ElementRef

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

361991-FILT filter element: specifications & equivalents

The 361991-FILT is a Eaton / Internormen inline-line hydraulic filter element, built with stainless steel wire mesh (g) media, sized 102 × 159 mm OD × length, rated at 149 µm absolute. Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 102 × 159 mm
Filtration rating 149 µm abs.
Media Stainless steel wire mesh (G)
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 Stainless steel wire mesh (G)
Filtration rating 149 µm
Rating basis absolute
Outside diameter OD 102 mm
Length 159 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. 361991-FILT
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 diameter102 mm (4.016 in)
Overall length159 mm (6.260 in)

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 361991-FILT model number is decoded

  • 361991-FILTEaton 50FB Vickers filter element model code (Eaton 50FB Vickers In-Line Filter Element).
  • 361991-FILTEaton catalog number (order code) for the same element.
  • 149 µmFilter fineness grade: nominal rating and media letter.
  • 149 µmISO 16889 multipass retention rating as published by Eaton.
  • Stainless steel wire mesh (G)Filter media execution.
  • 10 barDelta-P resistance class — maximum differential pressure (collapse) rating.
  • Nitrile (Buna-N)Seal compound.
  • 102 mmOuter diameter.
  • 159 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).
  • 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 361991-FILT filter element?
The published envelope is 102 mm OD × 159 mm length (4.016 × 6.260 in). Confirm against the housing drawing before ordering.
What micron rating does 361991-FILT use?
This element is rated 149 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 361991-FILT 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 361991-FILT part number?
See the designation decoder above: each segment of 361991FILT 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 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.