|
|
|
Look to
as "The Source."
|
|
|
Provided
links give access to illustrations and/or additional information.
To return to this page use your browser back button.
|
|
API Spec17D Recommended Torque
For Flange Bolts and Nuts
With Fluoropolymer Coating |
|
See
Caution Below |
| |
|
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 |
1-1/4 |
23,530 |
160 |
24,538 |
167 |
|
7/8 - 9 UNC |
1-7/16 |
32,483 |
253 |
33,937 |
264 |
|
1 - 8 UN |
1-5/8 |
42,614 |
376 |
44,522 |
393 |
|
1-1/8 - 8 UN |
1-13/16 |
55,608 |
539 |
58,098 |
564 |
|
1-1/4 - 8 UN |
2 |
70,330 |
744 |
73,478 |
777 |
|
1-3/8 - 8 UN |
2-3/16 |
86,777 |
994 |
90,662 |
1,038 |
|
1-1/2 - 8 UN |
2-3/8 |
104,951 |
1,294 |
109,650 |
1,352 |
|
1-5/8 - 8 UN |
2-9/16 |
124,852 |
1,649 |
130,442 |
1,723 |
|
1-3/4 - 8 UN |
2-3/4 |
146,480 |
2,063 |
153,038 |
2,155 |
|
1-7/8 - 8 UN |
2-15/16 |
169,833 |
2,541 |
177,438 |
2,654 |
|
2 - 8 UN |
3-1/8 |
194,914 |
3,087 |
203,642 |
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 |
7,284 |
360,772 |
7,611 |
|
* |
Torque ft lbs calculated to give % of
yield tension stress for ASTM A-193 B7 or
ASTM A-302 L7 bolts using ASTM
A 194 GR. 2H nuts. |
|
** |
Calculated based on reduced yield
strength of 95,000 psi. |
|
|
|
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.
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.
|
Information above, and in other
parts of this Web Site, may help persons who really seek to know. If you
have a question, and you think WOODCO USA may have the capacity to answer
it, please use our
Contact Us link and give us a
chance to help.
WOODCO USA
provides Web Site Tools for identification, estimating, and
reference only. Do not use this information for manufacturing or
inspection. Users of these tools should not use them as a
substitute for professional engineering advice. Anyone making use of the information
presented does so at his own risk and assumes any and all liability resulting from such
use.
FOR FURTHER INFORMATION, OR TO LEARN MORE ABOUT WOODCO
USA PRODUCTS AND SERVICES,
CONTACT:
WOODCO
USA
P.O. Box 1261
Houston, Texas 77251-1261
Phone: 713-672-9491
USA and Canada: 1-800-496-6326
Fax: 713-672-8768
www.woodcousa.com
 |
|
