Bolt Heaters/Flexible Bolt Heaters

Heatrex has over thirty-five years experience in the design and manufacture of high quality bolt heaters. The Heatrex Bolt Heater is specifically designed to provide maximum watt density rating on the heated tube length. Heatrex uses the highest quality materials commonly available to manufacture these heaters and maintains rigid quality control procedures to insure a reliable product. Each heater is energized at rated voltage and electrically tested at full heat prior to shipment.

Applications

Heatrex Bolt Heaters are used to preheat large, hollow holding bolts or studs where a high concentration of heat is critical for bolt expansion in a short period of time. As an insertion type unit, the bolt heater is widely used in the manufacture and servicing of heavy duty steam or other pressure equipment. It is also used to heat die blocks and large platens and to expand adjusting bolts on mechanical or hydraulic presses.

Construction

• Alloy sheath swaged tubular construction
• Grade "A" magnesium-oxide filled and swaged
• 80/20 Nickel chrome alloy resistance wire
• Standard 4" octagon electrical enclosure, with knock-outs for easy wiring
• Insulating handle
• Wide range of standard (stock) diameters and lengths

Optional Features

• Special watt densities, wattages, lengths and diameters available
• Three conductor power leads and plug assemblies
• Two conductor power leads with grounding clip and plug assemblies
• Replaceable element bolt heaters feature cast boxes for convenient screw-in interchangeability
• Flexible Bolt Heaters available

Benefits

• Fast response, large bolts can be heated to full expansion in 15-30 minutes
• May be used in multiples, for uniform heating of matching bolts

Flexible Bolt Heaters

Applications

Heatrex Flexible Bolt Heaters are designed to allow easy access to stud bolts with overhead clearance restrictions. Heatrex Flexible Bolt Heaters incorporate a time proven design of 50 watts of heat per square inch. The flexible sheath allows the heater to be flexed or bent to almost any required configuration.

Construction

• Alloy sheath
• Element swaged to finished size
• Two high-temperature resistance wires
• Grade "A" magnesium-oxide insulation

Optional Features

• Three prong twist lock plug

Benefits

• A unique "Top Hat" design, retaining plug and cable, help with insertion while preventing unraveling of element.
• A special handle assembly incorporates a 90° offset, which increases the insertion clearance by 80%. allowing easy entry into studs with less than optimum clearance.

Special Sizes and Ratings are Available

Download Product Brochures