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3949688 — PACKING,PREFORMED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3949688: PACKING,PREFORMED.

The PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL, special_features: CHAMFERED ON ALL FOUR CORNERS OF THE CROSS SECTION, end_item_identification: DIESEL ENGINE FUEL PUMP, cross-sectional_shape_style: SQUARE/RECTANGULAR, part_name_assigned_by_controlling_agency: RECTANGULAR RING SEAL. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-527-2285, 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
3949688
NSN: 5330-01-527-2285
FSC: 5330 — Packing and Gasket Materials
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
special_featuresCHAMFERED ON ALL FOUR CORNERS OF THE CROSS SECTION
end_item_identificationDIESEL ENGINE FUEL PUMP
cross-sectional_shape_styleSQUARE/RECTANGULAR
part_name_assigned_by_controlling_agencyRECTANGULAR RING SEAL
NSN5330-01-527-2285
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3949688 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
KEY FEATURES
•
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
SPECIAL FEATURESCHAMFERED ON ALL FOUR CORNERS OF THE CROSS SECTION
PART NAME ASSIGNED BY CONTROLLING AGENCYRECTANGULAR RING SEAL
END ITEM IDENTIFICATIONDIESEL ENGINE FUEL PUMP
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3949688?
3949688 is a PACKING,PREFORMED.
What is the NSN for 3949688?
3949688 is cataloged in the U.S. Government catalog under NSN 5330-01-527-2285. 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.