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A77138 ✓ 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 surface_treatment: CADMIUM CASE, reference_number_differentiating_characteristics: AS DIFFERENTIATED BY SURFACE TREATMENT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-292-0829, 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
A77138
NSN: 5330-00-292-0829
FSC: 5330
CAGE: 78047 — CAPITOL ENGINE CO, INC DBA SALMINI WORLDWIDE (USA)
SPECIFICATIONS
surface_treatmentCADMIUM CASE
reference_number_differentiating_characteristicsAS DIFFERENTIATED BY SURFACE TREATMENT
NSN5330-00-292-0829
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A77138 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
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: AS DIFFERENTIATED BY SURFACE TREATMENT
•
SURFACE TREATMENT: CADMIUM CASE
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY SURFACE TREATMENT
SURFACE TREATMENTCADMIUM CASE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
6145Interchangeable
interchangeable cross-reference
interchangeable
8519ITEM26Interchangeable
interchangeable cross-reference
interchangeable
8517ITEM26Interchangeable
interchangeable cross-reference
interchangeable
8512ITEM25Interchangeable
interchangeable cross-reference
interchangeable
6181-XX 25Interchangeable
interchangeable cross-reference
interchangeable
BW7224 ITEM 34Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A77138?
A77138 is a SEAL,PLAIN ENCASED.
What parts can replace A77138?
There are 10 known substitutes for A77138: 6145, 8519ITEM26, 8517ITEM26 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A77138?
A77138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-292-0829. 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