Internormen
The Internormen 311549 is a 20µm paper hydraulic filter element. It measures 1.75" OD x 0.87" ID x 4.25" long. Filtration efficiency is rated at β2 ≥ 20 per ISO 16889. Seals are VITON, rated for -13°F to 250°F. Collapse pressure rating is 305 PSID. 1 verified cross-reference is available from aftermarket manufacturers.
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Technical specifications for the Internormen 311549 filter element. Data sourced from manufacturer catalogs and verified against OEM documentation.
| Specification | Value |
|---|---|
| Micron Rating | 20µm |
| Media Type | PAPER |
| Collapse Rating | 305 PSID |
| Efficiency (ISO 16889) | β2 ≥ 20 |
| O.D. (inches) | 1.75" |
| I.D. (inches) | 0.87" |
| O.A.L. (inches) | 4.25" |
| Seal Material | VITON |
| Flow Direction | OUTSIDE-IN |
| Operating Temperature | -13°F to 250°F |
Last verified: February 2026
1 verified cross-reference available from Hy-Pro. All cross-references are reviewed for dimensional and performance compatibility.
| Manufacturer | Part Number | Confidence |
|---|---|---|
| Hy-Pro | Request part number | Verified |
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Last verified: February 2026
The INTERNORMEN 311549 is designed for use in hydraulic and lubrication filtration systems. With a 20µm rating, this element is suitable for pump and component protection in industrial hydraulic circuits. VITON seals provide compatibility with petroleum-based fluids, synthetic fluids, phosphate esters, and water-glycol mixtures.
The 305 PSID collapse rating indicates the maximum differential pressure this element can withstand during cold starts or bypass conditions without structural failure. Ensure your system's maximum differential pressure does not exceed this rating.
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