VFVerifiedFilters

Donaldson

Donaldson P171821

Verified SourceAbsolute Rated
OD 4.18"L 18.31"ID 0.4"
Dimensional schematic
Micron
20µm
Media
MICROGLASS
O.D.
4.18"
I.D.
0.4"
Length
18.31"
Seal
BUNA
Efficiency
1000
Collapse
145 PSID

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2 verified cross-references — see what replaces this →
Part Number
P171821
Manufacturer
Donaldson

Donaldson P171821 specifications

The Donaldson P171821 is a 20µm microglass filter element. It measures 4.18" OD x 0.4" ID x 18.31" long. Filtration efficiency is rated at 1000 per ISO 16889. Seals are BUNA, rated for -13°F to 250°F. Collapse pressure rating is 145 PSID. 2 verified cross-references are available from aftermarket manufacturers. Specifications verified. Last reviewed: May 2026

Performance

Micron Rating
20µm
Media Type
MICROGLASS
Efficiency (ISO 16889)
1000
Collapse Rating
145 PSID
Flow Direction
INSIDE-OUT
Operating Temperature
-13°F to 250°F

Dimensions

O.D. (inches)
4.18"
I.D. (inches)
0.4"
O.A.L. (inches)
18.31"
Seal Material
BUNA

What replaces the Donaldson P171821?

2 verified cross-references on file. A cross-reference confirms dimensional fit and micron rating — not performance equivalence. Beta ratio, collapse rating, media, and service life can differ between brands.

Part NumberManufacturerMatch
HPTX2L18-25MBHy-ProVerified
SFTXW2-18-25UMSwift FiltersSourced
Get a quote on any of these →

Application & Compatibility

The DONALDSON P171821 is designed for use in hydraulic and lubrication filtration systems. With a 20µm rating, this element is suitable for pump and component protection in industrial hydraulic circuits. BUNA seals provide compatibility with standard petroleum-based fluids and mineral oils.

The 145 PSID collapse rating indicates the maximum differential pressure this element can withstand during cold starts or bypass conditions without structural failure. Ensure your system's maximum differential pressure does not exceed this rating.

Frequently Asked Questions

What micron rating is the Donaldson P171821?

The Donaldson P171821 has a 20µm micron rating with microglass filter media, rated at 1000 per ISO 16889.

What are the dimensions of the Donaldson P171821?

The Donaldson P171821 measures 4.18" OD, 0.4" ID, 18.31" overall length.

What seal material does the Donaldson P171821 use?

The Donaldson P171821 uses BUNA seals, rated for -13°F to 250°F.

Is there a cross-reference for the Donaldson P171821?

Yes. There are 2 verified cross-references for the Donaldson P171821 from manufacturers including Hy-Pro, Swift Filters. Contact VerifiedFilters for specific part numbers and availability.

What is the collapse pressure rating of the Donaldson P171821?

The Donaldson P171821 has a collapse pressure rating of 145 PSID. This indicates the maximum differential pressure the element can withstand without structural failure.

What is the operating temperature range for the Donaldson P171821?

The Donaldson P171821 is rated for -13°F to 250°F, determined by its BUNA seals.

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