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    The BNZ Series of water - oil coolers provide an efficient way to cool hydraulic fluid utilizing shell and tube technology. The design consists of an outer housing shell and a tube / fin bundle known as a “stack”, which fits inside the shell. Hydraulic fluid to be cooled is circulated through the housing shell and passes across the cooling fins which transfers the heat to the cooling tubes in the stack. Cooling fluid, being typically water or water-glycol, flows through the cooling tubes running through the stack to carry the absorbed heat away. This rugged design offers high heat removal in a compact package. A large variety of cooling capacity sizes, port options and material choices are available to tailor the optimum cooler to meet specific application needs. For more application information, refer to the “Application Guidelines” section.
Unit of Measure





N/A BNZ 80-361


N/A 4-Pass


N/A Temperature Control Unit

Max. Operating Pressure - Shell Side

N/A 580.00 psi40.00 bar


N/A Shell & Tube Technology


N/A To cool hydraulic fluid utilizing shell and tube technology

Oil Port

N/A SAE O-Ring


N/A 25.48 lb

Surface Area

N/A 22.80 ft²2.12 m²

UPC Number

N/A 3251

Tube Material

N/A Copper

Shell, Guide Plate, Brackets & Bypass Valve Material

N/A Steel

End Cover Material

N/A Cast Iron GG25

Fin Material

N/A Aluminum

Tube Sheet Material

N/A Steel

Gasket Material

N/A Flat Gaskets C4400

End Cap Material

N/A Cast Iron (Stainless Steel Optional)

Port Housing Material

N/A Cast Iron

Mounting Bracket Material

N/A Steel (May Be Rotated in 90 Degree Increments)

Shell Tube Material

N/A Welded Steel

Gasket Size

N/A C440 (Compatible with Fluids)

Drain Plug Material

N/A Steel

Dimensional Data

Oil Port Size

N/A 1-7/8-12 SAE O-Ring (-24)

Drain Plug (S)

N/A G 1/4

Test Port (T)

N/A G 1/4

Dimension A

N/A 14.210 in361.00 mm

Dimension B

N/A 3.580 in91.00 mm

Dimension C

N/A 3.580 in91.00 mm

Dimension D

N/A 9.020 in229.00 mm

Dimension E

N/A 16.060 in408.00 mm

Dimension F

N/A 17.830 in453.00 mm

Dimension G

N/A 2.600 in66.00 mm

Dimension H

N/A 0.710 in18.00 mm

Dimension I

N/A 2.990 in76.00 mm

Dimension J

N/A 0.430 in11.00 mm

Dimension K

N/A 5.120 in130.00 mm

Dimension L

N/A 3.700 in94.00 mm

Dimension M

N/A 5.000 in127.00 mm

Dimension N

N/A 5.470 in139.00 mm

Dimension O

N/A 2.600 in66.00 mm

Dimension P

N/A 2.870 in73.00 mm

Dimension R

N/A 1.730 in44.00 mm

Dimension S

N/A 2.090 in53.00 mm

Dimension T

N/A 1.380 in35.00 mm

Dimension U

N/A 3.540 in90.00 mm

Cubic inches

N/A 487.65050 in³

Performance Data

Max. Operating Pressure - Tube Side

N/A 230.00 psi


N/A 200.00 ºF95.00 ºC

Max. Flow Rate

N/A 59.00 gal/min225.00 L/min

BNZ Cooler Stacks

BNZ Cooler Stacks

  • Tubes with aluminum fins provide extended cooler surface for additional cooler capacity in a compact package
  • Aluminum fins are mechanically bonded to the tubes using a ube expansion process proprietary to Lovejoy
  • Baffle plates are added to provide flow restriction for routing hot oil for the proper number of cooling passes
  • Copper tubes are standard
    • Copper Nickel or Stainless Steel tubes optional

Optional Materials

Optional Materials

  • Tubes: Copper Nickel / Stainless Steel 1.4404 (AISI316L)
  • End Cover: Stainless Steel 1.4408 (AISI316)
  • Fins: Copper / Stainless Steel 1.4304 (AISI304)
  • Tube Sheet: Stainless Steel

Port Options

Port Options

  • SAE
  • NPT
  • BSPP



  • Compact size – "Shell and Tube Design"
  • Extended cooling surface
  • Low pressure drop – high efficiency
  • Heat removal up to 600 hp (500 kW)
  • Oil flow rates up to 225 GPM (850 l/min)
  • Removable end caps for easy cleaning
  • Close-tolerance port face locations
  • Interchangeable with Thermal Transfer EK series
  • 100% pressure tested, leak-free performance
  • Design flexibility
    • Three frame sizes to choose (BNZ 60, 80 and 125)
    • Customized lengths available
    • NPT, SAE, BSPP and flange port options
    • Mounting may be rotated in 90 degree increments
    • Optional materials for increased corrosion protection



  • Production tolerances for above dimensions above may vary by up to +/- .079 in (2mm).
  • BSPP Oil Ports only available with BSPP Coolant Ports
  • O-Ring, NPT and Flange Oil Ports only available with NPT Coolant Ports
  • Above models are with standard copper tubes, aluminum fins, standard black paint, and individually boxed
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