nOMinAL PiPE
DiAMETEr
nUMBEr OF BOLTS
BOLT DiAMETEr
TOrQUE
in.
mm
Ft-lbs
N•m
1
4
0.50
12.70
9
12.20
1-1/4
4
0.50
12.70
13
17.63
1-1/2
4
0.50
12.70
18
24.40
2
4
0.63
16.00
35
47.45
2-1/2
4
0.63
16.00
41
55.59
3
4
0.63
16.00
60
81.35
3-1/2
8
0.63
16.00
34
46.10
4
8
0.63
16.00
43
58.30
6
8
0.75
19.05
80
108.5
8
8
0.75
19.05
109
147.8
10
12
0.88
22.4
101
136.9
12
12
0.88
22.4
135
183.0
14
12
1.00
25.0
168
227.8
16
16
1.00
25.0
159
215.6
18
16
1.13
28.7
244
330.8
20
20
1.13
28.7
214
290.2
24
24
1.25
31.8
253
343.0
Assumptions: Use of SAE grade 5 bolts or studs or stronger.
No lubricant.
Compressed mineral fiber material or similar.
Notes: If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table.
For best results hardened steel washers should be used on all cast flange bolted connections.
Table 6.
Torque Values for Raised Face Connection Flange (Steel Only)
nOMinAL PiPE DiAMETEr
nUMBEr OF BOLTS
BOLT DiAMETEr
TOrQUE
in.
mm
Ft-lbs
N•m
1
4
0.50
12.70
14
18.98
1-1/4
4
0.50
12.70
16
21.69
1-1/2
4
0.50
12.70
18
24.41
2
4
0.63
16.00
32
43.39
2-1/2
4
0.63
16.00
43
58.30
3
4
0.63
16.00
47
63.72
3-1/2
8
0.63
16.00
26
35.25
4
8
0.63
16.00
32
43.39
6
8
0.75
19.05
49
66.44
8
8
0.75
19.05
68
92.20
10
12
0.88
22.4
69
93.55
12
12
0.88
22.4
98
132.9
14
12
1.00
25.0
138
187.1
16
16
1.00
25.0
125
169.5
18
16
1.13
28.7
142
192.5
20
20
1.13
28.7
135
183.0
24
24
1.25
31.8
156
211.5
8 API
16
0.50
12.70
20
27.12
20 API
16
0.63
16.00
75
101.7
24 API
20
0.63
16.00
75
101.7
Assumptions: Use of SAE grade 5 bolts or studs or stronger.
No lubricant.
Elastomer <70 Durometer Shore A.
Notes: Flat faced flanges should never be mated to a raised face flange for installation.
If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table.
For best results hardened steel washers should be used on all cast flange bolted connections.
Table 7.
Torque Values for Flat Face Connection Flange (Steel or Aluminum)
DESCriPTiOn
COEFFiCiEnT OF FriCTiOn
MULTiPLY TOrQUE VALUE in TABLE 6 BY
Machine Oil
f = 0.15
0.75
API SA2 Grease
f = 0.12
0.60
Nickel-based Lubricant
f = 0.11
0.55
Copper-based Lubricant
f = 0.10
0.50
Heavy-Duty Lubricating Paste
f = 0.06
0.30
Table 8.
Torque Correction Factors for Common Lubricants Applied on Flanges
10
Enardo DFA Series
Outside North
America Only
