DH Series

Thermal Transfer Products Copper Tube and Fin Mobile Hydraulic Oil Coolers

API Heat Transfer’s full line of Thermal Transfer Products standard mobile oil coolers is proven to stand-up in some of the toughest off-road environments. Our oil coolers are available with a wide variety of standard options to best suit each application and offer maximum performance.

Copper Tube and Fin Product Highlights

  • Aluminum or Steel fins available
  • Up to +100 HP of heat removal from hydraulic oil
  • Cost effective, industry proven designs
  • Large range of standard sizes

Standard Product Options

  • 12 or 24 volt DC fans
  • Hydraulic fan motor drive
  • Built-in pressure bypass (30 or 60 psi for cold start-up)
  • Heresite coating for offshore or corrosive environment operation

Customer Focused and Driven

  • All catalog product is available with short lead-times 
  • Expert application engineers available to select and size the right product for your application 
  • Custom designs are available

Industry Applications

Our oil coolers are used in a wide variety of mobile applications across the globe.

  • Commercial duty lawnmowers
  • Municipal street cleaners
  • Hydrostatic drives
  • Tow-behind compressor lube cooling
  • Construction equipment
  • Underground mining
  • Engine oil cooling

For application help and quoting, visit our Full TTP site or contact ttpsales@apiheattransfer.com.

Contact Us/Request a Quote


  • Fluid Power
Ratings ASME-CodeMaximum Operating Pressure 300 PSI
Maximum Operating Temperature 350°F
MaterialsTubes - Copper
Fins - Aluminum / Steel
Turbulators - Aluminum
Manifolds - Copper (DH-051 – DH-447), Steel (DH-513 – DH-670)
Connections - Brass (DH-051 – DH-447), Steel (DH-513 – DH-670)

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