ElementRef

Eaton / Internormen · 01.E / 01.N / Easy-Fit · inline line

344121 filter element: specifications & equivalents

The 344121 is a Eaton / Internormen inline-line hydraulic filter element, built with glass fiber fleece (vg) media, sized 142 × 503 mm OD × length, rated at 5 µm absolute. Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 142 × 503 mm
Filtration rating 5 µm abs.
Media Glass fiber fleece (VG)
Collapse / burst 10 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.

Specs come from Eaton's product data hub via its site-search API. The µm retention rating follows ISO 16889 (absolute convention), while the model-code fineness grade is nominal — match both before substituting.

Specification table

ParameterValue
Filter type inline line
Media Glass fiber fleece (VG)
Filtration rating 5 µm
Rating basis absolute
Outside diameter OD 142 mm
Length 503 mm
End caps open-ended cartridge element
Collapse / burst pressure 10 bar
Integral bypass valve none (housing/valve-dependent)
Seal material Nitrile (Buna-N)
Manufacturer part no. 344121
Source catalog Eaton: Eaton product data hub via site search API (eaton.com)
Last verified2026-09-28

Sources: Eaton — Eaton product data hub via site search API (eaton.com) — accessed 2026-09-29.

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

Dimensions & series range

Outside diameter142 mm (5.591 in)
Overall length503 mm (19.803 in)

All 142×503 mm interchange elements →

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 344121 model number is decoded

  • 344121Eaton 01.E Lubrication filter element model code (Eaton 01.E Lubrication Filter Element).
  • 344121Eaton catalog number (order code) for the same element.
  • 3 VGFilter fineness grade: nominal rating and media letter.
  • 5 µmISO 16889 multipass retention rating as published by Eaton.
  • Glass fiber fleece (VG)Filter media execution.
  • 10 barDelta-P resistance class — maximum differential pressure (collapse) rating.
  • Nitrile (Buna-N)Seal compound.
  • 142 mmOuter diameter.
  • 503 mmElement height.

Typical equipment & applications

  • Medium-pressure in-line and lubrication circuits
  • Spin-on and exchange element replacements

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 5 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 344121 filter element?
The published envelope is 142 mm OD × 503 mm length (5.591 × 19.803 in). Confirm against the housing drawing before ordering.
What micron rating does 344121 use?
This element is rated 5 µm absolute. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.
What replaces the 344121 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 344121 part number?
See the designation decoder above: each segment of 344121 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 60 catalog element(s) share the 142×503 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

01.E 1201.10API.10.E.P.- Eaton / Internormen · 10 µm 01.E 1201.10G.10.E.P.- Eaton / Internormen · 10 µm 01.E 1201.10G.10.E.V.VA Eaton / Internormen · 10 µm 01.E 1201.10P.10.S.P.- Eaton / Internormen · 10 µm 01.E 1201.10VG.10.E.P.- Eaton / Internormen · 10 µm 01.E 1201.10VG.10.E.P.IS06 Eaton / Internormen · 10 µm 01.E 1201.10VG.10.E.P.VA Eaton / Internormen · 10 µm 01.E 1201.10VG.10.E.V.- Eaton / Internormen · 10 µm 01.E 1201.10VG.10.E.V.VA Eaton / Internormen · 10 µm 01.E 1201.10VG.10.S1.P.- Eaton / Internormen · 10 µm

Other models in the 01.E / 01.N / Easy-Fit series

All 3329 →
01.1910.40G.16.E.O.SON 44×110 mm 01.20213.130G.E.O 102×202 mm 01.21657.25VG.10.B.N.IS09 140×459 mm 01.41542.25VG.16.B.N.IS09 90×558 mm · 20 µm 01.AS 180.250G.-.E.T.- 80×315 mm · 250 µm 01.AS 180.40G.-.E.T.- 80×315 mm · 40 µm 01.AS 180.80G.-.E.T.- 80×315 mm · 80 µm 01.AS 220.130G.-.B.-.- 79×274 mm · 130 µm 01.AS 220.250G.-.B.-.- 79×274 mm · 250 µm 01.AS 220.25G.-.B.-.- 79×274 mm · 25 µm

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