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Nord-Lock X-series washers: Torque guidelines

All figures are based on tests with calibrated torque transmitters and load cells performed in our laboratory. Torque guidelines available below for all standard materials and sizes. These values are to be considered as recommended nominal values to maximize the preload achieved in joints secured with Nord-Lock X-series washers.

 

Should you require torque guidelines for other bolt grades, sizes or materials, we will be able to support you. Please address performance-services@nord-lock.com go to Contact us to find your local Nord-Lock office or authorized distributor.

 

Cu/C paste* = Copper/graphite paste (Molykote® 1000)
GF = ratio of yield point
μth = thread friction
μh = washer friction
1 N = 0,225 lb
1 Nm = 0,738 ft-lb

Units: Metric UNC
 ABCDEFGHI
1Washer sizeBolt sizePitch
[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]
3NLX6M61,0139,7129,7128,0
4NLX8M81,25321829182915
5NLX10M101,5622857285623
6NLX12M121,751074099409733
7NLX14M142,0170551575515546
8NLX16M162,0260752407523762
9NLX20M202,551011847011846497
 ABCDEFG
1Washer sizeBolt sizePitch
[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]
3NLX6M61,015,512,915,513,6
4NLX8M81,2537233725
5NLX10M101,573377339
6NLX12M121,751265412657
7NLX14M142,02017420178
8NLX16M162,0307100306106
9NLX20M202,5602156600165
 ABCDEFG
1Washer sizeBolt sizePitch
[mm]
Oil, GF=71%
µth=0,15, µh=0,13
Cu/C paste*, GF=75%
µth=0,13, µh=0,14
2   Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
3NLX6M61,017,415,41816,3
4NLX8M81,2542284330
5NLX10M101,582448547
6NLX12M121,751426514668
7NLX14M142,02268923394
8NLX16M162,0345120355127
9NLX20M202,5676188696198