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Rotary Retort Furnaces for Continuous Heat Treating of Small Parts

This 30-minute webinar, targeted directly at fastener manufacturers, will introduce a NEW ONLINE CALCULATOR that will help you accurately calculate the cost per pound of processing your fasteners in a high efficiency rotary retort furnace. Compare this number with your current $/lb whether it be from your current in-house mesh belt system or from your local commercial heat treater.

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SECO/WARWICK Corporation's rotary retort furnaces are specifically designed for continuous production and uniform heating treating of small parts, such as coins, small hardware, nails, bearings, chain components, and fasteners, such as nuts, bolts and screws.

SECO/WARWICK's rotary retort furnace is the perfect solution for continuous heat treating of small parts

The SECO/WARWICK rotary retort furnace is designed to improve production and maintain the consistent heat treating and quench performance required in high performance small parts like bearings and fasteners. It provides the process flexibility to be utilized for either single or multi-application production environments and in small or large batches. SECO/WARWICK customers are choosing Rotary Retort systems to save time and money in maintenance and operating costs when evaluating the total cost of ownership compared to traditional mesh belt or batch systems.


  • Annealing
  • Carbonitriding
  • Carburizing
  • Hardening
  • Stress Relieving
  • Tempering


  • Alloy steels
  • Carburizing grades
  • Stainless steels
  • Tool steels
  • Specialty steels & alloys
  • Titanium & titanium alloys


  • Bearings
  • Coins
  • Fasteners
  • Wide variety of other small hardware parts

Stand-alone or Modular Approach  

The rotary retort furnace can be built as a stand-alone hardening or annealing furnace with its metering loader and integral quench system, or part of a full harden-quench and draw line with furnace, washer(s), atmosphere generator(s), analyzers, etc. The system is designed for floor level installation, eliminating any need for pits or foundations and operates without any belt conveyors from the hopper through the quench.


  • Multiple standard furnace sizes to meet your production needs 
  • Temperature range: 1,550 to 1,750˚F (840 to 955˚C) 
  • Electric or Gas Design: The electric design features bayonet elements removable from outside of the furnace. The gas-fired design is equipped with cast alloy radiant tubes 
  • The cantilevered, one-piece cast retort has no seals or bearings in hot areas or at the discharge end, extending mechanical life 
  • Rotary mechanism conveys parts smoothly and quietly through the furnace 
  • Center port in rear allows the operator to view inside the retort and workload 
  • For maintenance, a removable roof provides heating chamber access

Whirl-A-Way QuenchTM

  • Provides superior quench results after parts have reached temperature 
  • Quench fluid can be oil, water or synthetic media 
  • Designed to prevent atmosphere contamination in the furnace 
  • A pressurized chamber generates more fluid velocity for faster quench

Hopper Loader 

  • Designed to automatically charge a predetermined load on each retort revolution

Furnace Options:  

  • Continuous mesh belt draw furnaces available for added capacity 
  • Endothermic gas generators 
  • Dewpoint or carbon analyzers for constant monitoring and control  


  • Continuous Work Flow for Low Production Costs 
  • Atmosphere Integrity Maintained 
  • Quick Easy Installation 
  • Consistent Heat Treating 
  • Integrated Quench 
  • Long Furnace Life