Schroeder Industries · BestFit Elements · inline line

KZ1 filter element: specifications & equivalents

Q: What are the dimensions of the KZ1 filter element?

The published envelope is 99 mm OD × 231 mm length with a 41 mm inside diameter (3.898 × 9.094 in × 1.614 in ID). Confirm against the housing drawing before ordering.

Q: What micron rating does KZ1 use?

This element is rated 1 µm (nominal class) — 4.2 µm at β(c) ≥ 1000 (99.9% efficiency). Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

The KZ1 is a Schroeder Industries inline-line hydraulic filter element, built with excellement® z-media® (synthetic) media, sized 99 × 231 mm OD × length (ID 41 mm), rated at 1 µm class (4.2 µm at β(c) ≥ 1000 (99.9% efficiency)). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 99 × 231 mm

Inside diameter 41 mm

Filtration rating 1 µm nom.

Beta rating 4.2 µm at β(c) ≥ 1000 (99.9% efficiency)

Media Excellement® Z-Media® (Synthetic)

Collapse / burst 10.3 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.

Dimensions, ratings and seal compound are taken from the Schroeder Industries online catalog. The nominal µm rating and the β200 absolute rating use different conventions — match the existing media grade before substituting; verify against the current Schroeder data sheet before ordering.

Specification table

Parameter	Value
Filter type	inline line
Media	Excellement® Z-Media® (Synthetic)
Filtration rating	1 µm
Rating basis	nominal
Beta ratio	4.2 µm at β(c) ≥ 1000 (99.9% efficiency)
Outside diameter OD	99 mm
Inside diameter ID	41 mm
Length	231 mm
End caps	open-ended cartridge element
Collapse / burst pressure	10.3 bar
Integral bypass valve	none (housing/valve-dependent)
Seal material	Nitrile (Buna-N)
Operating temperature	-29 to 107 °C
Mass	820 g
Source catalog	Schroeder Industries: Schroeder Industries online catalog (catalog.schroederindustries.com)
Last verified	2026-09-28

Sources: Schroeder Industries — Schroeder Industries online catalog (catalog.schroederindustries.com) — accessed 2026-09-28.

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

Dimensions & series range

Outside diameter	99 mm (3.898 in)
Inside diameter	41 mm (1.614 in)
Overall length	231 mm (9.094 in)

All 99×231 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 1HF41H3SLA000P page in verification queue	Aftermarket	partial	Schroeder online cross-reference (EPE); envelope match — verify grade and seals.
↔ 2060528 page in verification queue	UFI	partial	Schroeder online cross-reference (HYDAC); envelope match — verify grade and seals.
↔ 2970L01B09 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (SEPARATION TECHNOLOGIES); envelope match — verify grade and seals.
↔ 3970GGBB09 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (SEPARATION TECHNOLOGIES); envelope match — verify grade and seals.
↔ 52214178 page in verification queue	UFI	partial	Schroeder online cross-reference (INGERSOLL RAND); envelope match — verify grade and seals.
↔ 6100EAL012N1 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PUROLATOR); envelope match — verify grade and seals.
↔ 6100EAL032N1 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PUROLATOR); envelope match — verify grade and seals.
↔ 7575901 page in verification queue	UFI	partial	Schroeder online cross-reference (HEIL); envelope match — verify grade and seals.
↔ 818AGC03CB page in verification queue	Aftermarket	partial	Schroeder online cross-reference (SEPARATION TECHNOLOGIES); envelope match — verify grade and seals.
↔ 925778 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PARKER); envelope match — verify grade and seals.
↔ 9327271 page in verification queue	UFI	partial	Schroeder online cross-reference (PUROLATOR); envelope match — verify grade and seals.
↔ 9327272 page in verification queue	UFI	partial	Schroeder online cross-reference (PUROLATOR); envelope match — verify grade and seals.
↔ 934285 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PARKER); envelope match — verify grade and seals.
↔ 934285Q page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PARKER); envelope match — verify grade and seals.
↔ 9700EAL012N1 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (PUROLATOR); envelope match — verify grade and seals.
↔ BEK903A page in verification queue	Aftermarket	partial	Schroeder online cross-reference (BEHRINGER); envelope match — verify grade and seals.
↔ C925778 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (COMMERCIAL); envelope match — verify grade and seals.
↔ C926898 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (COMMERCIAL); envelope match — verify grade and seals.
↔ DE4051B3C03 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (DENISON); envelope match — verify grade and seals.
↔ E4051B3C03 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (WESTERN); envelope match — verify grade and seals.
↔ FD650G03A page in verification queue	Aftermarket	partial	Schroeder online cross-reference (FRAM); envelope match — verify grade and seals.
↔ HC9700FCZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9700FDZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9700FKZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9700FUZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9700FXZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9720FKP9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9720FKZ27H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9720FKZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HC9735FKZ9H page in verification queue	Pall	partial	Schroeder online cross-reference (PALL); envelope match — verify grade and seals.
↔ HF4070GFB page in verification queue	Fleetguard	partial	Schroeder online cross-reference (PTI); envelope match — verify grade and seals.
↔ HF4070GFV page in verification queue	Fleetguard	partial	Schroeder online cross-reference (PTI); envelope match — verify grade and seals.
↔ HF413B page in verification queue	Fleetguard	partial	Schroeder online cross-reference (NORCO); envelope match — verify grade and seals.
↔ HF413N page in verification queue	Fleetguard	partial	Schroeder online cross-reference (NORCO); envelope match — verify grade and seals.
↔ HF41L3NQ page in verification queue	Fleetguard	partial	Schroeder online cross-reference (PARKER); envelope match — verify grade and seals.
↔ HF4L3N page in verification queue	Fleetguard	partial	Schroeder online cross-reference (SAE AUTO ID); envelope match — verify grade and seals.
↔ HF4L3NQ page in verification queue	Fleetguard	partial	Schroeder online cross-reference (PARKER); envelope match — verify grade and seals.
↔ HF7331	Fleetguard	partial	Fleetguard's online catalog lists KZ1 as an interchange for HF7331. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HK003BN3 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (HYDAC); envelope match — verify grade and seals.
↔ MP69616 page in verification queue	MP Filtri	partial	Schroeder online cross-reference (MP FILTRI); envelope match — verify grade and seals.
↔ NFI3SK page in verification queue	Aftermarket	partial	Schroeder online cross-reference (NATIONAL FILTER); envelope match — verify grade and seals.
↔ PT707-HD3	Baldwin Filters	partial	Schroeder online cross-reference (BALDWIN); envelope match — verify grade and seals.
↔ PT8370-MPG	Baldwin Filters	partial	Schroeder online cross-reference (BALDWIN); envelope match — verify grade and seals.
↔ RKH0903A page in verification queue	Aftermarket	partial	Schroeder online cross-reference (FAIREY ARLON); envelope match — verify grade and seals.
↔ SRE40903 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (ZINGA); envelope match — verify grade and seals.
↔ SRE4093 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (ZINGA); envelope match — verify grade and seals.
↔ ST6109 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (SEPARATION TECHNOLOGIES); envelope match — verify grade and seals.
↔ TTK91B page in verification queue	Aftermarket	partial	Schroeder online cross-reference (TODD TECHNOLOGIES INC); envelope match — verify grade and seals.
↔ V4051B3C01 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (VICKERS); envelope match — verify grade and seals.
↔ WGH6109 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (WOODGATE); envelope match — verify grade and seals.
↔ ZSRE40903 page in verification queue	Aftermarket	partial	Schroeder online cross-reference (ZINGA); envelope match — verify grade and seals.

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 KZ1 model number is decoded

KZ1Schroeder BestFit filter element part number of the K housing-size family.
Excellement® Z-Media® (Synthetic)Filter media execution.
1 µmNominal filter rating as printed in the Schroeder catalog.
β≥1000Absolute rating: 4.2 µm particle size at β(c) ≥ 1000, 99.9% efficiency.
99 mmOuter diameter.
41 mmInner diameter.
231 mmElement height.
10.3 barElement collapse pressure rating.
Nitrile (Buna-N)Seal compound.

Typical equipment & applications

Replacement element for Schroeder hydraulic and lube filter housings
Industrial and mobile hydraulic filtration

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).
Fine 1 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 KZ1 filter element?

The published envelope is 99 mm OD × 231 mm length with a 41 mm inside diameter (3.898 × 9.094 in × 1.614 in ID). Confirm against the housing drawing before ordering.

What micron rating does KZ1 use?

This element is rated 1 µm (nominal class) — 4.2 µm at β(c) ≥ 1000 (99.9% efficiency). Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

What replaces the KZ1 filter element?

51 partial match(es) requiring parameter review

How do I read the KZ1 part number?

See the designation decoder above: each segment of KZ1 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 86 catalog element(s) share the 99×231 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

BRE-10 Schroeder Industries · 10 µm BRE-25 Schroeder Industries · 25 µm BRE-3 Schroeder Industries · 3 µm BRE-Z10 Schroeder Industries · 10 µm BRE-Z5 Schroeder Industries · 5 µm K10 Schroeder Industries · 10 µm K10C Schroeder Industries · 10 µm K10H Schroeder Industries · 10 µm K25 Schroeder Industries · 25 µm K25C Schroeder Industries · 25 µm

Other models in the BestFit Elements series

All 1082 →

10DVZ1 74×249 mm · 1 µm 10DVZ10 74×249 mm · 10 µm 10DVZ10V 74×249 mm · 10 µm 10DVZ25 74×249 mm · 25 µm 10DVZ3 74×249 mm · 3 µm 10DVZ5 74×249 mm · 5 µm 13HAS10 91×328 mm · 10 µm 13HASX10 91×328 mm · 10 µm 13HZ10 91×328 mm · 10 µm 13HZ10V 91×328 mm · 10 µm

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