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A bolted joint obtains its superior characteristics through proper clamping force on the gasket contact surfaces. The clamping force, or bolt load, is caused by correctly tensioned bolts. If the bolts have not reached required tension, there is insufficient clamping force and the joint is not up to specification. If excessive clamping force is used, the bolt, gasket and/or the flange may be damaged. In either case, a leak is the probable result. Therefore, it is imperative that the proper clamping force is achieved. Direct Tension Indicators provide the means to measure bolt tension (bolt load).