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M2518A — SEAL,PLAIN ENCASED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M2518A: SEAL,PLAIN ENCASED.

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.109 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN, housing_bore_diameter: 0.685 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN, sealing_element_style: ANGULAR, accommodated_shaft_diameter: 0.437 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-488-6291, 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
M2518A
NSN: 5330-00-488-6291
FSC: 5330 — Packing and Gasket Materials
CAGE: 61208 — TWIN DISC, INCORPORATED DBA TWIN DISC MID-ATLANTIC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.109 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN
housing_bore_diameter0.685 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
sealing_element_styleANGULAR
accommodated_shaft_diameter0.437 INCHES NOMINAL IN
material_document_and_classification2412 FSCM 96879 MFR REF SINGLE MATERIAL RESPONSE SEALING ELEMENT
NSN5330-00-488-6291
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M2518A 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
•
SEAL WIDTH: 0.109 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: ANGULAR
•
HOUSING BORE DIAMETER: 0.685 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 2412 FSCM 96879 MFR REF SINGLE MATERIAL RESPONSE SEALING ELEMENT
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT DIAMETER: 0.437 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC SEALING ELEMENT
TECHNICAL CHARACTERISTICS
SEAL WIDTH0.109 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER0.685 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION2412 FSCM 96879 MFR REF SINGLE MATERIAL RESPONSE SEALING ELEMENT
CASE STYLESQUARE
ACCOMMODATED SHAFT DIAMETER0.437 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M2518A?
M2518A is a SEAL,PLAIN ENCASED.
What is the NSN for M2518A?
M2518A is cataloged in the U.S. Government catalog under NSN 5330-00-488-6291. 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.