JN Machinery

Don’t kid around with STRESS relief!

With over 4400 ovens operating worldwide, JN has the expertise and experience to handle your stress relieving requirements.

JN’s electric conveyor ovens have mostly been used for heat treatment and stress relieving springs, especially for heat treating stainless steel and carbon steel wire. Another use is with JN’s TRC paint system.  However, there are virtually unlimited uses of our conveyor ovens beyond heat treating metal. Our conveyor ovens are also being used for rustproofing, tempering metal, baking, oiling, drying, and sterilization.

JN Machinery was founded in 1985 and currently has over 4400 furnaces in operation worldwide.

All of JN’s conveyor ovens are designed and built in our Chicago fabrication plant and has thrived on its original partners’ combined 95 years of experience in the Spring & Stamping Industry and relies on its newest partner’s extensive international business experience to offer the highest quality and most economically designed On-Line furnaces in the industry on a global scale.

The history of JN’s electric conveyor furnace began as a unit of North American Spring & Stamping Corporation in 1982. NASSCO developed conveyor furnaces for its own internal use, and the furnace had quite an impact on quality and productivity. JN Machinery Corporation was established as a new independent company in 1985 JN is a company born by a Spring Company, For Spring Companies.

JN Machinery has been instrumental in the development of and setting the standards for electric conveyor furnaces in the application of stress relieving springs and heat-treating metal. We have published numerous studies proving that in most applications, on-line, continuous heat treatment for springs is superior to the traditional batch method using large industrial ovens.

Therefore, JN has the capability to understand your stress-relieving needs, as well as the importance of a reliable and efficient manufacturing process.

JN was also the first company to develop and market an automated paint system called TRC (Tempering, Rustproofing, Color Coating). The paint system works with a special water-based polymer that will only bond to metal when it is >350`F(177`C). JN’s paint system utilizes the residual heat of the parts exiting the conveyor furnaces and immediately immerses the parts in the polymer. The result is that parts are coated and dried in approximately 2 minutes, all without additional labor.

Common Features on all JN ovens

  • Ceramic Fiber insulation
  • Vari-speed control (potentiometer or digital)
  • Incoloy sheath heating elements
  • Stainless steel heat shielded chamber
  • AC direct drive motor
  • Stainless steel tight mesh belt
  • Low energy consumption
  • Belt-reversing
  • Trouble Alarms
  • Stainless Steel mesh belts


JN Ovens Feature

  • Made in the USA
  • Digital speed controller
  • Insulated Belt Return
  • Belt Reversing
  • Digital Temperature Controls
  • Trouble Alarm
  • Low Maintenance
  • Digital Timers (option)

JN Ovens Advantage

  • Large Effective Heating Area
  • Small Total Floor Area
  • Fast Start-Up
  • Low Operating Cost
  • Economically Priced

On-Line Stress Relieving

  • Improved Quality
  • Increased Productivity
  • Low Energy Consumption
  • Reduce Variation on Loads & Dimensions
  • Facilitates CQI-9/AMS2750 & Other Data Needs