PartsTable
Technical Data Sheet
Download PDF

390664C91 — SEAL UPPER COVER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

390664C91: SEAL UPPER COVER.

The SEAL UPPER COVER is a the manufacturer industrial component. Key specifications include material: RUBBER SEALING ELEMENT A, case_style: SQUARE, seal_width: 0.355 INCHES NOMINAL IN, attachment_method: ROUND HOLE, housing_bore_diameter: 1.311 INCHES NOMINAL IN, sealing_element_style: ANGULAR-OPPOSED. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-716-6786, 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
390664C91
NSN: 5330-00-716-6786
NIINs: 007166786, 010042150
FSC: 5330 — Packing and Gasket Materials
CAGE: 89346 — NAVISTAR INTL CORP TRUCK BR OHIO PLANT (USA)
SPECIFICATIONS
materialRUBBER SEALING ELEMENT A
case_styleSQUARE
seal_width0.355 INCHES NOMINAL IN
attachment_methodROUND HOLE
housing_bore_diameter1.311 INCHES NOMINAL IN
sealing_element_styleANGULAR-OPPOSED
attachment_hole_diameter0.094 INCHES NOMINAL IN
accommodated_shaft_diameter0.750 INCHES NOMINAL IN
attachment_feature_quantity8
attachment_feature_circle_diameter1.090 INCHES NOMINAL SINGLE CIRCLE IN
NSN5330-00-716-6786
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 390664C91 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
No demilitarization required
Ready to buy 390664C91?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 390664C91?
390664C91 is a SEAL UPPER COVER.
What is the NSN for 390664C91?
390664C91 is cataloged in the U.S. Government catalog under NSN 5330-00-716-6786. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 390664C91

✓ 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.