IPO washers – „orange“ tension indication

IPO washer „orange“ are special direct tension indicators with flexible silicone embedded in the depressions under the indicator protrusions. Select the right material (related to yield strength of the bolts), fit them under a nut face washer under the nut and tighten the assembly until after the orange silicone appears in volume from most of the IPO washerss squirt locations, stop tightening and that´s all there is to do. After the tightening just visually controll if all bolts are properly tightened.

Without any torque wrench, problems with lubrication....bolts are very presizelly tightened.

These IPO washers are recommended to be used in construction industry, steel constructions, bridges, industrial flanges, cranes....