Donaldson · FPK 03/04 · pressure line

P171745 filter element: specifications & equivalents

The P171745 is a Donaldson pressure-line hydraulic filter element, built with synteq synthetic media, standard-collapse execution media, rated at 23 µm absolute (β23(c) ≥ 1000 per ISO 16889 (Donaldson “B23” cartridge grade)). Verify against the current manufacturer data sheet before ordering.

Filtration rating 23 µm abs.

Beta rating β 23(c) ≥ 1000 per ISO 16889 (Donaldson “B23” cartridge grade)

Media Synteq synthetic media, standard-collapse execution

Line type pressure

Partially verified. Fit and grade trace to an official interchange document; dimensional values are compiled from 0 aftermarket listing(s) and must be confirmed against the manufacturer housing drawing. Confidence score 0.82.

Element length is taken from the FPK housing dimension table (column L); element OD/ID are not printed on this catalog page and are pending extraction from the dedicated element dimension table. Verify against the current Donaldson data sheet before ordering.

Specification table

Parameter	Value
Filter type	pressure line
Media	Synteq synthetic media, standard-collapse execution
Filtration rating	23 µm
Rating basis	absolute
Beta ratio	β23(c) ≥ 1000 per ISO 16889 (Donaldson “B23” cartridge grade)
Length	395 mm
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	P171745
Source catalog	Donaldson Company: Donaldson Hydraulic Filters eCatalog
Last verified	2026-09-27

Sources: Donaldson Company — Donaldson Hydraulic Filters eCatalog — accessed 2026-09-26.

Donaldson® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized Donaldson distributor.

Cross references & equivalents

No catalog-verified cross references yet. This model is in the manual verification queue — request a verified equivalent.

Interchange levels: full catalog-confirmed drop-in · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the P171745 model number is decoded

P171745Donaldson FPK cartridge element part number for the AP365 housing family (element family AP455).
B23Media grade: 23 µm at βx(c) ≥ 1000 per ISO 16889.
standard-collapseStandard-collapse execution (P1717xx range).

Typical equipment & applications

Pressure-line hydraulic filters upstream of control valves
High-differential-pressure industrial hydraulic circuits
Hydraulic power units for steel, paper and power generation

Selection pitfalls — read before you substitute

“10 µm nominal” and “12 µm at β1000” can describe the very same media — one is reported at β≥200, the other at β≥1000 per ISO 16889. Compare ratings at the same Beta test point, not just the printed micron number.
Nitrile (NBR) seals are standard for mineral hydraulic oil but fail early in some phosphate-ester fluids and at sustained high temperature; verify seal compound against the fluid data sheet (fluorocarbon/Viton executions may be required).
End-cap geometry and the number/position of O-rings block interchange even when OD and length match — visually compare end caps before fitting, especially with aftermarket cartridges.

Frequently asked questions

What micron rating does P171745 use?

This element is rated 23 µm absolute — β23(c) ≥ 1000 per ISO 16889 (Donaldson “B23” cartridge grade). Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

What replaces the P171745 filter element?

Cross references are being verified for this model — use the inquiry form and the engineering desk will confirm equivalents.

How do I read the P171745 part number?

See the designation decoder above: each segment of P171745 encodes size, line type, filtration grade and media/collapse execution.

Is a same-envelope aftermarket element always a drop-in replacement?

No. Matching OD and length only proves the cartridge fits the bowl. End-cap style, seal compound, micron/Beta rating, collapse pressure and bypass configuration must also match; the table above tags every equivalent as full, partial or verify for exactly this reason.

How often should a hydraulic return-line element be replaced?

Replace at the housing manufacturer’s recommended differential-pressure setting (commonly signalled by a clogging indicator), or on a time-based service interval when no indicator is fitted — never wait for bypass to open continuously, because unfiltered oil then reaches the valves.

Other models in the FPK 03/04 series

All 36 →

P171731 8 µm P171732 11 µm P171733 23 µm P171734 8 µm P171735 11 µm P171736 23 µm P171737 8 µm P171738 11 µm P171739 23 µm P171740 8 µm

Reviewed & verified by the ElementRef engineering desk against Donaldson Company on 2026-09-27. Read our editorial & correction policy.