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PartsTable / COMPONENT / M5501/5-6
M5501/5-6 ✓ 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 M5501/5-6 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 5340-01-235-6188, 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
M5501/5-6
NSN: 5340-01-235-6188
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM5501/5-6
NSN5340-01-235-6188
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M5501/5-6 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: ALUMINUM ALLOY
•
DESIGN TYPE: THREADED
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/8-18 UNS
•
FEATURES PROVIDED: GASKET AND SHOULDER
•
OVERALL DIAMETER: 0.930 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD CLASS: 2A A
•
DRIVE TYPE: SERRATED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALALUMINUM ALLOY
DESIGN TYPETHREADED
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/8-18 UNS
FEATURES PROVIDEDGASKET AND SHOULDER
OVERALL DIAMETER0.930 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/2 FED SPEC SINGLE MATERIAL RESPONSE
THREAD CLASS2A A
DRIVE TYPESERRATED
SURFACE TREATMENTCHROMATE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
P-38Upgraded Successor
successor cross-reference
successor
M5501/5-R6Upgraded Successor
successor cross-reference
successor
NAS840P6Upgraded Successor
successor cross-reference
successor
MS3102E22-33SCInterchangeable
interchangeable cross-reference
interchangeable
MIL-C-5-5015Interchangeable
interchangeable cross-reference
interchangeable
M5501/5-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M5501/5-6?
M5501/5-6 is a M5501/5-6.
What parts can replace M5501/5-6?
There are 14 known substitutes for M5501/5-6: P-38, M5501/5-R6, NAS840P6 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M5501/5-6?
M5501/5-6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-235-6188. 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