ISO 9001:2008

Carburize, Harden and Straighten of Transmission Gear and Spline Products

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Superior Heat Treat LLC can carburize and harden your shafts requiring straightening to tight tolerances for any case depth and hardness requirement specified. Our approach couples optimized fixturing screens and load building techniques with variable speed control of the quench cycle to meet your stringent specifications. Parts are straightened in a fashion that minimizes the opportunity for case cracks and virtually eliminates the use of localized heat for consistent hardness throughout the part. Many techniques requiring localized heat can lead to soft spots and torch cracking. These product lines and other carburized shafts requiring straightening is "power alley" stuff for Superior Heat Treat. Click to enlarge
Carburize, Harden and Straighten of Transmission Gear and Spline Products
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Project Specifications

Product Lines

  • Gear Shafts
  • Spline Shafts
  • Gear Pump Shafts
  • Transmission Components
  • Input Shafts


  • Carburize and Harden
  • Carbonitriding


  • Carburizing Grades (8620, 9310, 4320, 4820, 1018, 1020, 12L14)
  • Alloy Steels

Industries Served

  • Automotive
  • Hydraulic Pump
  • Military
  • Mining
  • Food Processing
  • Farm Equipment

Equipment List and Size Capabilities

  • 6 Internal Quench Ipsen Furnaces (Max Size at 36" x 36" x 48")
  • 10 Tempering Furnaces (Max Size at 48" x 48" x 48")
  • 1 Salt Bath (Max Size at 21" diameter x 30")

Industry Standards/Certifications

  • ISO 9001:2008 Registered
  • MIL-H-6088

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