To Order Call: 800-817-3486 or Email: or Fill a Contact Form

Heaters, Sensors, Controllers, Relays, Linear Displacement, and Leadwire

Bolt Cartridge Heater Manufacturer

Standard Lead Times


Bolt Heaters are constructed with one of the industry’s most efficient and highest quality heating elements—Hi-Density (swaged) Cartridge Heaters; with close tolerance fits, watt densities of 100 watts per square inch are obtainable – 65% higher than standard cartridge or tubular heating elements can deliver. The higher wattage on Hi-Density Bolt Heaters means quicker heat-up time and minimum heat loss to the area surrounding the bolt.

Bolt heaters are manufactured with a wooden handle attached to a terminal conduit box for easy insertion and removal.

Design Features:

  • Hi-Density Construction
  • Conduit Box with Knockouts
  • Wooden Handle
  • High Temperature Lead Wires – 250°C (482°F)
  • Optional SJO Cord or Post Terminals
  • Optional Quick Disconnect Plugs
Industries & Applications
Typical Industries:
  • Boiler Manufacturers
  • Construction
  • Large Machine and Die Manufacturers
  • Power Plants
  • Shipyards
Typical Applications:
  • Large Compressors
  • Turbines
  • Die Blocks
  • Large Cylinders
  • Engine Heads
  • Pressure Vessels
Diameters & Tolerances
Actual Diameter (in)0.4380.4960.5530.6210.6600.7100.7450.8130.993
Actual Diameter (mm)11.112.614.015.816.818.018.920.725.2

Diameter Tolerance: ±.005 (.127 mm)
Length Tolerance: ±2% of sheath length
Camber Tolerance: .020″ (0.38 mm) per foot of length

Standard Products
PictureTypeMax TempNotes
MGT 1000°C1832°F / 1000°CFlexible, Not Waterproof
MGT 750°C1382°F / 750°CFlexible, Not Waterproof
Duraflex1022°F / 550°CFlexible, Not Waterproof
MGT842°F / 450°CFlexible, Not Waterproof
TGGT482°F / 250°CDurable, Flexible, Not Waterproof
Teflon500°F / 260°CAbrasion Resistant, Small OD, Waterproof
Silicone Rubber355°F / 180°CVery Flexible, Waterproof, Easy to Nick
SEW2392°F / 200°CVery Flexible, Fair Abrasion Resist, Waterproof
End Seal Options
TypeMax TempMoisture ProtectionContaminant ProtectionMech. StrengthVibration Resist.
Ceramic2500°F 1371°CPoorPoorExcellentExcellent
Teflon300°F 149°CExcellentExcellentVery GoodExcellent
Lava3000°F 1649°CPoorGoodGoodPoor
Cement Potting1800°F 982°CPoorFairGoodPoor
Epoxylite Potting650°F 343°CFairVery GoodVery GoodExcellent
Epoxy Potting265°F 129°CGoodGoodExcellentExcellent
Silicone Rubber500°F 260°CExcellentExcellentFairExcellent