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Nord-Lock washers: Torque guidelines

The below torque values have been verified in test laboratories and represent a configuration example. The values are indicative and should not be seen as recommendations as varying conditions, joint designs and requirements apply. The Nord-Lock Group provides customized torque calculations to any standard, free of charge. Please fill out the torque guidelines form or contact your Nord-Lock office for support.

 

Nord-Lock - request for free custom calculation for torque guidelines  

 

Cu/C paste* = copper/graphite paste (Molykote® 1000)
Oil = WD40 has been used.
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

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]
3NL3M30,51,72,41,52,41,52,0
4NL4M40,73,84,23,64,23,53,5
5NL5M50,87,56,86,96,86,85,6
6NL6M61,013,19,712,19,711,98,0
7NL8M81,25321829182915
8NL10M101,5622857285623
9NL12M121,751074098409733
10NL14M142,0170551575515546
11NL16M162,0260752407523762
12NL18M182,5364923369233176
13NL20M202,551011847011846497
14NL22M222,5696146642146635120
15NL24M243,0878169809169800140
16NL27M273,0128422111832211171182
17NL30M303,5175026916132691596222
18NL33M333,5236033321733332155275
19NL36M364,0304339228033922776324
20NL39M394,0393146836194683589387
21NL42M424,5486053844765384436445
 ABCDEFGHI
1Washer sizeBolt sizePitch
[TPI]
Oil, GF=75%
µth=0,10, µb=0,16
Cu/C paste*, GF=75%
µth=0,11, µb=0,16
Dry, GF=62%
µth=0,15, µb=0,18
2   Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
3NL3#5401,15501,05501,1450
4NL3.5#6321,46301,36301,5520
5NL4#8322,79702,39702,6800
6NL5#10243,912003,512004,01000
7NL1/4"1/4209,122008,222009,01800
8NL85/1618183600163600183000
9NL3/8"3/816305400275400314400
10NL117/1614477300427300476100
11NL1/2"1/213739800669800748100
12NL149/161210412600931260010410400
13NL165/811145156001301560014612900
14NL3/4"3/410254231002272310025719100
15NL227/89408319003673190041326400
16NL1"18617418005564180062434600
17NL301 1/87771464006954640078038400
18NL331 1/4710755890096558900109048700
19NL361 3/86141070200127070200143058100
20NL391 1/26186085500167085500188070600
 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]
3NL3M30,52,03,22,03,4
4NL4M40,74,55,64,55,9
5NL5M50,88,99,18,99,6
6NL6M61,015,512,915,513,6
7NL8M81,2537233725
8NL10M101,573377339
9NL12M121,751265412657
10NL14M142,02017420178
11NL16M162,0307100306106
12NL18M182,5430123429130
13NL20M202,5602156600165
14NL22M222,5821194818205
15NL24M243,010362251034238
16NL27M273,015142941509310
17NL30M303,520643582058378
18NL33M333,527834432772468
19NL36M364,035895223576551
20NL39M394,046326244614659
21NL42M424,557317165709757
 ABCDEFG
1Washer sizeBolt sizePitch
[TPI]
Oil, GF=71%
µth=0,13, µb=0,14
Cu/C paste*, GF=75%
µth=0,11, µb=0,15
2   Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
3NL3#5401,57401,3780
4NL3.5#6321,98401,6890
5NL4#8323,5130031400
6NL5#10245,116004,41700
7NL1/4"1/420122900113100
8NL85/1618244900205100
9NL3/8"3/816417200357600
10NL117/16146498005410400
11NL1/2"1/21399131008313900
12NL149/16121381680011917800
13NL165/8111972090016622100
14NL3/4"3/4103463090029132700
15NL227/895564270047245100
16NL1"188405600071359200
17NL301 1/87119070600101574500
18NL331 1/47166089600140994600
19NL361 3/8621801070001852113000
20NL391 1/2628701300002433137000
 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]
3NL3M30,52,23,92,34,1
4NL4M40,75,16,75,37,1
5NL5M50,810,010,910,311,5
6NL6M61,017,415,41816,3
7NL8M81,2542284330
8NL10M101,582448547
9NL12M121,751426514668
10NL14M142,02268923394
11NL16M162,0345120355127
12NL18M182,5483148498156
13NL20M202,5676188696198
14NL22M222,5921233948246
15NL24M243,011652701199286
16NL27M273,017003521749372
17NL30M303,523184302385454
18NL33M333,531245323213562
19NL36M364,040296264145662
20NL39M394,051997485346790
21NL42M424,564348606617908
 ABCDEFG
1Washer sizeBolt sizePitch
[TPI]
Oil, GF=71%
µth=0,13, µb=0,12
Cu/C paste*, GF=75%
µth=0,11, µb=0,15
2   Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
3NL3#5401,78701,5910
4NL3.5#6322,29901,91050
5NL4#8323,815003,61600
6NL5#10245,819005,32000
7NL1/4"1/420133400123700
8NL85/1618265700226000
9NL3/8"3/816458400388900
10NL117/161470115005812200
11NL1/2"1/213109154009016300
12NL149/16121481980013720900
13NL165/8112162460017926000
14NL3/4"3/4103783640031238400
15NL227/896075020050653000
16NL1"189166590076469600
17NL301 1/87130083000108487700
18NL331 1/4718101050001507111000
19NL361 3/8623801260001990133000
20NL391 1/2631401530002600161000
 ABCDEFG
1Washer sizeBolt sizePitch
[mm]
A2-70, A4-70, Cu/C paste*
GF=65% µth=0,13, µh=0,13
A2-80, A4-80, Cu/C paste*
GF=65% µth=0,13, µh=0,13
2   Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
3NL3ssM30,50,81,51,12,0
4NL4ssM40,71,82,62,43,4
5NL5ssM50,83,64,14,85,5
6NL6ssM61,06,35,98,47,8
7NL8ssM81,2515112014
8NL10ssM101,530173923
9NL12ssM121,7551256833
10NL14ssM142,0813410845
11NL16ssM162,01244616561
12NL18ssM182,51735623175
13NL20ssM202,52427232395
14NL22ssM222,533089440118
15NL24ssM243,0418103557137
16NL27ssM273,0609134812179
17NL30ssM303,58311641108219
18NL36ssM364,014442391925319
 ABCDEFG
1Washer sizeBolt sizePitch
[TPI]
316-316L, GF=65%, Cu/C paste*
µth=0,12, µb=0,14
303-305, GF=65%, Cu/C paste*
µth=0,12, µb=0,14
2   Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
3NL3ss#5400,73250,7325
4NL3.5ss#6320,93700,9370
5NL4ss#8321,45751,4575
6NL5ss#10242,27202,2720
7NL1/4"ss1/4205130051300
8NL8ss5/16189,922009,92200
9NL3/8"ss3/816173300173300
10NL11ss7/1614224500224500
11NL1/2"ss1/213416000416000
12NL14ss9/1612597700597700
13NL16ss5/811839500839500
14NL3/4"ss3/41010198001019800
15NL22ss7/891641350016413500
16NL1"ss182471770024717700
17NL30ss1 1/873512230035122300
18NL36ss1 3/866433380064333800
 ABCDEFG
1Washer sizeBolt sizePitch
[mm]
A2-70, A4-70, Cu/C paste*
GF=65% µth=0,13, µh=0,13
A2-80, A4-80, Cu/C paste*
GF=65% µth=0,13, µh=0,13
2   Torque
[Nm]
Clamp load
[kN]
Torque
[Nm]
Clamp load
[kN]
3NL3ss-254M30,50,81,51,12,0
4NL4ss-254M40,71,82,62,43,4
5NL5ss-254M50,83,64,14,85,5
6NL6ss-254M61,06,35,98,47,8
7NL8ss-254M81,2515112014
8NL10ss-254M101,530173923
9NL12ss-254M121,7551256833
10NL14ss-254M142,0813410845
11NL16ss-254M162,01244616561
12NL18ss-254M182,51735623175
13NL20ss-254M202,52427232395
14NL22ss-254M222,533089440118
15NL24ss-254M243,0418103557137
16NL27ss-254M273,0609134812179
17NL30ss-254M303,58311641108219
18NL36ss-254M364,014442391925319
 ABCDEFG
1Washer sizeBolt sizePitch
[TPI]
316-316L, GF=65%, Cu/C paste*
µth=0,12, µb=0,14
303-305, GF=65%, Cu/C paste*
µth=0,12, µb=0,14
2   Torque
[ftlb]
Clamp load
[lb]
Torque
[ftlb]
Clamp load
[lb]
3NL3ss-254#5400.73250,7325
4NL3.5ss-254#6320.93700,9370
5NL4ss-254#8321.45751,4575
6NL5ss-254#10242.27202,2720
7NL1/4"ss-2541/4205130051300
8NL8ss-2545/16189.922009,92200
9NL3/8"ss-2543/816173300173300
10NL11ss-2547/1614224500224500
11NL1/2"ss-2541/213416000416000
12NL14ss-2549/1612597700597700
13NL16ss-2545/811839500839500
14NL3/4"ss-2543/41010198001019800
15NL22ss-2547/891641350016413500
16NL1"ss-254182471770024717700
17NL30ss-2541 1/873512230035122300
18NL36ss-2541 3/866433380064333800