Page 691 - Mastik®

Reference values for tightening torque Preload and
®
NORD-LOCK washers tightening torques
wedge-locking system

The recommended tightening torques are based on laboratory tests and should be checked for each specific application.

= Yield point ratio (degree of utilization of bolt material yield strength in percent)
μg = Thread friction coefficient
μs = Washer friction coefficient

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NORD-LOCK zinc flake coated washers paired with screws/bolts 12.9, non-plated
w Thread 0,71 Graphite paste
Oiled
Pitch
0,75
μ g 0,08
μ g 0,13
[mm] μ s 0,12 μ s 0,11
Torque Preload Torque Preload
[Nm] [kN] [Nm] [kN]
DNL3 M3 0,5 2 3,9 1,7 4,1
DNL4 M4 0,7 4,6 6,7 4 7,1
DNL5 M5 0,8 9,1 10,9 7,7 11,5
DNL6 M6 1 15,8 15,4 13,5 16,3
DNL8 M8 1,25 38 28 32 30
DNL10 M10 1,5 75 44 64 47
DNL12 M12 1,75 128 65 109 68
DNL14 M14 2 204 89 174 94
DNL16 M16 2 311 120 263 127
DNL18 M18 2,5 437 148 370 156
DNL20 M20 2,5 610 188 515 198
DNL22 M22 2,5 831 233 699 246
DNL24 M24 3 1052 270 887 286
DNL27 M27 3 1533 352 1288 372
DNL30 M30 3,5 2091 430 1761 454
DNL33 M33 3,5 2815 532 2362 562
DNL36 M36 4 3633 626 3053 662
DNL39 M39 4 4683 748 3925 790
DNL42 M42 4,5 5799 860 4866 908

NORD-LOCK stainless steel washers with austenitic screws/bolts with graphite paste
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w Thread A4-70, Graphite paste A4-80, Graphite paste
0,65
Pitch
0,65
μ g 0,14
μ g 0,14
[mm] μ s 0,15 μ s 0,15
Torque Preload Torque Preload
[Nm] [kN] [Nm] [kN]
DNL3 M3 0,5 0,9 1,5 1,2 2
DNL4 M4 0,7 2 2,6 2,7 3,4
DNL5 M5 0,8 3,9 4,1 5,3 5,5
DNL6 M6 1 6,9 5,9 9,2 7,8
DNL8 M8 1,25 17 11 22 14
DNL10 M10 1,5 33 17 43 23
DNL12 M12 1,75 56 25 75 33
DNL14 M14 2 89 34 119 45
DNL16 M16 2 136 46 181 61
DNL18 M18 2,5 191 56 254 75
DNL20 M20 2,5 267 72 356 95
DNL22 M22 2,5 364 89 485 118
DNL24 M24 3 460 103 613 137
DNL27 M27 3 671 134 895 179
DNL30 M30 3,5 915 164 1220 219
DNL36 M33 4 1591 239 2121 319