39
TORQUE VALUES FOR BOLT
TABLE 1
TORQUE VALUES FOR TUBE NUTS
(FOR 37° FLARED FITTINGS)
SIZE
TUBING
O.D.
THREAD
SIZE
TORQUE N m TORQUE Ft-lbs
MIN. MAX. MIN. MAX.
4
5
6
8
10
12
14
16
20
24
32
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
2
7/16-20
1/2-20
9/16-18
3/4-16
7/8-14
1-1/16-12
1-3/16-12
1-5/16-12
1-5/8-12
1-7/8-12
2-1/2-12
13.6
20.3
33.9
54.2
61.0
101.7
128.8
155.9
203.4
271.2
406.7
27.1
33.9
47.5
61.0
101.7
128.8
155.9
196.6
244.0
338.9
474.5
10
15
25
40
55
75
95
115
150
200
300
20
25
35
55
75
95
115
145
180
250
350
TABLE 3
TORQUE VALUES FOR O-RING BOSS
PLUGS, JIC 37° SEAT, SWIVEL NUTS
TABLE 2
FITTING AND ADAPTOR
THREAD DATA
Size Thread
Symbol Size
2 5/16-24
3 3/8-24
4 7/16-20
5 ½-20
6 9/16-18
8 ¾-16
10 7/8-14
12 1-1/16-12
14 1-3/16-12
16 1-1/16-12
20 1-1/8-12
24 1-7/8-12
32 2-1/2-12
TABLE 4
BOLT
SIZE
GRADE 5
MIN. MAX.
N m Ft-lbs N m Ft-lbs
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
1-1/2
1-3/4
2
12
26
43
71
108
156
217
298
583
854
1152
1726
5423
8541
13559
9
19
33
53
80
115
160
290
420
630
850
1200
2000
3300
5000
14
28
50
81
122
176
244
434
637
963
1288
1830
5830
9084
14236
10
21
37
60
90
130
180
320
470
710
950
1350
2300
3700
5500
S.A.E.
GRADE
BOLT IDENTIFICATION CHART
DESCRIPTION
BOLT HEAD
MARKING
1
or
2
WILL HAVE NO RADIAL LINES
Low or Medium Carbon Steel Not
Heat Treated
5
WILL HAVE 3 RADIAL LINES
Quenched and Tempered Medium
Carbon Steel
8
WILL HAVE 6 RADIAL LINES
Quenched and Tempered Special
Carbon or Alloy Steel
SIZE
TORQUE N m TORQUE Ft-lbs
MIN. MAX MIN. MAX.
4
5
6
8
10
12
14
16
20
24
32
8.1
13.6
20.3
33.9
47.5
81.4
94.9
108.5
128.8
162.7
338.9
13.6
20.3
27.1
40.7
54.2
94.9
108.5
122.0
155.9
189.8
406.7
6
10
15
25
35
60
70
80
95
120
250
10
15
20
30
40
70
80
90
115
140
300
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