ASTM A574 ボルト締付トルク表
ASTM A574のボルト（#1〜2"）の締付トルクと締付軸力です。たとえば1/4" A574のボルトは、乾燥状態で約14.7 ft·lb (20.0 N·m)が必要です。
合金鋼の六角穴付きボルトで、ISO 12.9に相当するインチ規格です。降伏点は150 ksiと仮定しています（規格では引張強さと保証荷重を規定）。
- 規格
- ASTM（インチ）
- 使用した降伏点
- 1034 MPa (150 ksi)
- 引張強さ
- 1241 MPa (180 ksi)
- 対象サイズ
- #1 – 2"
| サイズ | ねじピッチ | 締付軸力軸力 | 乾燥μ 0.15 | 油潤滑μ 0.11 | PTFE・モリブデンペーストμ 0.06 |
|---|---|---|---|---|---|
| #1 | 1-64 UNC64 TPI | 1.22 kN275 lbf | 4.40 in·lb0.50 N·m | 3.34 in·lb0.38 N·m | 2.29 in·lb0.26 N·m |
| #2 | 2-56 UNC56 TPI | 1.73 kN388 lbf | 7.20 in·lb0.81 N·m | 5.47 in·lb0.62 N·m | 3.74 in·lb0.42 N·m |
| #3 | 3-48 UNC48 TPI | 2.27 kN511 lbf | 10.8 in·lb1.22 N·m | 8.24 in·lb0.93 N·m | 5.64 in·lb0.64 N·m |
| #4 | 4-40 UNC40 TPI | 2.82 kN633 lbf | 15.2 in·lb1.72 N·m | 11.6 in·lb1.31 N·m | 8.00 in·lb0.90 N·m |
| #5 | 5-40 UNC40 TPI | 3.71 kN835 lbf | 22.0 in·lb2.49 N·m | 16.7 in·lb1.89 N·m | 11.4 in·lb1.29 N·m |
| #6 | 6-32 UNC32 TPI | 4.24 kN954 lbf | 28.0 in·lb3.16 N·m | 21.4 in·lb2.42 N·m | 14.8 in·lb1.67 N·m |
| #8 | 8-32 UNC32 TPI | 6.54 kN1471 lbf | 50.1 in·lb5.66 N·m | 37.9 in·lb4.29 N·m | 25.8 in·lb2.91 N·m |
| #10 | 10-24 UNC24 TPI | 8.19 kN1840 lbf | 73.3 in·lb8.28 N·m | 56.0 in·lb6.32 N·m | 38.6 in·lb4.36 N·m |
| #12 | 12-24 UNC24 TPI | 11.3 kN2537 lbf | 112.9 in·lb12.8 N·m | 85.7 in·lb9.68 N·m | 58.4 in·lb6.60 N·m |
| 1/4" | 1/4"-20 UNC20 TPI | 14.9 kN3341 lbf | 14.7 ft·lb20.0 N·m | 11.2 ft·lb15.2 N·m | 7.63 ft·lb10.3 N·m |
| 5/16" | 5/16"-18 UNC18 TPI | 24.5 kN5504 lbf | 29.1 ft·lb39.4 N·m | 22.0 ft·lb29.8 N·m | 14.9 ft·lb20.2 N·m |
| 3/8" | 3/8"-16 UNC16 TPI | 36.2 kN8135 lbf | 50.2 ft·lb68.1 N·m | 37.9 ft·lb51.3 N·m | 25.5 ft·lb34.6 N·m |
| 7/16" | 7/16"-14 UNC14 TPI | 49.6 kN11160 lbf | 79.0 ft·lb107.0 N·m | 59.5 ft·lb80.7 N·m | 40.1 ft·lb54.4 N·m |
| 1/2" | 1/2"-13 UNC13 TPI | 66.3 kN14896 lbf | 122.7 ft·lb166.3 N·m | 92.2 ft·lb125.0 N·m | 61.7 ft·lb83.6 N·m |
| 9/16" | 9/16"-12 UNC12 TPI | 85.0 kN19100 lbf | 174.1 ft·lb236.1 N·m | 130.7 ft·lb177.2 N·m | 87.3 ft·lb118.3 N·m |
| 5/8" | 5/8"-11 UNC11 TPI | 105.5 kN23725 lbf | 242.0 ft·lb328.1 N·m | 181.4 ft·lb246.0 N·m | 120.8 ft·lb163.8 N·m |
| 3/4" | 3/4"-10 UNC10 TPI | 156.2 kN35111 lbf | 425.7 ft·lb577.1 N·m | 318.0 ft·lb431.2 N·m | 210.4 ft·lb285.3 N·m |
| 7/8" | 7/8"-9 UNC9 TPI | 215.6 kN48472 lbf | 681.7 ft·lb924.2 N·m | 508.4 ft·lb689.3 N·m | 335.2 ft·lb454.4 N·m |
| 1" | 1"-8 UNC8 TPI | 282.9 kN63590 lbf | 1019.2 ft·lb1381.9 N·m | 759.8 ft·lb1030.1 N·m | 500.3 ft·lb678.4 N·m |
| 1-1/8" | 1-1/8"-7 UNC7 TPI | 356.4 kN80127 lbf | 1444.5 ft·lb1958.4 N·m | 1077.5 ft·lb1460.8 N·m | 710.5 ft·lb963.3 N·m |
| 1-1/4" | 1-1/4"-7 UNC7 TPI | 452.5 kN101735 lbf | 2021.5 ft·lb2740.8 N·m | 1502.3 ft·lb2036.8 N·m | 983.0 ft·lb1332.8 N·m |
| 1-3/8" | 1-3/8"-6 UNC6 TPI | 539.3 kN121237 lbf | 2657.7 ft·lb3603.3 N·m | 1979.2 ft·lb2683.4 N·m | 1300.7 ft·lb1763.5 N·m |
| 1-1/2" | 1-1/2"-6 UNC6 TPI | 656.2 kN147521 lbf | 3505.8 ft·lb4753.2 N·m | 2602.9 ft·lb3529.1 N·m | 1700.1 ft·lb2305.0 N·m |
| 1-3/4" | 1-3/4"-5 UNC5 TPI | 887.0 kN199402 lbf | 5531.8 ft·lb7500.1 N·m | 4111.3 ft·lb5574.2 N·m | 2690.8 ft·lb3648.3 N·m |
| 2" | 2"-4.5 UNC4.5 TPI | 1166.6 kN262259 lbf | 8293.2 ft·lb11244.1 N·m | 6158.0 ft·lb8349.1 N·m | 4022.7 ft·lb5454.0 N·m |
| サイズ | ねじピッチ | 締付軸力軸力 | 乾燥μ 0.15 | 油潤滑μ 0.11 | PTFE・モリブデンペーストμ 0.06 |
|---|---|---|---|---|---|
| #1 | 1-72 UNF72 TPI | 1.30 kN292 lbf | 4.60 in·lb0.52 N·m | 3.48 in·lb0.39 N·m | 2.36 in·lb0.27 N·m |
| #2 | 2-64 UNF64 TPI | 1.84 kN413 lbf | 7.57 in·lb0.85 N·m | 5.71 in·lb0.65 N·m | 3.85 in·lb0.44 N·m |
| #3 | 3-56 UNF56 TPI | 2.44 kN549 lbf | 11.5 in·lb1.30 N·m | 8.66 in·lb0.98 N·m | 5.85 in·lb0.66 N·m |
| #4 | 4-48 UNF48 TPI | 3.08 kN693 lbf | 16.3 in·lb1.85 N·m | 12.4 in·lb1.40 N·m | 8.37 in·lb0.95 N·m |
| #5 | 5-44 UNF44 TPI | 3.88 kN872 lbf | 22.8 in·lb2.57 N·m | 17.2 in·lb1.94 N·m | 11.6 in·lb1.31 N·m |
| #6 | 6-40 UNF40 TPI | 4.74 kN1065 lbf | 30.6 in·lb3.45 N·m | 23.1 in·lb2.61 N·m | 15.6 in·lb1.76 N·m |
| #8 | 8-36 UNF36 TPI | 6.88 kN1546 lbf | 52.1 in·lb5.88 N·m | 39.2 in·lb4.43 N·m | 26.4 in·lb2.98 N·m |
| #10 | 10-32 UNF32 TPI | 9.34 kN2099 lbf | 81.3 in·lb9.19 N·m | 61.2 in·lb6.91 N·m | 41.1 in·lb4.64 N·m |
| #12 | 12-28 UNF28 TPI | 12.0 kN2707 lbf | 118.9 in·lb13.4 N·m | 89.5 in·lb10.1 N·m | 60.1 in·lb6.79 N·m |
| 1/4" | 1/4"-28 UNF28 TPI | 17.0 kN3818 lbf | 16.4 ft·lb22.2 N·m | 12.2 ft·lb16.6 N·m | 8.10 ft·lb11.0 N·m |
| 5/16" | 5/16"-24 UNF24 TPI | 27.1 kN6096 lbf | 31.5 ft·lb42.7 N·m | 23.5 ft·lb31.9 N·m | 15.5 ft·lb21.0 N·m |
| 3/8" | 3/8"-24 UNF24 TPI | 41.0 kN9220 lbf | 55.2 ft·lb74.9 N·m | 41.0 ft·lb55.6 N·m | 26.8 ft·lb36.3 N·m |
| 7/16" | 7/16"-20 UNF20 TPI | 55.4 kN12463 lbf | 85.8 ft·lb116.4 N·m | 63.8 ft·lb86.5 N·m | 41.8 ft·lb56.7 N·m |
| 1/2" | 1/2"-20 UNF20 TPI | 74.7 kN16792 lbf | 134.3 ft·lb182.1 N·m | 99.4 ft·lb134.7 N·m | 64.4 ft·lb87.3 N·m |
| 9/16" | 9/16"-18 UNF18 TPI | 94.8 kN21309 lbf | 189.1 ft·lb256.4 N·m | 139.9 ft·lb189.6 N·m | 90.6 ft·lb122.9 N·m |
| 5/8" | 5/8"-18 UNF18 TPI | 119.5 kN26870 lbf | 265.8 ft·lb360.4 N·m | 195.9 ft·lb265.7 N·m | 126.1 ft·lb171.0 N·m |
| 3/4" | 3/4"-16 UNF16 TPI | 174.2 kN39153 lbf | 461.9 ft·lb626.2 N·m | 339.9 ft·lb460.9 N·m | 218.0 ft·lb295.5 N·m |
| 7/8" | 7/8"-14 UNF14 TPI | 237.9 kN53484 lbf | 733.7 ft·lb994.7 N·m | 539.7 ft·lb731.7 N·m | 345.7 ft·lb468.8 N·m |
| 1" | 1"-12 UNF12 TPI | 309.6 kN69605 lbf | 1090.3 ft·lb1478.3 N·m | 802.5 ft·lb1088.1 N·m | 514.8 ft·lb697.9 N·m |
| 1-1/8" | 1-1/8"-12 UNF12 TPI | 399.6 kN89832 lbf | 1572.8 ft·lb2132.4 N·m | 1154.3 ft·lb1565.0 N·m | 735.9 ft·lb997.7 N·m |
| 1-1/4" | 1-1/4"-12 UNF12 TPI | 501.0 kN112636 lbf | 2179.6 ft·lb2955.2 N·m | 1596.0 ft·lb2163.8 N·m | 1012.3 ft·lb1372.5 N·m |
| 1-3/8" | 1-3/8"-12 UNF12 TPI | 613.9 kN138016 lbf | 2925.2 ft·lb3966.0 N·m | 2137.7 ft·lb2898.3 N·m | 1350.3 ft·lb1830.7 N·m |
| 1-1/2" | 1-1/2"-12 UNF12 TPI | 738.3 kN165973 lbf | 3823.6 ft·lb5184.1 N·m | 2789.8 ft·lb3782.4 N·m | 1755.9 ft·lb2380.7 N·m |
締付軸力は降伏荷重の70%です。トルクはISO 16047 / VDI 2230に基づき、標準六角頭で、ねじ面と座面に同じ摩擦係数μを用いて算出しています。サイズをクリックすると、二面幅、下穴径、計算例を確認できます。メーカー指定値がある場合は、必ずそちらに従ってください。
よくある質問
1/4" A574のボルトの締付トルクは？
乾燥状態で約14.7 ft·lb (20.0 N·m)、油潤滑で約11.2 ft·lb (15.2 N·m)です（1/4"-20 UNC、降伏荷重の70%、締付軸力14.9 kN）。
3/8" A574のボルトの締付トルクは？
乾燥状態で約50.2 ft·lb (68.1 N·m)、油潤滑で約37.9 ft·lb (51.3 N·m)です（3/8"-16 UNC、降伏荷重の70%、締付軸力36.2 kN）。
1/2" A574のボルトの締付トルクは？
乾燥状態で約122.7 ft·lb (166.3 N·m)、油潤滑で約92.2 ft·lb (125.0 N·m)です（1/2"-13 UNC、降伏荷重の70%、締付軸力66.3 kN）。