HYDAC · Betamicron 4 R · return line
9.05.12MA20BN filter element: specifications & equivalents
The 9.05.12MA20BN is a HYDAC return-line hydraulic filter element, built with bn/hc=betamicron® low capacity media, sized 119.4 × 292.1 mm OD × length (ID 44.5 mm), rated at 20 µm absolute (ßx(c) ≥ 1000 (HYDAC grade convention: β22(c) ≥ 1000)). Verify against the current manufacturer data sheet before ordering.
HYDAC Betterfit element — dimensions and ratings are taken from catalog.hydac.com. This is HYDAC's drop-in replacement for a Donaldson element; the exact competitor part number is not published on the catalog page. Verify form/fit and micron grade against the competitor data sheet before substituting.
Specification table
| Parameter | Value |
|---|---|
| Filter type | return line |
| Media | BN/HC=Betamicron® Low Capacity |
| Filtration rating | 20 µm |
| Rating basis | absolute |
| Beta ratio | ßx(c) ≥ 1000 (HYDAC grade convention: β22(c) ≥ 1000) |
| Outside diameter OD | 119.4 mm |
| Inside diameter ID | 44.5 mm |
| Length | 292.1 mm |
| End caps | open-ended cartridge element |
| 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 verified | 2026-09-28 |
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 diameter | 119.4 mm (4.701 in) |
| Inside diameter | 44.5 mm (1.752 in) |
| Overall length | 292.1 mm (11.500 in) |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| ↔ HF6547 | Fleetguard | partial | Fleetguard's online catalog lists 90512MA20BN as an interchange for HF6547. 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 9.05.12MA20BN model number is decoded
- 9.05.12MA20BNHYDAC Betterfit filter element ordering code per catalog.hydac.com. Replaces Donaldson elements.
- BN/HC=Betamicron® Low CapacityFilter media and collapse family as printed in the catalog.
- 20 µmAbsolute filter rating per the HYDAC catalog.
- 119.4 mmOutside diameter.
- 292.1 mmElement length.
- 20 barElement collapse (differential pressure) rating.
- Nitrile (Buna-N)Seal compound.
Typical equipment & applications
- HYDAC Betterfit drop-in replacement for Donaldson hydraulic filter elements
- Return-line filtration for equivalent housings
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).
- 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 9.05.12MA20BN filter element?
What micron rating does 9.05.12MA20BN use?
What replaces the 9.05.12MA20BN filter element?
How do I read the 9.05.12MA20BN part number?
Is a same-envelope aftermarket element always a drop-in replacement?
How often should a hydraulic return-line element be replaced?
Other models in the Betamicron 4 R series
All 929 →Reviewed & verified by the ElementRef engineering desk against HYDAC Technology Corporation on 2026-09-28. Read our editorial & correction policy.