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Washers brochure - Product Information (Metric) - 9 / 16 Pages

Torque guidelines
Nord-Lock steel washers with zinc flake coating (Delta Protekt®)

Nord-Lock steel washers with electro zinc plated bolt (grade 5)
Oil, GF =75%
µth = 0,10, µb = 0,16
Washer
size

Bolt
size

Pitch
[TPI]

Torque
[ftlb]

NL3
NL3.5
NL4
NL5
NL1/4”
NL8
NL3/8”
NL11
NL1/2”
NL14
NL16
NL3/4”
NL22
NL1”
NL30
NL33
NL36
NL39

#5
#6
#8
#10
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2

40
32
32
24
20
18
16
14
13
12
11
10
9
8
7
7
6
6

1.1
1.4
2.7
3.9
9.1
18
30
47
73
104
145
254
408
617
771
1075
1410
1860

Cu/C paste, GF =75%
µth = 0,11, µb = 0,16

Clamp
load [lb]

Dry, GF =62%
µth = 0,15, µb = 0,18

Clamp
load [lb]

Torque
[ftlb]

1.0
1.3
2.3
3.5
8.2
16
27
42
66
93
130
227
367
556
695
965
1270
1670

550
630
970
1,200
2,200
3,600
5,400
7,300
9,800
12,600
15,600
23,100
31,900
41,800
46,400
58,900
70,200
85,500

Torque
[ftlb]

550
630
970
1200
2200
3600
5400
7300
9800
12600
15600
23100
31900
41800
46400
58900
70200
85500

1.1
1.5
2.6
4.0
9.0
18
31
47
74
104
146
257
413
624
780
1090
1430
1880

Nord-Lock steel washers with non-plated bolt (grade 8)
Oil, GF =71%
µth = 0,13, µb = 0,14
Washer
size

NL3
NL3.5
NL4
NL5
NL1/4”
NL8
NL3/8”
NL11
NL1/2”
NL14
NL16
NL3/4”
NL22
NL1”
NL30
NL33
NL36
NL39

Cu/C paste = Copper/graphite paste (Molykote® 1000)
GF  =   atio of yield point
r
µth  =   hread friction
t
µb  =   asher friction
w

Clamp
load [lb]

450
520
800
1,000
1,800
3,000
4,400
6,100
8,100
10,400
12,900
19,100
26,400
34,600
38,400
48,700
58,100
70,600

1 lbf = 4.448 N
1 ft-lb = 1.356 Nm

Nord-Lock steel washers with non-plated ASTM A574 bolt, (high-grade)
Oil, GF =71%
µth = 0,13, µb = 0,12

Cu/C paste, GF =75%
µth = 0,11, µb = 0,15

Bolt
size

Pitch
[TPI]

Torque
[ftlb]

Clamp
load [lb]

Torque
[ftlb]

Clamp
load [lb]

Washer
size

#5
#6
#8
#10
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2

40
32
32
24
20
18
16
14
13
12
11
10
9
8
7
7
6
6

1.5
1.9
3.5
5.1
12
24
41
64
99
138
197
346
556
840
1190
1660
2180
2870

740
840
1,300
1,600
2,900
4,900
7,200
9,800
13,100
16,800
20,900
30,900
42,700
56,000
70,600
89,600
107,000
130,000

1.3
1.6
3
4.4
11
20
35
54
83
119
166
291
472
713
1015
1409
1852
2433

780
890
1,400
1,700
3,100
5,100
7,600
10,400
13,900
17,800
22,100
32,700
45,100
59,200
74,500
94,600
113,000
137,000

NL3
NL3.5
NL4
NL5
NL1/4”
NL8
NL3/8”
NL11
NL1/2”
NL14
NL16
NL3/4”
NL22
NL1”
NL30
NL33
NL36
NL39

Torque guidelines for other bolt grades are available through your local Nord-Lock representative.

9

Bolt
size

#5
#6
#8
#10
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2

Cu/C paste, GF =75%
µth = 0,11, µb = 0,15

Pitch
[TPI]

Torque
[ftlb]

Clamp
load [lb]

Torque
[ftlb]

Clamp
load [lb]

40
32
32
24
20
18
16
14
13
12
11
10
9
8
7
7
6
6

1.7
2.2
3.8
5.8
13
26
45
70
109
148
216
378
607
916
1300
1810
2380
3140

870
990
1,500
1,900
3,400
5,700
8,400
11,500
15,400
19,800
24,600
36,400
50,200
65,900
83,000
105,000
126,000
153,000

1.5
1.9
3.6
5.3
12
22
38
58
90
137
179
312
506
764
1084
1507
1990
2600

910
1050
1600
2000
3700
6000
8900
12,200
16,300
20,900
26,000
38,400
53,000
69,600
87,700
111,000
133,000
161,000

Washers brochure - Product Information (Metric)
  1. P. 1

  2. P. 4

    Widely used &globally approvedNord-Lock washers are high end products with documentedsuccess in many industries. Our washers are approvedby several...
  3. P. 5

    The key to efficient& secure operationsNord-Lock washers provide more than just a safe lockingfunction, using our washers also improves the generalperformance...
  4. P. 6

    Using Nord-LockwashersNord-Lock washers are easy and effective to use whileensuring structural security for applications exposed tovibration and dynamic...
  5. P. 7

    Nord-Lock washer material / type guideApplicationparameterSteelwashersStainless steel (ss)washers254 SMO ®washersINCONEL® /HASTELLOY® C-276...
  6. P. 8

    Nord-Lock steel washersEN 1.7182 or equivalent, zinc flake coating (Delta Protekt®), through hardenedDimension chartWasher sizeBolt sizeUNCNL3NL3.5NL3.5spNL4NL4spNL5NL5spNL6NL6spNL1/4”NL1/4”spNL8NL8spNL3/8”NL3/8”spNL10NL10spNL11NL12NL12spNL1/2”NL1/2”spNL14NL14spNL16NL16spNL18NL18spNL3/4”NL3/4”spNL20NL20spNL22NL22spNL24NL24spNL1”NL1”spNL27NL27spNL30NL30spNL33NL33spNL36NL36spNL39NL42NL45NL48NL52NL56NL60NL64NL68NL72NL76NL80NL85NL90NL95NL100NL105NL110NL115NL120NL125NL1308#5#6#6#8#8#10#10MetricM3M3.5M3.5M4M4M5M5M6M61/4”1/4”5/16”5/16”3/8”3/8”M8M87/16”M10M10M11M12M121/2”1/2”9/16”9/16”5/8”5/8”M14M14M16M16M18M183/4”3/4”7/8”7/8”M20M20M22M22M24M241”1”11111111/8”1/8”1/4”1/4”3/8”3/8”1/2”1...
  7. P. 9

  8. P. 10

    Nord-Lock stainless steel washersEN 1.4404 (AISI 316L) or equivalent, surface hardenedEN 1.4404 is an austenitic chromium-nickel stainless steel containing...
  9. P. 11

    Nord-Lock 254 SMO® washersEN 1.4547 or equivalent, surface hardened254 SMO® is a high performance austenitic stainless steel (according to EN...
  10. P. 12

    Nord-Lock washers joint guideTapped holesNord-Lock washers safely lock the bolt against the underlying surface.Counter boresThe outer diameter of regular...
  11. P. 13

    Nord-Lock “sp” (enlarged outer diameter) washersNord-Lock washers are available with an enlarged outer diameter,referred to as “sp”...
  12. P. 14

    Your partner inbolt securingThe Nord-Lock Group offers continuous support; fromdesign phase, testing and verification, through installationand maintenance....
Text version

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