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N27978 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: COPPER ALLOY 836, material_document_and_classification: ASTM B62 ASSN STD SINGLE MATERIAL RESPONSE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-111-3155, 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
N27978
NSN: 5340-01-111-3155
FSC: 5340
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 836
material_document_and_classificationASTM B62 ASSN STD SINGLE MATERIAL RESPONSE
NSN5340-01-111-3155
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: N27978 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
•
MATERIAL: COPPER ALLOY 836
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B62 ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY 836
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B62 ASSN STD SINGLE MATERIAL RESPONSE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
43F1-4X1-8Interchangeable
interchangeable cross-reference
interchangeable
43X4Interchangeable
interchangeable cross-reference
interchangeable
7974893Interchangeable
interchangeable cross-reference
interchangeable
27119HAInterchangeable
interchangeable cross-reference
interchangeable
T3016Interchangeable
interchangeable cross-reference
interchangeable
BB7240Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N27978?
N27978 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace N27978?
There are 10 known substitutes for N27978: 43F1-4X1-8, 43X4, 7974893 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for N27978?
N27978 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-111-3155. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026