CAUTION
更换螺栓时,总是使用和原来相同规格和强度的螺栓。使用不正确的螺栓会损坏发动机。
公制螺栓和螺母可以通过看螺栓头部或螺母表面上刻有的分级标号来辨认,美制螺栓可以通过看螺栓头部刻有的径向标记线来辨认。
下例说明了如何辨认螺栓:
LARGE
|
LARGE
|
LARGE
|
螺钉等级 | 8.8 | 10.9 | 12.9 | |||||||||
材料 | 铸铁 | 铝 | 铸铁 | 铝 | 铸铁 | 铝 | ||||||
螺钉体直径 [ mm ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] |
6 | 9 | 5 | 7 | 4 | 13 | 10 | 7 | 4 | 14 | 9 | 7 | 4 |
7 | 14 | 9 | 11 | 7 | 18 | 14 | 11 | 7 | 23 | 18 | 11 | 7 |
8 | 23 | 17 | 18 | 14 | 33 | 25 | 18 | 14 | 40 | 29 | 18 | 14 |
10 | 45 | 33 | 30 | 25 | 65 | 50 | 30 | 25 | 70 | 50 | 30 | 25 |
12 | 80 | 60 | 55 | 40 | 115 | 85 | 55 | 40 | 125 | 95 | 55 | 40 |
14 | 125 | 90 | 90 | 65 | 180 | 133 | 90 | 65 | 195 | 145 | 90 | 65 |
16 | 195 | 140 | 140 | 100 | 280 | 200 | 140 | 100 | 290 | 210 | 140 | 100 |
18 | 280 | 200 | 180 | 135 | 390 | 285 | 180 | 135 | 400 | 290 | 180 | 135 |
20 | 400 | 290 | — | — | 550 | 400 | — | — | — | — | — | — |
LARGE
|
螺钉等级 | 5 | 8 | ||||||
材料 | 铸铁 | 铝 | 铸铁 | 铝 | ||||
螺钉体直径 [ in ] 和 T.P.I. | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] | 扭矩 [ N•m ] | 扭矩 [ ft-lb ] |
1/4 - 20 | 9 | 7 | 8 | 6 | 15 | 11 | 8 | 6 |
1/4 - 28 | 12 | 9 | 9 | 7 | 18 | 13 | 9 | 7 |
5/16 - 18 | 20 | 15 | 16 | 12 | 30 | 22 | 16 | 12 |
5/16 - 24 | 23 | 17 | 19 | 14 | 33 | 24 | 19 | 14 |
3/8 - 16 | 40 | 30 | 25 | 20 | 55 | 40 | 25 | 20 |
3/8 - 24 | 40 | 30 | 35 | 25 | 60 | 45 | 35 | 25 |
7/16 - 14 | 60 | 45 | 45 | 35 | 90 | 65 | 45 | 35 |
7/16 - 20 | 65 | 50 | 55 | 40 | 95 | 70 | 55 | 40 |
1/2 - 13 | 95 | 70 | 75 | 55 | 130 | 95 | 75 | 55 |
1/2 - 20 | 100 | 75 | 80 | 60 | 150 | 110 | 80 | 60 |
9/16 - 12 | 135 | 100 | 110 | 80 | 190 | 140 | 110 | 80 |
9/16 - 18 | 150 | 110 | 115 | 85 | 210 | 155 | 115 | 85 |
5/8 - 11 | 180 | 135 | 150 | 110 | 255 | 190 | 150 | 110 |
5/8 - 18 | 210 | 155 | 160 | 120 | 290 | 215 | 160 | 120 |
3/4 - 10 | 325 | 240 | 255 | 190 | 460 | 340 | 255 | 190 |
3/4 - 16 | 365 | 270 | 285 | 210 | 515 | 380 | 285 | 210 |
7/8 - 9 | 490 | 360 | 380 | 280 | 745 | 550 | 380 | 280 |
7/8 - 14 | 530 | 390 | 420 | 310 | 825 | 610 | 420 | 310 |
1 - 8 | 720 | 530 | 570 | 420 | 1100 | 820 | 570 | 420 |
1 - 14 | 800 | 590 | 650 | 480 | 1200 | 890 | 650 | 480 |