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311631 — FILTER ELEMENT,AIR CONDITIONING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

311631: FILTER ELEMENT,AIR CONDITIONING.

FILTER ELEMENT,AIR CONDITIONING. Key specifications include material: ALUMINUM FILTERING MEDIUM, design_type: REUSABLE, overall_width: 2.000 INCHES NOMINAL IN, style_designator: RECTANGULAR (INCL SQUARE), surface_treatment: CHROMATE FRAME, body_overall_length: 8.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-578-5304, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
311631
NSN: 5331-00-578-5304
NIINs: 005785304, 012190974
FSC: 5331 — O-ring
CAGE: 27319 — HONEYWELL INC RESIDENTIAL DIV (USA)
SPECIFICATIONS
materialALUMINUM FILTERING MEDIUM
design_typeREUSABLE
overall_width2.000 INCHES NOMINAL IN
style_designatorRECTANGULAR (INCL SQUARE)
surface_treatmentCHROMATE FRAME
body_overall_length8.000 INCHES NOMINAL IN
filtering_media_designMESH SINGLE FILTERING MEDIA RESPONSE
surface_treatment_document_and_classificationMIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE FILTERING MEDIUM
NSN5331-00-578-5304
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 311631 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 311631?
311631 is a FILTER ELEMENT,AIR CONDITIONING.
What is the NSN for 311631?
311631 is cataloged in the U.S. Government catalog under NSN 5331-00-578-5304. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.