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4054T78 ✓ 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

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: STEEL CASE, case_style: RECESSED, seal_width: 0.925 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN, attachment_method: CEMENTED, sealing_element_style: VERTICAL, accommodated_shaft_diameter: 3.975 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-123-2162, 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
4054T78
NSN: 5330-01-123-2162
FSC: 5330
CAGE: 99207 — GENERAL ELECTRIC COMPANY DBA GE AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL CASE
case_styleRECESSED
seal_width0.925 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
attachment_methodCEMENTED
sealing_element_styleVERTICAL
accommodated_shaft_diameter3.975 INCHES NOMINAL IN
NSN5330-01-123-2162
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4054T78 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
•
CASE STYLE: RECESSED
•
ATTACHMENT METHOD: CEMENTED
•
ACCOMMODATED SHAFT DIAMETER: 3.975 INCHES NOMINAL IN
•
SEAL WIDTH: 0.925 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: VERTICAL
•
MATERIAL: STEEL CASE
TECHNICAL CHARACTERISTICS (FLIS)
CASE STYLERECESSED
ATTACHMENT METHODCEMENTED
ACCOMMODATED SHAFT DIAMETER3.975 INCHES NOMINAL IN
SEAL WIDTH0.925 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
SEALING ELEMENT STYLEVERTICAL
MATERIALSTEEL CASE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
3004-81Interchangeable
interchangeable cross-reference
interchangeable
722BFCQBInterchangeable
interchangeable cross-reference
interchangeable
PERMACHROMEInterchangeable
interchangeable cross-reference
interchangeable
70084 ITEM NO. 4Interchangeable
interchangeable cross-reference
interchangeable
800741Interchangeable
interchangeable cross-reference
interchangeable
SSCY5699Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4054T78?
4054T78 is a SEAL,PLAIN ENCASED.
What parts can replace 4054T78?
There are 8 known substitutes for 4054T78: 3004-81, 722BFCQB, PERMACHROME and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4054T78?
4054T78 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-123-2162. 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