Nakai Bolt Heater for Industrial Use | Straight & Flexible Types

The Nakai Bolt Heater is an electric resistance heating tool designed for controlled thermal expansion of large-diameter bolts, studs, and tie rods during assembly and disassembly operations. By uniformly heating the fastener, the heater enables accurate preload application while reducing mechanical stress on flanges and joints. The unit is available in straight and flexible configurations to accommodate various installation geometries and access constraints. 

The heating element is housed within a durable metal body with integrated power cable and insulated grip for safe handling in industrial environments. Typical applications include turbine casing assembly, pressure vessel maintenance, and heavy rotating equipment overhaul. The heater supports repeatable heating cycles, contributing to consistent bolting quality and reduced risk of galling or thread damage. It is suitable for use in high-demand industrial sites where precise bolt tensioning and maintenance efficiency are required.