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Flange Reference Chart API6A/B 1 13/16"
Torque values shown on this page apply only to API Spec 6A and 16A designated flanges, for surface applications
- .For make-up torque for Fluoropolymer coated B7/L7 bolts and 2H nuts, see details Fluoropolymer Coated Bolts below.
- Refer to 17D Torque Chart on table 17D below.
- When using 6BX Flanges for Subsea Applications see table below (6BX/17D) of this document for important notes.
|
Flange Size
|
Ring Gasket
|
Number of Bolts
|
Stud Bolt
|
Tap End Stud
|
Wrench Size
|
Torque* Ft. Lbs.
|
Nm
|
|
1-13/16" 10M
|
BX-151
|
8
|
3/4" x 5-1/2"
|
3/4 x 3-3/4"
|
1-1/4"
|
200
|
271,16 |
|
1-13/16" 10M
6BX TO 17SV
|
BX-151 SBX-151
|
8
|
3/4" x 6-1/2"
|
3/4 x 4-3/4"
|
1-1/4"
|
see table below
|
see table below |
|
1-13/16" 15M
|
BX-151
|
8
|
7/8" x 6"
|
7/8" x 4-1/8"
|
1-7/16"
|
319
|
432,505 |
|
1-13/16" 20M
|
BX-151
|
8
|
1" x 7-3/4"
|
1" x 5-1/8"
|
1-5/8"
|
474
|
642,65 |
Torque Values for API Spec 6A Flanges Using Fluoropolymer Coated Bolts For Surface Applications
These torques assume undamaged bolts, clean conditions and smooth bearing surfaces. The torque values shown in this table will apply 50% yield tension in the bolts.
1
|
Stud
Diameter
|
5/8"
|
3/4"
|
7/8"
|
1"
|
1-1/8"
|
1-1/4" *
|
1-3/8" *
|
1-1/2" *
|
1-5/8" *
|
1-3/4"
|
1-7/8"
|
|
Torque
Ft. Lbs.
|
68
|
118
|
188
|
279
|
401
|
553
|
739
|
962
|
1,226
|
1,534
|
1,890
|
|
Torque
Nm
|
92,19
|
159,98
|
254,89
|
378,27
|
543,68
|
748,41
|
1001,94
|
1304,29
|
1662,23
|
2079,82
|
2562,49
|
2
|
Stud
Diameter
|
2"
|
2-1/4"
|
2-1/2"
|
2-5/8"
|
2-3/4"
|
3"
|
3-1/4"
|
3-3/4"
|
3-7/8"
|
4"
|
|
Torque
Ft. Lbs.
|
2.297
|
3,276
|
4,500
|
4,716
|
5,424
|
7,047
|
8,965
|
13,782
|
15,208
|
16,730
|
|
Torque
Nm
|
3114,31
|
4441,65
|
6101,18
|
6394,03
|
7353,95
|
9554,44
|
12154,90
|
18685,88
|
20619,27
|
22682,83
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- Certain API Spec. 6A flanges have stress limits that necessitate lower than normal torque values
for bolts used in these flanges. Use the chart below for these flanges.
The torque values shown in this table will apply 40,000 psi stress in the bolts.
|
Flange
Size
|
13-5/8" 2M
|
13-5/8" 3M
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16-3/4" 2M
|
21-1/4" 2M
|
|
Stud
Diameter
|
1-1/4"
|
1-3/8"
|
1-1/2"
|
1-5/8"
|
|
Torque
Ft. Lbs.
|
421
|
563
|
733
|
934
|
|
Torque
Nm
|
570,79
|
763,32
|
993,81
|
1266,33
|
Torque Values for 17D and 6BX Flange Bolts for Subsea Applications
For Flange Bolts and NutsHaving Fluoropolymer Coating
|
Bolt Size
|
Hex Nut Size Across Flats
|
Minimum 67%
Yield Stress *
|
Maximum 70%
Yield Stress *
|
|
Bolt Tension
lbf
|
Make up Torque
ft lbs
|
Bolt Tension
lbf
|
Make up Torque
ft lbs
|
|
3/4 - 10 UNC
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1-1/4
|
23,530
|
160
|
24,538
|
167
|
|
7/8 - 9 UNC
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1-7/16
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32,483
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253
|
33,937
|
264
|
|
1 - 8 UN
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1-5/8
|
42,614
|
376
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44,522
|
393
|
|
1-1/8 - 8 UN
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1-13/16
|
55,608
|
539
|
58,098
|
564
|
|
1-1/4 - 8 UN
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2
|
70,330
|
744
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73,478
|
777
|
|
1-3/8 - 8 UN
|
2-3/16
|
86,777
|
994
|
90,662
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1,038
|
|
1-1/2 - 8 UN
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2-3/8
|
104,951
|
1,294
|
109,650
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1,352
|
|
1-5/8 - 8 UN
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2-9/16
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124,852
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1,649
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130,442
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1,723
|
|
1-3/4 - 8 UN
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2-3/4
|
146,480
|
2,063
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153,038
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2,155
|
|
1-7/8 - 8 UN
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2-15/16
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169,833
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2,541
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177,438
|
2,654
|
|
2 - 8 UN
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3-1/8
|
194,914
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3,087
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203,642
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3,225
|
|
2-1/4 - 8 UN
|
3-1/2
|
250,256
|
4,402
|
261,461
|
4,599
|
|
2-1/2 - 8 UN
|
3-7/8
|
312,504
|
6,044
|
326,497
|
6,315
|
|
2-3/4 - 8 UN**
|
4-1/4
|
345,310
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7,284
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360,772
|
7,611
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|
3 - 8 UN**
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4-5/8
|
414,127
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9,443
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432,670
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9,866
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3-1/4 - 8 UN**
|
5
|
489,194
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12,013
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511,098
|
12,551
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CAUTION: API Spec 17D requires flange connection bolt tightness (tension stress in the bolt) equal to 67% to 70% of the specified minimum yield strength of L7/B7 bolts. Operators should limit these higher tensions to only subsea flange connections that use BX or SBX ring gaskets and have designs that will allow face to face make-up. When using some lubricants and/or anti- corrosion coatings on bolts, tightening bolts consistent with the torque table shown above may in fact produce tension closer to the actual yield strength of the bolts. Operators should use an alternate method to measure tension in the bolts to confirm the applicability of this table.
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