Replacement for Nuovo RFO31139 Hydraulic Filter Element
$34.50
Engineered filtration that provides OEM reliability—at an excellent value.
Proudly Made in America with ISO certified manufacturing, SONA’s direct replacement for the Nuovo RFO31139 element offers trusted performance and engineered quality, all while fitting seamlessly into your existing system.
Free Shipping is available on orders of $500 or more for this product.
LIVE UPS or LTL rates calculated on the checkout page

SONA Nuovo RFO31139 Replacement Filter
Our Nuovo RFO31139 replacement hydraulic filter is a guaranteed direct replacement in form, fit, and function. This means the filter will fit and you should expect performance to be equal to or greater than the OEM filter. Made in America.
Filtration Media for the Nuovo RFO31139 direct interchange
Our filter media is backed by ISO 16889 multi-pass testing and other ISO/SAE test protocols and the filter is produced in an ISO Certified manufacturing facility. An ISO Certified manufacturing facility is all about quality control, consistency, responsibility, and being true to the design. Optimized microglass media is used for fine filtration, just like the Nuovo RFO31139 hydraulic filter to be replaced. Our microglass filters use the optimal amount of media and pleats to ensure high dirt-holding capacity. The correct number and design of pleats in the element will give you the lowest initial pressure drop. Therefore the filter will take longer to reach its change-out pressure drop which is usually 25 PSID.
Micron Rating for the Nuovo RFO31139 cross
This Nuovo RFO31139 hydraulic filter replacement element is beta-rated. The filter performance is outstanding. The Beta X = 1000 number means that for every 1000 particles of x size in the fluid only one particle will pass through the filter on average.
- 20 Micron; B20 = 200, B26.6 = 1000 equivalent to efficiency of 99.9%
Filter Collapse Pressure for the Nuovo RFO31139 cross reference
A filter collapse pressure of 305 PSID Collapse means that if the filter is completely clogged and the build up of pressure reaches or surpasses 305 PSID Collapse the filter may collapse and allow contamination downstream. Please use a satisfactory safety factor for the filter.
Compatible Fluids
This filter is compatible with the following fluids but pressure drop will vary depending on viscosity and temperature:
- Hydraulic Fluid and Machining Fluids
- Diesel and other fuels
- Lubricating Oils and Synthetic Lubricants
- Turbine and Compressor Lube Oils … And many more fluids
Visit the links below for more helpful information.
Our hydraulic filter is indicated as a replacement for Nuovo RFO31139 and is not manufactured by or affiliated with the OEM or Brand listed. Part numbers and names are used for cross reference only. The element may vary from the image displayed on the left.







Replacement for OMT CHP282GXN Hydraulic Filter Element
Replacement for Triboguard 980046UM Hydraulic Filter Element
Replacement for Hydac 2060601 Hydraulic Filter Element
Replacement for Taisei Kogyo PLND-06-10U Filter Element
Replacement for Hydac 0280D020BN4HC Hydraulic Filter Element
Replacement for Zinga WE-518-25 Hydraulic Filter Element
Replacement for Schroeder 5TBZ5 Hydraulic Filter Element
Replacement for Separation Technologies 3980GGMB08 Hydraulic Filter Element
Replacement for OMT CR171F10R Hydraulic Filter Element
Replacement for Vickers V4051B7C05 Hydraulic Filter Element
Replacement for Separation Technologies H060D25WHC Hydraulic Filter Element
Replacement for Separation Technologies 3910GGEV04 Hydraulic Filter Element
Replacement for Separation Technologies ST1758 Hydraulic Filter Element
Replacement for Separation Technologies ST1587 Hydraulic Filter Element
Replacement for Separation Technologies H280D03H Hydraulic Filter Element
Replacement for Swaploader 20P66 Spin-On Filter 