MB ZTS - Fastener Torque Recommendations (Continued); Metric Fastener Torque-Tension

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Publication: ZTS-080812
M-B Companies, Inc. 11/15/12
INTRODUCTIONFASTENER TORQUE RECOMMENDATION
TORQUE-TENSION RELATIONSHIP FOR METRIC FASTENERS
Nominal
Dia.
Pitch
Tightening Torque Tightening Torque Tightening Torque Tightening Torque
Lubed
Dry
Plated
Dry
Plain
Lubed
Dry
Plated
Dry
Plain
Lubed
Dry
Plated
Dry
Plain
Lubed
Dry
Plain
(mm)
K = 0.15
(ft-lbs)
K = 0.17
(ft-lbs)
K = 0.20
(ft-lbs)
K = 0.15
(ft-lbs)
K = 0.17
(ft-lbs)
K = 0.20
(ft-lbs)
K = 0.15
(ft-lbs)
K = 0.17
(ft-lbs)
K = 0.20
(ft-lbs)
K = 0.15 K = 0.20
3 0.5 0.28 0.32 0.38 0.73 0.82 0.97 1.0 1.2 1.4 1.2 1.6
3.5 0.6 0.44 0.50 0.59 1.1 1.3 1.5 1.6 1.9 2.2 1.9 2.5
4 0.7 0.66 0.74 0.87 1.7 1.9 2.3 2.4 2.7 3.2 2.8 3.8
5 0.8 1.3 1.5 1.8 3.4 3.9 4.5 4.9 5.5 6.5 5.7 7.6
6 1 2.3 2.6 3.0 5.8 6.6 7.7 8.3 9.4 11 9.7 13
6 1.25 2.1 2.3 2.7 5.3 6.0 7.0 7.6 8.6 10 8.8 12
7 1 3.8 4.3 5.0 9.7 11 13 14 16 19 16 22
8 1 5.9 6.6 7.8 15 17 20 22 24 29 25 34
8 1.25 5.5 6.2 7.3 14 16 19 20 23 27 24 31
10 1.25 11 13 15 29 33 39 42 48 56 49 66
10 1.5 11 12 14 28 32 37 40 45 53 47 62
12 1.25 21 23 28 53 60 71 76 86 101 89 119
12 1.5 20 22 26 51 58 68 73 82 97 85 113
12 1.75 19 21 25 49 55 65 70 79 93 81 108
14 1.25 26 29 34 66 75 89 95 106 127 111 148
14 1.5 28 32 37 72 82 96 103 117 138 121 161
14 2 30 34 40 78 88 104 111 126 148 130 173
16 1.5 50 57 67 129 146 171 184 208 245 215 287
16 2 47 53 62 121 137 161 173 196 230 202 269
18 1.5 73 82 97 187 212 249 266 303 357 313 417
18 2.5 65 73 86 167 189 222 239 270 318 279 372
20 2.5 91 104 122 236 267 314 337 382 449 394 525
Clamp load calculated as 75% of the proof load for specified bolts.
All Torque values are listed in foot-pounds
Torque values calculated from formulas T=KDF, where
K = 0.15 for “lubricated” conditions
K = 0.17 for zinc plated and dry conditions
K = 0.20 for plain and dry conditions
D = Nominal Diameter
F = Clamp Load
4.6
Class 4.6
8.8
Class 8.8
10.9
Class 10.9
10.9
Class 12.9