ElementRef

HYDAC · Betamicron 4 R · return line

0500 R 003 ON /-KB filter element: specifications & equivalents

The 0500 R 003 ON /-KB is a HYDAC return-line hydraulic filter element, built with on=optimicron low-press. media, sized 94 × 276.9 mm OD × length (ID 48 mm), rated at 3 µm absolute (ßx(c) ≥ 1000 (HYDAC grade convention: β5(c) ≥ 1000)). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 94 × 276.9 mm
Inside diameter 48 mm
Filtration rating 3 µm abs.
Beta rating ßx(c) ≥ 1000 (HYDAC grade convention: β5(c) ≥ 1000)
Media ON=Optimicron low-press.
Collapse / burst 20 bar
Line type return
Catalog verified. Parameters extracted from the manufacturer’s electronic catalog / official interchange document and checked 2026-09-28. Confidence score 0.92.

Dimensions, ratings and seal compound are taken directly from the HYDAC electronic catalog (catalog.hydac.com). Outside diameter and length are converted from the inch values printed on the catalog page; verify against the current HYDAC data sheet before ordering.

Specification table

ParameterValue
Filter type return line
Media ON=Optimicron low-press.
Filtration rating 3 µm
Rating basis absolute
Beta ratio ßx(c) ≥ 1000 (HYDAC grade convention: β5(c) ≥ 1000)
Outside diameter OD 94 mm
Inside diameter ID 48 mm
Length 276.9 mm
End caps open-ended cartridge element
Flow direction outside-in
Collapse / burst pressure 20 bar
Integral bypass valve none (housing/valve-dependent)
Seal material Nitrile (Buna-N)
Operating temperature -30 to 100 °C
Source catalog HYDAC Technology Corporation: HYDAC electronic product catalog (catalog.hydac.com)
Last verified2026-09-28

Sources: HYDAC Technology Corporation — HYDAC electronic product catalog (catalog.hydac.com) — accessed 2026-09-29.

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

Dimensions & series range

Outside diameter94 mm (3.701 in)
Inside diameter48 mm (1.890 in)
Overall length276.9 mm (10.902 in)

All 94×277 mm interchange elements →

Cross references & equivalents

Equivalent modelBrandMatch levelNote
↔ RE-130-G-03-B-NBSTAUFFpartialSTAUFF Filter Interchange lists 0500 R 003 ON /-KB (HYDAC) as replaced by RE-130-G-03-B-NB. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits.

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 0500 R 003 ON /-KB model number is decoded

  • 0500 R 003 ON /-KBHYDAC Type R filter element ordering code per the HYDAC electronic catalog (s16).
  • ON=Optimicron low-press.Filter media and collapse family as printed in the catalog.
  • 3 µmAbsolute filter rating per the HYDAC catalog.
  • ßx(c) ≥ 1000Beta ratio rating as printed in the catalog.
  • 94 mmOutside diameter.
  • 48 mmInner diameter.
  • 276.9 mmElement length.
  • 20 barElement collapse (differential pressure) rating.
  • Nitrile (Buna-N)Seal compound.

Typical equipment & applications

  • Return-line filtration for HYDAC RF/RFM and equivalent housings
  • Industrial and mobile hydraulic systems

Selection pitfalls — read before you substitute

  • A return-line element is not a pressure-line element: return cartridges (BN4HC low-collapse) tolerate roughly 20 bar differential, while BH4HC pressure executions are rated to 210 bar. Installing a low-collapse element in a pressure housing can rupture the media on cold-start spikes.
  • This element has no integral bypass — opening pressure is set by the housing’s reusable bypass valve. Confirm the valve setting (commonly 3.4 bar) is present before fitting.
  • “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 0500 R 003 ON /-KB filter element?
The published envelope is 94 mm OD × 276.9 mm length with a 48 mm inside diameter (3.701 × 10.902 in × 1.890 in ID). Confirm against the housing drawing before ordering.
What micron rating does 0500 R 003 ON /-KB use?
This element is rated 3 µm absolute — ßx(c) ≥ 1000 (HYDAC grade convention: β5(c) ≥ 1000). Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.
What replaces the 0500 R 003 ON /-KB filter element?
1 partial match(es) requiring parameter review
How do I read the 0500 R 003 ON /-KB part number?
See the designation decoder above: each segment of 0500R003ONKB 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 43 catalog element(s) share the 94×277 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

0210 R 005 ON HYDAC · 5 µm 0210 R 010 ON HYDAC · 10 µm 0210 R 015 MM HYDAC · 15 µm 0210 R 020 ON HYDAC · 20 µm 0500 R 003 BN4AM HYDAC · 3 µm 0500 R 003 ON HYDAC · 3 µm 0500 R 003 ON /-B6 HYDAC · 3 µm 0500 R 005 ON HYDAC · 5 µm 0500 R 005 ON /-B6 HYDAC · 5 µm 0500 R 005 ON /-SFREE HYDAC · 5 µm

Other models in the Betamicron 4 R series

All 929 →
0030 R 003 BN4HC 36×107 mm · 3 µm 0030 R 005 BN4HC 36×107 mm · 5 µm 0030 R 010 BN4HC 36×107 mm · 10 µm 0030 R 010 BN4HC /-B6 36×107 mm · 10 µm 0030 R 010 P/HC 36×107 mm · 10 µm 0030 R 010 P/HC /-B6 36×107 mm · 10 µm 0030 R 020 BN4HC 36×107 mm · 20 µm 0030 R 020 P/HC 36×107 mm · 20 µm 0030 R 025 W/HC 36×107 mm · 25 µm 0030 R 050 W/HC 36×107 mm · 50 µm

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