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Torque tables: Nord-Lock X-series

The figures are based on tests with calibrated torque transmitters and load cells performed in our laboratory. Thread friction coefficients have theoretical values but are verified through testing. Under head friction coefficients have been established by tests. The below values are to be considered as recommended nominal values to maximize the preload achieved in joints secured with Nord-Lock X-series washers.

 

Cu/C paste* Copper/graphite paste (Molykote® 1000)
GF Ratio of yield point. When tightening according to guidelines and with no deviation,
this is the pre-stress achieved expressed as % of yield point.
μth Thread friction coefficient
μh Under head friction coefficient
1 N 0,225 lb
1 Nm 0,738 ft-lb

 

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Units: Metric UNC
  A B C D E F G H I
1 Washer size Bolt size Pitch
[mm]
Oil, GF=75%
µth=0,15, µh=0,19
Cu/C paste*, GF=75%
µth=0,13, µh=0,18
Dry, GF=62%
µth=0,18, µh=0,2
2       Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
3 NLX6 M6 1,0 13 9,7 12 9,7 12 8,0
4 NLX8 M8 1,25 32 18 29 18 29 15
5 NLX10 M10 1,5 62 28 57 28 56 23
6 NLX12 M12 1,75 107 40 99 40 97 33
7 NLX14 M14 2,0 170 55 157 55 155 46
8 NLX16 M16 2,0 260 75 240 75 237 62
9 NLX20 M20 2,5 510 118 470 118 464 97
  A B C D E F G H I
1 Washer size Bolt size Pitch
[TPI]
Oil, GF=75%
µth=0,08, µh=0,18
  Cu/C paste*, GF=75%
µth=0,08, µh=0,19
  Dry, GF=55%
µth=0,19, µh=0,2
 
2       Torque
[ft lb]
Clamp load
[lb]
Torque
[ft lb]
Clamp load
[lb]
Torque
[ft lb]
Clamp load
[lb]
3 NL8 5/16 18 17,7 3674 18,3 3674 17,8 2694
4 NL3/8" 3/8 16 31 5424 32 5424 31,4 3978
5 NL1/2" 1/2 13 74,5 9920 77,1 9920 76 7271
6 NL14 9/16 12 107 12712 110,8 12712 109,3 9322
7 NL16 5/8 11 147,6 15786 152,8 15786 150,9 11576
8 NL3/4" 3/4 10 258,2 23335 267,4 23335 266 17112
  A B C D E F G
1 Washer size Bolt size Pitch
[mm]
Oil, GF=71%
µth=0,15, µh=0,15
Cu/C paste*, GF=75%
µth=0,13, µh=0,15
2       Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
3 NLX6 M6 1,0 15,5 12,9 15,5 13,6
4 NLX8 M8 1,25 37 23 37 25
5 NLX10 M10 1,5 73 37 73 39
6 NLX12 M12 1,75 126 54 126 57
7 NLX14 M14 2,0 201 74 201 78
8 NLX16 M16 2,0 307 100 306 106
9 NLX20 M20 2,5 602 156 600 165
  A B C D E F G
1 Washer size Bolt size Pitch
[TPI]
Oil, GF=71%
µth=0,08, µh=0,14
  Cu/C paste*, GF=75%
µth=0,07, µb=0,15
 
2       Torque
[ft lb]
Clamp load
[lb]
Torque
[ft lb]
Clamp load
[lb]
3 NL8 5/16 18 20 4915 22 5192
4 NL3/8" 3/8 16 36 7256 38 7665
5 NL1/2" 1/2 13 86 13270 91 14017
6 NL14 9/16 12 123 16771,4 131 17963
7 NL16 5/8 11 170 21117 180 22307
8 NL3/4" 3/4 10 296 31214 315 32973