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Technical Data Sheet
PartsTable / COMPONENT / NRN4556A
NRN4556A ✓ 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 COVER,ACCESS is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-237-8654, 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
NRN4556A
NSN: 5340-01-237-8654
FSC: 5340
CAGE: 78205 — MOTOROLA SOLUTIONS, INC. DBA MOTOROLA SOLUTIONS, INC DIV U.S. FEDERAL GOVERNMENT MARKETS REGION (USA)
SPECIFICATIONS
Part NumberNRN4556A
NSN5340-01-237-8654
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NRN4556A 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
A-A-59484Interchangeable
interchangeable cross-reference
interchangeable
MIL-B-23755Interchangeable
interchangeable cross-reference
interchangeable
816Interchangeable
interchangeable cross-reference
interchangeable
SO 816Interchangeable
Same NIIN cross-reference
interchangeable
NLN4512BInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NRN4556A?
NRN4556A is a COVER,ACCESS.
What parts can replace NRN4556A?
There are 5 known substitutes for NRN4556A: A-A-59484, MIL-B-23755, 816 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NRN4556A?
NRN4556A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-237-8654. 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