Tighten bolts in a star or criss-cross sequence to ensure even pressure distribution around the flange. Always start with a bolt and move across the bolt circle to tighten the next bolt. Such an effec...
HOME / Connector box diagonal tightening sequence - SMB AI-Systems & High-Speed Interconnect
Connector box diagonal tightening sequence - SMB AI-Systems & High-Speed Interconnect [PDF]
(a) Tighten nuts twice in a criss-cross pattern using a torque wrench. The first time nut is torqued, apply approximately 75 percent of the final torque value. (b) Repeat the sequence a second time until 100
Get Quote
Based on experience, if the bolts are in a circular pattern, a criss-cross tightening sequence would normally be specified. For non-circular bolt patterns, a spiral sequence starting at the middle would
Get Quote
For proper ANSI flange bolt tightening, follow a sequential “star” or criss-cross pattern, tightening bolts in stages to ensure even gasket compression and a secure, leak-free connection.
Get Quote
With such a sequence, each bolt is tightened more than once to help reduce the preload reduction caused by tightening the other bolts in the joint. Tests have shown that the elastic
Get Quote
Two classical examples of tightening sequences are shown below, one for a rectangular array of bolts and the other, a circular array. Such sequences have been shown to result in providing a reasonably
Get Quote
The different steps required to perform a correct tightening of the joint based on ASME PCC-1 are indicated below. We have selected this standard instead of the European norm to develop this
Get Quote
pattern tightening sequence for the number of bolts below. Starting at the #1 bolt, use the appropriate cross-pattern tightening sequence for Rounds 1, 2, and 3 (each sequence constitutes a "Round").
Get Quote
Based on experience, if the bolts are in a circular pattern, a criss-cross tightening sequence would normally be specified. For non-circular bolt patterns, a spiral
Get Quote
Diagonal Pattern: Bolts are tightened diagonally, starting from one bolt and moving diagonally to the opposite side. This pattern effectively maintains even pressure on the flange.
Get Quote
Following the “diagonal-symmetry” rule, tighten the remaining bolts outward from the middle. Bolts on the same diagonal apply forces in opposite directions, cancelling stresses and preventing housing
Get Quote
The numbers do not have to be followed exactly; however, the diagonal tightening patterns should be followed. By using proper torque and the illustrated sequence patterns, sealing problems from
Get Quote