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HIF - Studs, Bolts, and Tightening

Bolt and Stud Requirements

Use bolts or studs of SAE Grade 5 or better steel with rolled threads. Flat Washers are to be used under bolt heads and nuts. To achieve maximum torque loads, it is recommended that a high temperature anti-seize lubricant be applied to the bolt/studs before torquing.

Bolt Torquing Procedures
  • Tighten initially to approximately 2/3 of final torque using the alternate and opposite method.
  • Tighten to the final torque shown in the table, again, using the alternate and opposite method.
  • Repeat tightening to the final torque shown at least twice to ensure that flanges are permanently set.
The final torque values should not be exceeded by more than 50%
 
Convert To Metric Units
Nominal
Size (in.)
# of bolts Bolt Dia. (in.) Bolt length
pipe to pipe
(passive to active)
Bolt length
fitting to fitting
(passive to active)
Initial torque (appox.)
(ft/lbs)
Final torque (minimum)
(ft/lbs)
1 4 1/2 2 3/4 3 1/2 25 40
1 1/2 3 1/2 4 35 50
2 5/8 3 1/2 4 1/2 50 80
3 4 4 3/4 70 110
4 8 4 1/2 5 1/4 60 90
6 3/4 5 1/2 6 1/2 85 130
8 6 7 1/2 100 150

Tightening Sequence

4 Bolts or Nuts


8 Bolts or Nuts

Note: When using studs rather than bolts, increase the length sufficiently to allow for the additional length of a nut


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