Curtis 1YANSAPR, Installation & Owner'S Manual

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Torque Specs. for Structural Bolts
This page is for use primarily when dealing with high - strength vehicle fasteners such as ROPS hardware that hold the
structure together for safety. This page can also be used for other solid metal - to - metal joints. Do not use these high torque
values on any of the following applications involving: tubing, plastic, nylon or rubber washers, threaded inserts, etc.. See
previous page regarding less critical fasteners.
The values below apply to fasteners that are dry or lubricated with normal engine oil. They do not apply if special graphited or
moly disulphide greases or other extreme pressure lubricants are used. This applies to both UNF and UNC threads.
Remember to always use the same grade or property class when replacing bolts.
Size of Screw Property Class
Course Thread Fine Thread
Pitch (mm) Pounds Feet Newton - Meters Pitch (mm) Pounds Feet Newton - Meters
M6
5.6
1.0
3.6 - 5.8 4.9 - 7.9
-
- -
8.8 5.8 - 9.4 7.9 - 12.7 - -
10.9 7.2 - 10 9.8 - 13.6 - -
M8
5.6
1.25
7.2 - 14 9.8 - 19
1.0
12 - 17 16.3 - 23
8.8 17 - 22 23 - 29.8 19 - 27 25.7 - 36.6
10.9 20 - 26 27.1 - 35.2 22 - 31 29.8 - 42
M10
5.6
1.5
20 - 25 27.1 - 33.9
1.25
20 - 29 27.1 - 39.3
8.8 34 - 40 46.1 - 54.2 35 - 47 47.4 - 63.7
10.9 38 - 46 51.5 - 62.3 40 - 52 54.2 - 70.5
M12
5.6
1.75
28 - 34 37.9 - 46.1
1.25
31 - 41 42 - 55.6
8.8 51 - 59 69.1 - 79.9 55 - 68 75.9 - 92.1
10.9 57 - 66 77.2 - 89.4 62 - 75 84 - 101.6
M14
5.6
2.0
49 - 56 66.4 - 75.9
1.5
52 - 64 70.5 - 86.7
8.8 81 - 93 109.8 - 126 90 - 106 122 - 143.6
10.9 96 - 109 130.1 - 147.7 107 - 124 145 - 168
M16
5.6
2.0
67 - 77 90.8 - 104.3
1.5
69 - 83 93.6 - 112.5
8.8
116 - 130 157.2 - 176.2 120 - 138 162.6 - 187
10.9 129 - 145 174.8 - 196.5 140 - 158 189.7 - 214.1
M18
5.6
2.0
88 - 100 119.2 - 136
1.5
100 - 117 136 - 158.5
8.8
150 - 168 203.3 - 227.6 177 - 199 239.8 - 269.6
10.9 175 - 194 237.1 - 262.9 202 - 231 273.7 - 313
M20
5.6
2.5
108 - 130 146.3 - 176.2
1.5
132 - 150 178.9 - 203.3
8.8 186 - 205 252 - 277.8 206 - 242 279.1 - 327.9
10.9 213 - 249 288.6 - 337.4 246 - 289 333.3 - 391.6
METRIC BOLT TORQUE SPECIFICATIONS
5.6 8.8 10.9
SAE Grade No.
Bolt head identification
mark as per grade.
NOTE: Manufacturing
Marks Will Vary
TORQUE TORQUE TORQUE
Bolt Size Pounds Feet Newton - Meters Pounds Feet Newton - Meters Pounds Feet Newton - Meters
Inches Millimeters Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
1/4 6.35 5 6 7 8 9 11 12 15 12 15 16 20
5/16 7.94 10 12 14 16 17 20.5 23 28 24 29 33 39
3/8 9.53 20 23 27 31 35 42 48 57 45 54 61 73
7/16 11.11 30 35 41 47 54 64 73 87 70 84 95 114
1/2 12.70
45 52 61 70 80 96 109 130 110 132 149 179
9/16 14.29
65 75 88 102 110 132 149 179 160 192 217 260
5/8 15.88
95 105 129 142 150 180 203 244 220 264 298 358
3/4 19.05
150 185 203 251 270 324 366 439 380 456 515 618
7/8 22.23
160 200 217 271 400 480 542 651 600 720 814 976
1 25.40
250 300 339 406 580 696 787 944 900 1080 1220 1464
1 - 1/8 25.58
- - - - 800 880 1085 1193 1280 1440 1736 1953
1 - 1/4 31.75 - - - - 1120 1240 1519 1681 1820 2000 2468 2712
1 - 3/8 34.93 - - - - 1460 1680 1980 2278 2380 2720 3227 3688
1 - 1/2 38.10 - - - - 1940 2200 2631 2983 3160 3560 4285 4827
*Thick Nuts must be used with Grade 8 bolts
5
8*
2