Donaldson
Donaldson P550921
The Donaldson P550921 is a 9µm synthetic hydraulic filter element. It measures 5.13" OD x 3.25" ID x 6.88" long. Filtration efficiency is rated at 1000 per ISO 16889. 3 verified cross-references are available from aftermarket manufacturers.
Request a Quote
Request a quote for this filter element.
3 Cross-References Available
See which OEM filters this product replaces.
What are the specifications of the Donaldson P550921?
Technical specifications for the Donaldson P550921 filter element. Data sourced from manufacturer catalogs and verified against OEM documentation.
| Specification | Value |
|---|---|
| Performance | |
| Micron Rating | 9µm |
| Media Type | Synthetic |
| Efficiency (ISO 16889) | 1000 |
| Dimensions | |
| O.D. (inches) | 5.13" |
| I.D. (inches) | 3.25" |
| O.A.L. (inches) | 6.88" |
Last verified: February 2026
What replaces the Donaldson P550921?
3 verified replacements available from FilterMart
All cross-references are reviewed for dimensional and performance compatibility. Enter your info below to receive the full cross-reference report.
Application & Compatibility
The DONALDSON P550921 is designed for use in hydraulic and lubrication filtration systems. With a 9µm rating, this element is suitable for proportional valve protection and general hydraulic systems.
Frequently Asked Questions
What micron rating is the Donaldson P550921?
What are the dimensions of the Donaldson P550921?
Is there a cross-reference for the Donaldson P550921?
Need help finding this filter?
We have 3 verified replacements on file. Enter your info and we'll send you the full cross-reference report within 24 hours.
Verified Cross-References
352,000+ verified filter specifications
Fast Response
Quotes and answers within 24 hours
Expert Support
Real filtration specialists, not call centers