TABLE 1
Grade 2 Nuts
Grade 5 Nuts
Grade 8 Nuts
Prevailing Torque
Prevailing Torque
Prevailing Torque
First Removal
Fifth Removal
First Removal
Fifth Removal
First Removal
Fifth Removal
Highest Lowest Highest Lowest
First
Clamp
Proof
Highest Lowest Highest Lowest
First
Clamp
Proof
Highest Lowest Highest Lowest
First
Clamp
Proof
Locknut
Read- Read-ing
Read-
Read-
Install
Load
Load
Read-
Read-
Read-
Read-
Install
Load
Load
Read-
Read-
Read-
Read-
Install
Load
Load
Nominal
Min
ing
ing
ing
In. Lb.
Lb.
Lb.
ing
ing
ing
ing
In. Lb.
Lb.
Lb.
ing
ing
ing
ing
In Lb.
Lb.
Lb.
Size and
In. Lb.
Min
Min
Min
Max
Min
Min
Min
Min
Max
Min
Min
Min
Min
Max
Threads
In. Lb. In. Lb. In. Lb.
In. Lb. In. Lb. In. Lb. In. Lb.
In. Lb. In. Lb. In. Lb. In. Lb.
Per Inch
Coarse Thread Series
.0730-64
.0860-56
.0990-48
.5
1.0
4.0
550
910
.2
.5
.5
1.0
3.0
380
720
.2
.5
.5
1.0
.2
.5
3.0
250
540
.1120-40
.1250-40
1.0
2.0
8.0
810
1,350
.5
1.0
.5
1.5
8.0
580
1,100
.5
1.0
.5
1.5
.5
1.5
6.0
370
820
.1380-32
1.0
2.5
12
1,250
2,100
.5
1.5
1.0
2.0
12.0
900
1,700
.5
1.5
1.0
2.0
1.0
9.0
2.0
580
1,250
.1640-32
1.5
3.5
17
1,550
2,600
1.0
2.0
1.0
2.5
13
1,100
2,100
1.0
2.0
1.0
2.5
1.0
13
2.5
720
1,550
.1900-24
2
4.5
27
2,200
3,650
1.0
2.5
1.5
3.5
20
1,550
2,900
1.0
2.5
1.5
3.5
1.5
20
3.0
1,000
2,200
.2160-24
.2500-20
2,900
1,300
30
5.0
2.5
3.5
1.5
3,800
2,000
30
5.0
2.5
3.5
1.5
4,750
2,850
40
6.0
3
4.5
2
.3125-18
4,700
2,150
60
8.0
4
5.5
2.5
6,300
3,350
60
8.0
4
5.5
2.5
7,850
4,700
80
10.5
5
7.5
3
.3750.16
7,000
3,200
80
12
5
8.5
4
9,300
4,950
80
12
5
8.5
4
11,600
6,950
110
16
7.5
11.5
5
.4375-14
9,550
4,400
100
17
7.5
12
5
12,800
6,800
100
17
7.5
12
5
15,900
9,600
135
23
10
16
7.5
.5000-13
12,800
5,850
150
22
10
15
7.5
17,000
9,050
150
22
10
15
7.5
21,300
12,800
17
30
15
20
10
* ft lb.
* ft lb.
*ft lb.
.5625-12
16,400
7,550
17*
30
15
21
10
21,800
11,600
17*
30
15
21
10
27,300
16,400
25*
40
20
28
12.5
.6250-11
20,300
9,300
25*
39
17.5
27
12.5
27,200
14,500
25*
39
17.5
27
12.5
33,900
20,300
35*
52
25
36
15
.7500-10
30,000
13,800
35*
58
25
41
20
40,100
21,300
35*
58
25
41
20
50,100
30,100
45*
78
35
54
25
.8750-9
41,600
11,400
50*
88
40
62
30
55,400
29,500
50*
88
40
62
30
69,300
41,600
70*
117
50
82
40
1.000-8
54,500
15,000
70*
120
60
84
40
72,700
38,700
70*
120
60
84
40
90,900
54,600
90*
160
80
112
50
1.1250-7
68,700
18,900
75*
150
70
105
50
80,100
42,100
75*
150
70
105
50
115,000
69,000
100*
200
100
140
70
1.2500-7
87,200
24,000
85*
188
90
132
60
101,700
53,500
85*
188
90
132
60
145,000
87,000
110*
250
120
176
80
1.3750-6
104,000
28,700
100*
220
110
154
70
121,300
63,800
100*
220
110
154
70
173,000
104,000
135*
293
140
205
100
1.5000.6
126,000
34,800
110*
260
130
182
90
147,500
77,600
110*
260
130
182
90
211,000
127,000
150*
346
170
242
120
Fine
Thread Series
.0600-80
.0730-72
.0860-64
.0990-56
.1120-48
600
270
3.0
1.0
.5
.5
.2
790
420
3.0
1.0
.5
.5
.2
990
600
4.0
1.0
.5
.5
.2
.1250-44
.1380-40
900
420
6.0
1.5
.5
1.0
.5
1,200
640
8.0
1.5
.5
1.0
.5
1,500
900
8.0
2.0
1.0
1.0
.5
.1640-36
1,350
9.0
2.0
1.0
1.5
.5
1,750
930
12
2.0
1.0
1.5
.5
2,200
1,300
12
2.5
1.0
2.0
1.0
.1900-32
1,800
840
13
2.5
1.0
2.0
1.0
2,400
1,300
13
2.5
1.5
2.0
1.0
3,000
1,800
17
3.5
1.5
2.5
1.0
.2160-28
2,300
1,050
20
3.5
1.5
2.5
1.0
3,100
1,650
20
3.5
1.5
2.5
1.0
3,900
2,350
27
4.5
2
3.0
1.5
.2500-28
3,300
1,500
30
5
2.5
3.5
1.5
4,350
2,300
30
5.0
2.5
3.5
1.5
5,450
3,250
40
6.0
3
4.5
2
.3125-24
5,200
2,400
60
8
4
5.5
2.5
6,950
3,700
60
8.0
4
5.5
2.5
8,700
5,200
80
10.5
5
7.5
3
.3750-24
7,900
3,600
80
12
5
8.5
4
10,500
5,600
80
12
5
8.5
4
13,200
7,900
110
16
7.5
11.5
5
.4375-20
10,700
4,900
100
17
7.5
12
5
14,200
7,550
100
17
7.5
12
5
17,800
10,700
135
23
10
16
7.5
.5000-20
14,400
6,550
150
22
10
15
7.5
19,200
10,200
150
22
10
15
7.5
24,000
14,400
17
30
15
20
10
* ft lb.
* ft lb.
*ft lb.
.5625-18
18,300
8,350
17*
30
15
21
10
24,400
13,000
17*
30
15
21
10
30,400
18,300
25*
40
20
28
12.5
.6250-18
22,900
10,500
25*
39
17.5
27
12.5
30,700
16,300
25*
39
17.5
27
12.5
38,400
23,000
35*
52
25
36
15
.7500-16
33,600
15,400
35*
58
25
41
20
44,800
23,800
35*
58
25
41
20
56,000
33,600
45*
78
35
54
25
.8750-14
45,800
12,600
50*
88
40
62
30
61,100
32,400
50*
88
40
62
30
76,400
45,800
70*
117
50
82
40
1.0000-14
61,100
16,800
70*
120
60
84
40
81,500
43,300
70*
120
60
84
40
101,900
61,100
90*
160
80
112
50
1.0000-12
59,700
16,400
70*
120
60
84
40
79,600
42,300
70*
120
60
84
40
99,500
59,700
90*
160
80
112
50
1.1250-12
76,900
21,200
75*
150
70
105
50
89,900
47,500
75*
150
70
105
50
128,000
76,800
100*
200
100
140
70
1.2500-12
96,600
26,600
85*
188
90
132
60
113,000
59,700
85*
188
90
132
60
161,000
96,600
110*
250
120
176
80
1.3750-12
118,000
32,500
100*
220
110
154
70
138,000
72,900
100*
220
110
154
70
197,000
118,000
135*
293
140
205
100
1.5000-12
142,000
39,100
110*
260
130
182
90
166,000
87,700
110*
260
130
182
90
237,000
142,000
150*
346
170
242
120
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