Fleetguard · HF Hydraulic · inline line

HF30121 filter element: specifications & equivalents

Q: What are the dimensions of the HF30121 filter element?

The published envelope is 99.31 mm OD × 468.12 mm length with a 45.85 mm inside diameter (3.910 × 18.430 in × 1.805 in ID). Confirm against the housing drawing before ordering.

The HF30121 is a Fleetguard inline-line hydraulic filter element, sized 99.31 × 468.12 mm OD × length (ID 45.85 mm). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 99.31 × 468.12 mm

Inside diameter 45.85 mm

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
Outside diameter OD	99.31 mm
Inside diameter ID	45.85 mm
Length	468.12 mm
End caps	open-ended cartridge element
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	HF30121
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	99.31 mm (3.910 in)
Inside diameter	45.85 mm (1.805 in)
Overall length	468.12 mm (18.430 in)

All 99×468 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 1HF42H6SLA000P page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1HF42H6SLA000P as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1HF42H6SLA000V page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1HF42H6SLA000V as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2060431 page in verification queue	UFI	partial	Fleetguard's online catalog lists 2060431 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2657803843 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2657803843 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2970L06B18 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2970L06B18 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2970L06V18 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2970L06V18 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 30143 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 30143 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3970GGEB18 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3970GGEB18 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3I2108 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3I2108 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50318D05BN page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50318D05BN as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 57677254 page in verification queue	UFI	partial	Fleetguard's online catalog lists 57677254 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 57803843 page in verification queue	UFI	partial	Fleetguard's online catalog lists 57803843 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 57889	WIX Filters	partial	Fleetguard's online catalog lists 57889 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6100EAL062N2 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 6100EAL062N2 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 7628658 page in verification queue	UFI	partial	Fleetguard's online catalog lists 7628658 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 7889 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 7889 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84889 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 84889 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 925799 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 925799 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 925799Q page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 925799Q as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 932678Q	Parker	partial	Fleetguard's online catalog lists 932678Q as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 9700186UM page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 9700186UM as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 9700EAL062N2 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 9700EAL062N2 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ A912513 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists A912513 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AFPOVL61046 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AFPOVL61046 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BEK1806A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BEK1806A as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ C925799 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists C925799 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D651G06A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D651G06A as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D651G06AV page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D651G06AV as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ DBH6020 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists DBH6020 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ DE4051B5C05 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists DE4051B5C05 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ DTHF4188UM page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists DTHF4188UM as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ E4051B6C05 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists E4051B6C05 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H2K005BN page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H2K005BN as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H9718MCBL page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H9718MCBL as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC9700FCN18H	Pall	partial	Fleetguard's online catalog lists HC9700FCN18H as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC9700FDN18H page in verification queue	Pall	partial	Fleetguard's online catalog lists HC9700FDN18H as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC9700FKN18H	Pall	partial	Fleetguard's online catalog lists HC9700FKN18H as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC9700FUN18H page in verification queue	Pall	partial	Fleetguard's online catalog lists HC9700FUN18H as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF4100HFV page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF4100HFV as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF42L5VQ page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF42L5VQ as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HPKL1806MB page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists HPKL1806MB as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HPKL186MB page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists HPKL186MB as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HPKL186MV page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists HPKL186MV as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ KKS10 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists KKS10 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ KKS3 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists KKS3 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ KKS3V page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists KKS3V as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ KKZ5	Schroeder Industries	partial	Fleetguard's online catalog lists KKZ5 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ KKZ5V	Schroeder Industries	partial	Fleetguard's online catalog lists KKZ5V as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ MF0059514 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists MF0059514 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ MP11499 page in verification queue	MP Filtri	partial	Fleetguard's online catalog lists MP11499 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ MP4403 page in verification queue	MP Filtri	partial	Fleetguard's online catalog lists MP4403 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P1556275 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P1556275 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P174247 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P174247 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P566275	Donaldson	partial	Fleetguard's online catalog lists P566275 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P97100HFV page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P97100HFV as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PLU3861000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PLU3861000 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PPL9700186GB page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PPL9700186GB as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PPL9700186GV page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PPL9700186GV as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PRU386200 page in verification queue	Parker	partial	Fleetguard's online catalog lists PRU386200 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT23515-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists PT23515MPG as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT9487-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists PT9487MPG as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ RF4H1810A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists RF4H1810A as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH87202 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH87202 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ TTK183B page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists TTK183B as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ TTK186B page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists TTK186B as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ TTK186V page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists TTK186V as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ U386 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists U386 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ V4051B6C05 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists V4051B6C05 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ V4051B6V05 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists V4051B6V05 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ V4051V6C05	Eaton / Internormen	partial	Fleetguard's online catalog lists V4051V6C05 as an interchange for HF30121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ V4051V6V05 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists V4051V6V05 as an interchange for HF30121. 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 HF30121 model number is decoded

HF30121Fleetguard HF-series hydraulic cartridge element part number.
468.12 mmOverall height.
99.31 mmLargest outside diameter.
45.85 mmLargest end inside diameter.

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).
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 HF30121 filter element?

The published envelope is 99.31 mm OD × 468.12 mm length with a 45.85 mm inside diameter (3.910 × 18.430 in × 1.805 in ID). Confirm against the housing drawing before ordering.

What replaces the HF30121 filter element?

71 partial match(es) requiring parameter review

How do I read the HF30121 part number?

See the designation decoder above: each segment of HF30121 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 3 catalog element(s) share the 99×468 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

HF30318 Fleetguard HF30595 Fleetguard HF30805 Fleetguard

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.