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2587121 — SEAL,PLAIN ENCASED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2587121: SEAL,PLAIN ENCASED.

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE NITRILE SEALING ELEMENT, case_style: SQUARE, seal_width: 3.500 INCHES NOMINAL IN, temp_rating: 250.0 FAHRENHEIT DEGF, outside_diameter: 3.505 INCHES NOMINAL IN, surface_treatment: PLASTIC CASE. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-038-0678, 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
2587121
NSN: 5330-01-038-0678
FSC: 5330 — Packing and Gasket Materials
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE NITRILE SEALING ELEMENT
case_styleSQUARE
seal_width3.500 INCHES NOMINAL IN
temp_rating250.0 FAHRENHEIT DEGF
outside_diameter3.505 INCHES NOMINAL IN
surface_treatmentPLASTIC CASE
housing_bore_diameter3.500 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter2.250 INCHES NOMINAL IN
NSN5330-01-038-0678
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2587121 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
•
TEMP RATING: 250.0 FAHRENHEIT DEGF
•
SEAL WIDTH: 3.500 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULAR
•
OUTSIDE DIAMETER: 3.505 INCHES NOMINAL IN
•
HOUSING BORE DIAMETER: 3.500 INCHES NOMINAL IN
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT DIAMETER: 2.250 INCHES NOMINAL IN
•
SURFACE TREATMENT: PLASTIC CASE
TECHNICAL CHARACTERISTICS
TEMP RATING250.0 FAHRENHEIT DEGF
SEAL WIDTH3.500 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR
OUTSIDE DIAMETER3.505 INCHES NOMINAL IN
HOUSING BORE DIAMETER3.500 INCHES NOMINAL IN
CASE STYLESQUARE
ACCOMMODATED SHAFT DIAMETER2.250 INCHES NOMINAL IN
SURFACE TREATMENTPLASTIC CASE
MATERIALRUBBER BUTADIENE NITRILE SEALING ELEMENT
SUBSTITUTES & CROSS-REFERENCES 1
508532Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 2587121?
2587121 is a SEAL,PLAIN ENCASED.
What parts can replace 2587121?
There is 1 known substitute for 2587121: 508532. Substitute compatibility should be verified for your specific system.
What is the NSN for 2587121?
2587121 is cataloged in the U.S. Government catalog under NSN 5330-01-038-0678. 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.