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MIL-G-20078 — SEAL,NONMETALLIC SPECIAL SHAPED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MIL-G-20078: SEAL,NONMETALLIC SPECIAL SHAPED.

SEAL,NONMETALLIC SPECIAL SHAPED. Key specifications include material: RUBBER BUTADIENE-STYRENE CLASS SBR OVERALL, minor_width: 1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN, construction: SOLID, minor_height: 0.312 INCHES NOMINAL IN, end_cut_angle: 45.0 DEGREES, overall_length: 300.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-377-6524, 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
MIL-G-20078
NSN: 5330-00-377-6524
FSC: 5330 — Packing and Gasket Materials
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
minor_width1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
constructionSOLID
minor_height0.312 INCHES NOMINAL IN
end_cut_angle45.0 DEGREES
overall_length300.000 INCHES NOMINAL IN
style_designatorSTRIP
attachment_methodCEMENTED
fabrication_methodSOLID
cross-sectional_width1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
cross-sectional_height0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
cross-sectional_shape_styleU SHAPE
NSN5330-00-377-6524
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-G-20078 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: 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
•
CROSS-SECTIONAL WIDTH: 1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
•
MINOR HEIGHT: 0.312 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRIP
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-900 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: U SHAPE
•
MINOR WIDTH: 1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
CROSS-SECTIONAL WIDTH1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
MINOR HEIGHT0.312 INCHES NOMINAL IN
STYLE DESIGNATORSTRIP
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-900 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH300.000 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEU SHAPE
MINOR WIDTH1.250 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY MINOR HEIGHT
NONDEFINITIVE SPEC/STD DATAB TYPE
SUBSTITUTES & CROSS-REFERENCES 7
124-1553911 PARReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
G45304Reference document
Same NSN cross-reference
Reference document — Secondary reference
124-1900006 PARReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
124-4454122 PC 24Reference document
Same NSN cross-reference
Reference document — Secondary reference
124-1900005 PARReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
124-4400059 PC 1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedAcquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MIL-G-20078?
MIL-G-20078 is a SEAL,NONMETALLIC SPECIAL SHAPED.
What parts can replace MIL-G-20078?
There are 7 known substitutes for MIL-G-20078: 124-1553911 PAR, G45304, 124-1900006 PAR and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-G-20078?
MIL-G-20078 is cataloged in the U.S. Government catalog under NSN 5330-00-377-6524. 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.