Filtrec · Filtrec elements · inline line

WP559 filter element: specifications & equivalents

Q: What are the dimensions of the WP559 filter element?

The published envelope is 232 mm OD × 172 mm length with a 170 mm inside diameter (9.134 × 6.772 in × 6.693 in ID). Confirm against the housing drawing before ordering.

Q: What micron rating does WP559 use?

This element is rated 25 µm (nominal class) — β25(c)≥2. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

The WP559 is a Filtrec inline-line hydraulic filter element, built with cellulose media, sized 232 × 172 mm OD × length (ID 170 mm), rated at 25 µm class (β25(c)≥2). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 232 × 172 mm

Inside diameter 170 mm

Filtration rating 25 µm nom.

Beta rating β 25(c)≥2

Media cellulose

Line type inline

Catalog verified. Parameters extracted from the manufacturer’s electronic catalog / official interchange document and checked 2026-10-03. Confidence score 0.90.

Dimensions and media grade are taken from Filtrec’s official Cross Navigator, which maps this element to specific competitor part numbers. Filtrec does not publish collapse pressure or seal compound in this API for every code — verify collapse rating, seal execution and bypass setting against the current Filtrec data sheet for the target housing before ordering.

Specification table

Parameter	Value
Filter type	inline line
Media	cellulose
Filtration rating	25 µm
Rating basis	nominal
Beta ratio	β25(c)≥2
Outside diameter OD	232 mm
Inside diameter ID	170 mm
Length	172 mm
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	WP559
Source catalog	Filtrec S.p.A.: Filtrec Cross Navigator
Last verified	2026-10-03

Sources: Filtrec S.p.A. — Filtrec Cross Navigator — accessed 2026-10-03.

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

Dimensional drawing

Reference drawing generated from the source values cited on this page — nominal envelope, schematic section, not a manufacturer drawing. The PDF is A3 landscape and vector; the PNG is sized for a WhatsApp preview. Confirm thread, end caps, seal compound and micron/Beta grade against the original element before ordering.

Dimensions & series range

Outside diameter	232 mm (9.134 in)
Inside diameter	170 mm (6.693 in)
Overall length	172 mm (6.772 in)

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 1Q516359 page in verification queue	Aftermarket	full	Filtrec's official Cross Navigator maps GRANDI MOTORI TRIESTE 1Q516359 to FILTREC WP559 as a direct replacement, publishing the FILTREC element's OD/ID/height envelope and media grade.

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.

Full chart: Filtrec cross reference chart →

How the WP559 model number is decoded

C25Filtrec internal media grade code (cellulose, 25 µm).

Typical equipment & applications

Filtrec aftermarket replacement hydraulic/lube filter element (WP family), form-fit-function cross-referenced in Filtrec's official Cross Navigator.

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.

Frequently asked questions

What are the dimensions of the WP559 filter element?

The published envelope is 232 mm OD × 172 mm length with a 170 mm inside diameter (9.134 × 6.772 in × 6.693 in ID). Confirm against the housing drawing before ordering.

What micron rating does WP559 use?

This element is rated 25 µm (nominal class) — β25(c)≥2. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

What replaces the WP559 filter element?

1 catalog-confirmed full match(es) (1Q516359)

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.

Other models in the Filtrec elements series

All 9874 (list page 19/20) →

A105C05 96×60 mm · 5 µm A105C10 96×60 mm · 10 µm A105C25 96×60 mm · 25 µm A105G03 96×60 mm · 5 µm A105G06 96×60 mm · 7 µm A105G10 96×60 mm · 12 µm A105G25 96×60 mm · 22 µm A105T125 96×60 mm · 125 µm A105T250 96×60 mm · 250 µm A105T60 96×60 mm · 60 µm

Reviewed & verified by the ElementRef engineering desk against Filtrec S.p.A. on 2026-10-03. Read our editorial & correction policy.