Bolt threads exposed to the elements or corrosive environments can rust or corrode which can cause routine maintenance to become very costly. Corrosive prevention caps and covers for nuts and bolts ensures routine torque maintenance on critical equipment (refineries,petrochemical plants, LNG plants, offshore platforms, steel structures). Commonly installed on heat exchangers, reactors and process equipment. Protective metal caps or covers are available to protect bolt thread and nut or just thread, they can be made in a wide range of materials (aluminium, carbon steel and stainless steel), imperial and metric. Custom caps manufactured to order.