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Torque values for four-bolt flange connections (Inch Screws, Grade 8)
Metric size
Imperial size
mm
13
19
25
32
38
51
64
76
89
102
127
Tapered thread connection tightening
British Standard Pipe Taper
(BSPT) thread size (inch)
1/8-28
1/4-19
3/8-19
1/2-14
3/4-14
1-11
1-1/4-11
1-1/2-11
2-11
Torque values for banjo bolt connections (Copper washer style)
Bolt thread (metric)
M8 x 1.25
M10 x 1.25
M12 x 1.5
M14 x 1.5
M16 x 1.5
M18 x 1.5
M20 x 1.5
M22 x 1.5
M24 x 1.5
INTRODUCTION
Screw code
in
61
1/2
5/16-18
3/4
3/8-16
1
3/8-16
1-1/4
7/16-14
1-1/2
1/2-13
2
1/2-13
2-1/2
1/2-13
3
5/8-11
3-1/2
5/8-11
4
5/8-11
5
5/8-11
National Pipe Thread Fuel
(NPTF) thread size (inch)
Hex size (mm)
47998488 17/03/2016
Code 61
N·m (lb ft)
± 10 %
34 (25.1)
63 (46.5)
63 (46.5)
97 (71.5)
158 (116.5)
158 (116.5)
158 (116.5)
310 (228.6)
310 (228.6)
310 (228.6)
310 (228.6)
1/8-27
1/4-18
3/8-18
1/2-14
3/4-14
1-11 1/2
1-1/4-11 1/2
1-1/2-11 1/2
2-11 1/2
13
17
17
19
22
24
27
32
32
27
Code 62
Screw code
N·m (lb ft)
62
± 10 %
5/16-18
34 (25.1)
3/8-16
63 (46.5)
7/16-14
97 (71.5)
1/2-13
158 (116.5)
5/8-11
310 (228.6)
3/4-10
473 (348.9)
–
–
–
–
–
Turns from finger tight
2 - 3
2 - 3
2 - 3
2 - 3
2 - 3
1.5 - 2.5
1.5 - 2.5
1.5 - 2.5
1.5 - 2.5
Torque N·m (lb ft) ± 10 %
13 (9.6)
16 (11.8)
40 (29.5)
45 (33.2)
48 (35.4)
50 (36.9)
73 (53.8)
73 (53.8)
73 (53.8)
–
–
–
–
–
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