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Collar bolts are a type of fastener that is extensively used to hold the bundle in the exact place for removable bundle heat exchangers. This ensures the channel removal without interrupting or breaking the seal between the shell and tube sheet.
Jack bolts or jack screws are long stud bolts that use tension to hold a part in place, or to jack up a part into position. They incorporate an hydraulic connection and use the hydraulic power to hold the part in place.
Square head bolts are used in applications where visibility is limited but durable fastening is required. These bolts have large, flat sides and are easy to tighten with a wrench. Square heads are best used in tight or dark spaces where a machinist or fabricator must tighten the bolt blind. It is simple to fit a tool over the square shape even when there are no visual markers available.
Hinge Bolts :