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XSelector® Sizing Program
Use our online portal or our mobile apps to size products to help achieve optimum performance for your application.
BOL Series
Air-Cooled Heat Exchangers for Hydraulic Oil Cooling in Industrial Power Units
Product Type
Heat Exchanger
Solution
Hydraulic Oil Cooling
Application
Industrial Applications
Technology
Air Cooled, Brazed Aluminum
Air-Cooled Brazed Aluminum Oil Coolers for Industrial & Hydraulic Systems
The Thermal Transfer Products BOL/BOLR Series is an industrial air-cooled hydraulic oil cooler built on a brazed aluminum bar-and-plate core. It delivers outstanding heat dissipation for extreme heat loads in a rugged, lightweight, and compact package, making it well suited to hydraulic power units, hydraulic presses and industrial machinery, and gearbox and lube-oil cooling circuits where high thermal loads run continuously.
Every unit uses TTP’s proven brazed aluminum core engineered with an aggressive turbulator that produces ultra-high heat transfer per envelope size. Coolers are available with AC or hydraulic fan motors, and TTP’s exclusive T-BAR™ extruded-tube cores are offered for high-viscosity oils and highly fouling fluids to reduce pressure drop.
Two internal bypass options — pressure bypass or temperature/pressure bypass — protect the core and improve cold-start performance. Because the bypass is internal, it eliminates extra external piping, which lowers installed cost and helps the cooler come out of bypass faster on cold starts. A low-noise option runs the motor at reduced speed for sound-sensitive installations.
The series covers a heat-rejection range from 5 HP (4 kW) to 630 HP (465 kW), with a maximum operating pressure of 250 PSI and maximum operating temperature of 350°F. TTP’s XSelector® sizing program — available online and as an Apple and Android app — helps optimize cooler selection for performance and value.
Consult catalog for additional sizes and technical information.
Product Features
- Bar and Plate Brazed Aluminum Core technology
- Provides the best heat transfer per given envelope size while minimizing pressure drop
- Air-side fin design minimizes fouling and static pressure ensuring long-term, reliable performance
- Welded fittings/ports and manifolds ensure structural integrity
- Standard SAE ports – NPT & BSPP available
- Low Noise versions offer reduced speed motors for lower dBA levels
- Customized units are available to meet your OE specific performance requirements
- T-BAR core optional for high viscosity oils or other highly fouling fluids (See T-BAR Performance Curve)
- Optional internal pressure and temperature/pressure bypass
Applications
The BOL Series air-cooled hydraulic oil coolers are ideal for:
- Hydraulic Power Units – maintain stable oil temperature and extend system life
- Hydraulic Presses and Industrial Machinery – manage high thermal loads during continuous operation
- Gearbox and Lube Oil Cooling Circuits – reduce viscosity breakdown and ensure consistent performance
- Performance Range: 5 HP (4 kW) to 630 HP (465 kW) heat rejection
| Ratings | |
|---|---|
| Maximum Operating Pressure | 250 PSI |
| Maximum Operating Temperature | 300°F |
| Heat Rejection | From 5–550 HP (4–410 kW) |
| Flow Rate | 2–350 GPM (7–1325 lpm) |
| Materials | |
|---|---|
| Mounting Feet | Steel |
| Core | Aluminum |
| Fanguard | Steel |
| Connectors | Aluminum |
| Fan | Aluminum Hub, Plastic Blades |
| Shroud | Steel |
| Configuration | |
|---|---|
| Fluid Compatability | Petroleum/mineral oils Oil/water emulsion Water/ethylene glycol |
| Connections | Standard SAE Ports (NPT & BSPP available) |
| Product Options | |
|---|---|
| Connection options | SAE NPT BSPP |
| Low noise | |
| T-BAR core | |
| Serviceable internal pressure and thermal/pressure bypass | |
- All catalog product is available with short lead-times
- Expert application engineers are available to select and size the right product for your application
- XSelector® is a great tool for optimizing the sizing of TTP coolers. Check out the Apple and Android app stores to download the XSelector®App.
- Our distributor One Status portal allows for on demand quoting of coolers and looking up order status.
- Custom designs are available
* To register for XSelector®please go to www.thermaltransfer.com/get-in-touch/ and complete the XSelector® Inquiry form and submit.
Download the XSelector®for both Apple and Android formats by searching for XSelector®in their App Stores. You must first register for XSelector®before using it on mobile devices.
Documents
Brochures
BOL/BOLR Series
Brochures
MAR/BOLR Bypass Sell Sheet
Brochures
BOL/BOLR Accessories
Technical
BOL Technical Information
Frequently Asked Questions
It’s an industrial air-cooled hydraulic oil cooler from Thermal Transfer Products, built on a brazed aluminum bar-and-plate core that cools oil using ambient air rather than water.
Hydraulic power units, hydraulic presses and industrial machinery, and gearbox and lube-oil cooling circuits — applications with high, continuous thermal loads where reducing oil viscosity breakdown matters.
The series spans a heat-rejection range from 5 HP (4 kW) up to 630 HP (465 kW), with a maximum operating pressure of 250 PSI and maximum operating temperature of 350°F.
T-BAR™ extruded-tube cores are designed for high-viscosity oils and highly fouling fluids, reducing pressure drop compared with the standard bar-and-plate core.
Two internal bypass options — pressure bypass, or temperature/pressure bypass. Because the bypass is internal, it eliminates extra external piping (lowering installed cost) and helps the cooler come out of bypass faster during cold starts.
AC or hydraulic fan motors, with a low-noise option that runs the motor at reduced speed for sound-sensitive environments.
Configure the BOL Series
3D Configurator
Our 3D Product Configurator will allow you to build up the cooler with specific options that are required for your application, view what you have created in 3D, then download the model directly into your format to complete your modeling project.
Talk to an engineer at TTP.
Finding the right thermal management solution shouldn’t be a guessing game. Whether you need a quick price quote, technical specs, or a fully custom engine cooling system designed from the ground up, our team is ready to help.
Fill out the form below, and one of our application engineers will reach out to ensure your equipment stays cool under pressure.