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4444688 — BACK-UP RING,PREFORMED PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4444688: BACK-UP RING,PREFORMED PACKING.

The BACK-UP RING,PREFORMED PACKING is a the manufacturer industrial component. Key specifications include special_features: MATERIAL IS STEEL, peripheral_diameter: 300.0 MILLIMETERS NOMINAL MM, end_item_identification: 2320-01-534-1887;TRUCK.CARGO, cross-sectional_thickness: 5.00 MILLIMETERS NOMINAL MM, cross-sectional_shape_style: SOLID, part_name_assigned_by_controlling_agency: RING,BACKUP,COL BASE,CRANE. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-680-4828, 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
4444688
NSN: 5330-01-680-4828
FSC: 5330 — Packing and Gasket Materials
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
special_featuresMATERIAL IS STEEL
peripheral_diameter300.0 MILLIMETERS NOMINAL MM
end_item_identification2320-01-534-1887;TRUCK.CARGO
cross-sectional_thickness5.00 MILLIMETERS NOMINAL MM
cross-sectional_shape_styleSOLID
part_name_assigned_by_controlling_agencyRING,BACKUP,COL BASE,CRANE
NSN5330-01-680-4828
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4444688 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 THICKNESS: 5.00 MILLIMETERS NOMINAL MM
•
CROSS-SECTIONAL SHAPE STYLE: SOLID
•
PERIPHERAL DIAMETER: 300.0 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS5.00 MILLIMETERS NOMINAL MM
CROSS-SECTIONAL SHAPE STYLESOLID
PERIPHERAL DIAMETER300.0 MILLIMETERS NOMINAL MM
SPECIAL FEATURESMATERIAL IS STEEL
PART NAME ASSIGNED BY CONTROLLING AGENCYRING,BACKUP,COL BASE,CRANE
END ITEM IDENTIFICATION2320-01-534-1887;TRUCK.CARGO
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4444688?
4444688 is a BACK-UP RING,PREFORMED PACKING.
What is the NSN for 4444688?
4444688 is cataloged in the U.S. Government catalog under NSN 5330-01-680-4828. 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.