Bolt strength measurement of the PSI (pounds per square inch).shear connector PSI is applied to one square inch area from the force of one pound of force caused by pressure. Society of Automotive Engineers and ASTM International Group rates Strength Bolts, or numerical index (PSI).

Bolts of corrosive and high temperature environments are weakened. In addition, the bolt can carry a heavier load than its rating to lose its force. You can use one of several techniques to break the strength of the bolt.

A wrench to loosen and twist off bolts, hex nuts, or breaker bar. A nut thread of the bolt clamping force, and gives the greatest strength of the bolt. Simply remove the nuts and bolts will be greatly weakened.

Cut half of the bolt with a sawzall or angle grinder. hex structure bolts sawing or cutting head or bolt will completely break the strength of the bolts along the shank or thread.

2 applied to the weight of more than a bolt load of PSI rating. This pressure led to bolt fatigue. Determine the strength of the bolts marked by its head. The chart contains the bolt head tag and the PSI score is available online.

3, oxygen / acetylene torch burning bolts. Heat applied to the body of a bolt to change their physical composition and lead to bolt weaknesses.

4 environment, the location in the atmosphere containing a high proportion of fresh water or seawater bolts. Over time, oxidation will lead to weakness and failure of the bolt. In addition, high strength bolt the highly acidic environment will cause the bolt corrosion and lose strength.