Fleetguard · HF Hydraulic · inline line

HF30921 filter element: specifications & equivalents

Q: What are the dimensions of the HF30921 filter element?

The published envelope is 79.5 mm OD × 419.99 mm length with a 49.15 mm inside diameter (3.130 × 16.535 in × 1.935 in ID). Confirm against the housing drawing before ordering.

Q: What micron rating does HF30921 use?

This element is rated 3 µm (nominal class) — TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(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.

The HF30921 is a Fleetguard inline-line hydraulic filter element, sized 79.5 × 419.99 mm OD × length (ID 49.15 mm), rated at 3 µm class (TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 79.5 × 419.99 mm

Inside diameter 49.15 mm

Filtration rating 3 µm nom.

Beta rating TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(c) per ISO 16889

Collapse / burst 13.79 bar

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

Parameter	Value
Filter type	inline line
Filtration rating	3 µm
Rating basis	nominal
Beta ratio	TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(c) per ISO 16889
Outside diameter OD	79.5 mm
Inside diameter ID	49.15 mm
Length	419.99 mm
End caps	open-ended cartridge element
Rated flow	184.7 L/min
Collapse / burst pressure	13.79 bar
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	HF30921
Source catalog	Cummins Filtration / Fleetguard: Fleetguard online product catalog (fleetguard.com)
Last verified	2026-09-28

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 diameter	79.5 mm (3.130 in)
Inside diameter	49.15 mm (1.935 in)
Overall length	419.99 mm (16.535 in)

All 80×420 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 3960ZGHB16 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3960ZGHB16 as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 94485 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 94485 as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AK3572 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AK3572 as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P580356 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P580356 as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PB9666 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PB9666 as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT8495-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists PT8495MPG as an interchange for HF30921. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT8495-MPG	Baldwin Filters	partial	Baldwin's Form 561 Number-Finder cross-reference lists HF30921 (FLEETGUARD) as replaced by Baldwin PT8495-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting.
↔ SH87660 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH87660 as an interchange for HF30921. 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 HF30921 model number is decoded

HF30921Fleetguard HF-series hydraulic cartridge element part number.
419.99 mmOverall height.
79.5 mmLargest outside diameter.
49.15 mmLargest end inside diameter.
TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(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 3 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 HF30921 filter element?

The published envelope is 79.5 mm OD × 419.99 mm length with a 49.15 mm inside diameter (3.130 × 16.535 in × 1.935 in ID). Confirm against the housing drawing before ordering.

What micron rating does HF30921 use?

This element is rated 3 µm (nominal class) — TWA 3 µm at β=2; 10.1 µm at β75(c); 11.5 µm at β200(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 HF30921 filter element?

8 partial match(es) requiring parameter review

How do I read the HF30921 part number?

See the designation decoder above: each segment of HF30921 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.

Same-envelope elements from other brands

View full interchange →

These 4 catalog element(s) share the 80×420 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

HF30918 Fleetguard · 0.8 µm HF30920 Fleetguard · 1 µm HF30922 Fleetguard · 3 µm HF30924 Fleetguard · 5 µm

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.