ElementRef

HYDAC · Betamicron 4 R · return line

3.1260 R 05 BNK4 /-KB filter element: specifications & equivalents

The 3.1260 R 05 BNK4 /-KB is a HYDAC return-line hydraulic filter element, built with bhk=only glass fibers-low collapse media, sized 116.8 × 602 mm OD × length (ID 59 mm), rated at 5 µm absolute (β5 > 1000 (HYDAC grade convention: β7(c) ≥ 1000)). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 116.8 × 602 mm
Inside diameter 59 mm
Filtration rating 5 µm abs.
Beta rating β 5 > 1000 (HYDAC grade convention: β7(c) ≥ 1000)
Media BHK=Only Glass Fibers-Low Collapse
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 0.90.

HYDAC Betterfit element — dimensions and ratings are taken from catalog.hydac.com. This is HYDAC's drop-in replacement for a Argo-Hytos 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

ParameterValue
Filter type return line
Media BHK=Only Glass Fibers-Low Collapse
Filtration rating 5 µm
Rating basis absolute
Beta ratio β5 > 1000 (HYDAC grade convention: β7(c) ≥ 1000)
Outside diameter OD 116.8 mm
Inside diameter ID 59 mm
Length 602 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 diameter116.8 mm (4.598 in)
Inside diameter59 mm (2.323 in)
Overall length602 mm (23.701 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 3.1260 R 05 BNK4 /-KB model number is decoded

  • 3.1260 R 05 BNK4 /-KBHYDAC Betterfit filter element ordering code per catalog.hydac.com. Replaces Argo-Hytos elements.
  • BHK=Only Glass Fibers-Low CollapseFilter media and collapse family as printed in the catalog.
  • 5 µmAbsolute filter rating per the HYDAC catalog.
  • 116.8 mmOutside diameter.
  • 602 mmElement length.
  • 20 barElement collapse (differential pressure) rating.
  • Nitrile (Buna-N)Seal compound.

Typical equipment & applications

  • HYDAC Betterfit drop-in replacement for Argo-Hytos 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).
  • 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 3.1260 R 05 BNK4 /-KB filter element?
The published envelope is 116.8 mm OD × 602 mm length with a 59 mm inside diameter (4.598 × 23.701 in × 2.323 in ID). Confirm against the housing drawing before ordering.
What micron rating does 3.1260 R 05 BNK4 /-KB use?
This element is rated 5 µm absolute — β5 > 1000 (HYDAC grade convention: β7(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 3.1260 R 05 BNK4 /-KB 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 3.1260 R 05 BNK4 /-KB part number?
See the designation decoder above: each segment of 31260R05BNK4KB 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 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.