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NSD-4127 — PACKING,PREFORMED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

NSD-4127: PACKING,PREFORMED.

The PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE AND GRAPHITE AND FIBER NONASBESTOS OVERALL, peripheral_diameter: 3.500 INCHES NOMINAL IN, center_hole_diameter: 2.750 INCHES NOMINAL IN, cross-sectional_height: 0.375 INCHES NOMINAL IN, end_item_identification: PUMP,CENTRIFUGAL,210 GPM,250 PSI, 3550 RPM MD VLT RPM, cross-sectional_shape_style: SQUARE/RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-556-2646, 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
NSD-4127
NSN: 5330-01-556-2646
FSC: 5330 — Packing and Gasket Materials
CAGE: 0ABT6 — SPECIALTY SEALS & ACCESSORIES, INC. (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE AND GRAPHITE AND FIBER NONASBESTOS OVERALL
special_featuresSTYLE OF PACKING IS ANTIKEYSTONE 2 (STAYS SQUARE, DOES NOT BULGE UP); 5 RINGS ARE REQUIRED TO PREVENT FAILURE OF EFFECTIVE SEALING
peripheral_diameter3.500 INCHES NOMINAL IN
center_hole_diameter2.750 INCHES NOMINAL IN
cross-sectional_height0.375 INCHES NOMINAL IN
end_item_identificationPUMP,CENTRIFUGAL,210 GPM,250 PSI, 3550 RPM MD VLT RPM
cross-sectional_shape_styleSQUARE/RECTANGULAR
NSN5330-01-556-2646
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NSD-4127 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 HEIGHT: 0.375 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR
•
PERIPHERAL DIAMETER: 3.500 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 2.750 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE AND GRAPHITE AND FIBER NONASBESTOS OVERALL
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.375 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
PERIPHERAL DIAMETER3.500 INCHES NOMINAL IN
SPECIAL FEATURESSTYLE OF PACKING IS ANTIKEYSTONE 2 (STAYS SQUARE, DOES NOT BULGE UP); 5 RINGS ARE REQUIRED TO PREVENT FAILURE OF EFFECTIVE SEALING
CENTER HOLE DIAMETER2.750 INCHES NOMINAL IN
END ITEM IDENTIFICATIONPUMP,CENTRIFUGAL,210 GPM,250 PSI, 3550 RPM MD VLT RPM
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE AND GRAPHITE AND FIBER NONASBESTOS 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NSD-4127?
NSD-4127 is a PACKING,PREFORMED.
What is the NSN for NSD-4127?
NSD-4127 is cataloged in the U.S. Government catalog under NSN 5330-01-556-2646. 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.