Internormen
The Internormen 311821 is a 25µm 304 ss wire hydraulic filter element. It measures 2.36" OD x 1.35" ID x 9.02" long. Seals are VITON, rated for -13°F to 250°F. Collapse pressure rating is 435 PSID. 1 verified cross-reference is available from aftermarket manufacturers.
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Technical specifications for the Internormen 311821 filter element. Data sourced from manufacturer catalogs and verified against OEM documentation.
| Specification | Value |
|---|---|
| Micron Rating | 25µm |
| Media Type | 304 SS WIRE |
| Collapse Rating | 435 PSID |
| O.D. (inches) | 2.36" |
| I.D. (inches) | 1.35" |
| O.A.L. (inches) | 9.02" |
| 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 311821 is designed for use in hydraulic and lubrication filtration systems. With a 25µm 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 435 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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