Thermalfold Bolt Heaters
Thermalfold Bolt Heaters
Thermalfold Bolt Heaters are used as an aid to tighten large bolts in heavy machinery and equipment.
When inserted into a drilled hole in the bolt, the Thermalfold Bolt Heater rapidly heats the bolt, causing expansion and increasing the bolts length. This allows the nut to be further tightened. When the heater is switched o and removed, the bolt begins to cool and contracts to its original length, ensuring an extra tightened assembly.
Thermalfold Bolt Heaters are of a unique design and can be used in holes which have been drilled up to 0.5mm larger than the bolt heater diameter. When energised, the elements heat up and spring open due to their folded construction. This ensures a quick heat transfer to the bolt. While in the heated condition they are a snug -t and impossible to remove. On cooling, Thermalfold Bolt Heaters contract back to their original diameter and become very easy to remove. Conventional bolt heaters will fail under these conditions. A roll compacted high grade stainless steel construction enables a maximum heater temperature of 600°C giving a faster heat up time, with minimum heat transfer or loss to the area surrounding the bolt.
Bolt heaters are used in industries such as building and construction, boiler manufacturing, power plants, mining, shipyards, large machine and die manufacturers. Typical applications include large compressors, turbines, pressure vessels, steam generators, engine heads, large cylinders and die blocks.
To contact Vulcanic Thermal Electric Elements about Thermalfold Bolt Heaters use Get a quote.
When inserted into a drilled hole in the bolt, the Thermalfold Bolt Heater rapidly heats the bolt, causing expansion and increasing the bolts length. This allows the nut to be further tightened. When the heater is switched o and removed, the bolt begins to cool and contracts to its original length, ensuring an extra tightened assembly.
Thermalfold Bolt Heaters are of a unique design and can be used in holes which have been drilled up to 0.5mm larger than the bolt heater diameter. When energised, the elements heat up and spring open due to their folded construction. This ensures a quick heat transfer to the bolt. While in the heated condition they are a snug -t and impossible to remove. On cooling, Thermalfold Bolt Heaters contract back to their original diameter and become very easy to remove. Conventional bolt heaters will fail under these conditions. A roll compacted high grade stainless steel construction enables a maximum heater temperature of 600°C giving a faster heat up time, with minimum heat transfer or loss to the area surrounding the bolt.
Bolt heaters are used in industries such as building and construction, boiler manufacturing, power plants, mining, shipyards, large machine and die manufacturers. Typical applications include large compressors, turbines, pressure vessels, steam generators, engine heads, large cylinders and die blocks.
To contact Vulcanic Thermal Electric Elements about Thermalfold Bolt Heaters use Get a quote.
Thermalfold Bolt Heaters are electric elements inserted into drilled holes to heat and expand large bolts, allowing their nuts to be tightened further. Their folded construction springs open when energised, creating close contact with the bolt for quick heat transfer. Power plants can use them on turbines, while stainless steel construction limits heat transfer to areas around the bolt.
- Holes can be drilled up to 0.5 mm larger than the heater diameter
- Heaters cannot be removed while hot
- Cooling returns heaters to their original diameter for easy removal
- Maximum heater temperature: 600°C
- Applications include large compressors, pressure vessels, steam generators, engine heads and large cylinders
Source: listing by Vulcanic Thermal Electric Elements on IndustrySearch · Updated 2 Nov 2026
AI Overview is generated by artificial intelligence and may contain mistakes.
Written by AI from the listing by Vulcanic Thermal Electric Elements on IndustrySearch. It is meant to use only what that listing says, but it can still get details wrong, so check them with the supplier before you buy.
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