }
 14.7 N・m { 1.5 kgf・m / 130 lb・in }
PT 3/8
 9.8 N・m { 1.0 kgf・m / 87 lb・in }
 29.4 N・m { 3.0 kgf・m / 22 lb・ft }
PT 1/2
 9.8 N・m { 1.0 kgf・m / 87 lb・in }
 29.4 N・m { 3.0 kgf・m / 22 lb・ft }
PT 3/4
 -
 58.8 N・m { 6.0 kgf・m / 43 lb・ft }

Caution

  • For elbow-type connectors, tighten to the torque in the above table, and then further tighten until the angle is in the correct position.

Legend

  1. Specified lowest torque position
  2. Correct position
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