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Fleetguard · HF Hydraulic · inline line

HF29091 filter element: specifications & equivalents

The HF29091 is a Fleetguard inline-line hydraulic filter element, built with microglass media, sized 152.4 × 296.7 mm OD × length (ID 78.2 mm), rated at 4 µm absolute (4 µm at β75(c); 4 µm at β200(c); 5 µm at β1000(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 152.4 × 296.7 mm
Inside diameter 78.2 mm
Filtration rating 4 µm abs.
Beta rating 4 µm at β75(c); 4 µm at β200(c); 5 µm at β1000(c) per ISO 16889
Media Microglass
Line type inline
Catalog verified. Parameters extracted from the manufacturer’s electronic catalog / official interchange document and checked 2026-09-28. Confidence score 0.90.

Specifications and cross-references are taken from the Fleetguard online catalog API. Where both TWA and Beta ratings are published the conventions differ — verify cleanliness targets, collapse rating and seal configuration against the current Fleetguard data sheet before ordering.

Specification table

ParameterValue
Filter type inline line
Media Microglass
Filtration rating 4 µm
Rating basis absolute
Beta ratio 4 µm at β75(c); 4 µm at β200(c); 5 µm at β1000(c) per ISO 16889
Outside diameter OD 152.4 mm
Inside diameter ID 78.2 mm
Length 296.7 mm
End caps open-ended cartridge element
Rated flow 28.37 L/min
Integral bypass valve none (housing/valve-dependent)
Manufacturer part no. HF29091
Source catalog Cummins Filtration / Fleetguard: Fleetguard online product catalog (fleetguard.com)
Last verified2026-09-28

Sources: Cummins Filtration / Fleetguard — Fleetguard online product catalog (fleetguard.com) — accessed 2026-09-28.

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

Dimensions & series range

Outside diameter152.4 mm (6.000 in)
Inside diameter78.2 mm (3.079 in)
Overall length296.7 mm (11.681 in)

Cross references & equivalents

Equivalent modelBrandMatch levelNote
↔ 3400403
page in verification queue
UFIpartialFleetguard's online catalog lists 3400403 as an interchange for HF29091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P579006
page in verification queue
DonaldsonpartialFleetguard's online catalog lists P579006 as an interchange for HF29091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.

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 HF29091 model number is decoded

  • HF29091Fleetguard HF-series hydraulic cartridge element part number.
  • 296.7 mmOverall height.
  • 152.4 mmLargest outside diameter.
  • 78.2 mmLargest end inside diameter.
  • 4 µm at β75(c); 4 µm at β200(c); 5 µm at β1000(c) per ISO 16889Published efficiency ratings.

Typical equipment & applications

  • Construction, agricultural and industrial hydraulic circuits
  • Mobile-equipment hydraulic return and pressure lines

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).
  • Fine 4 µm media loads faster and runs at a higher cold Δp than coarser grades — only downgrade cleanliness targets if the system ISO 4406 code allows it.
  • 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 are the dimensions of the HF29091 filter element?
The published envelope is 152.4 mm OD × 296.7 mm length with a 78.2 mm inside diameter (6.000 × 11.681 in × 3.079 in ID). Confirm against the housing drawing before ordering.
What micron rating does HF29091 use?
This element is rated 4 µm absolute — 4 µm at β75(c); 4 µm at β200(c); 5 µm at β1000(c) per ISO 16889. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.
What replaces the HF29091 filter element?
2 partial match(es) requiring parameter review
How do I read the HF29091 part number?
See the designation decoder above: each segment of HF29091 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 HF Hydraulic series

All 2621 →
HF28084 HF28086 HF28088 HF28201 HF28202 97×247 mm HF28652 HF28658 95×193 mm HF28660 HF28662 HF28667

Reviewed & verified by the ElementRef engineering desk against Cummins Filtration / Fleetguard on 2026-09-28. Read our editorial & correction policy.