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MST206 ✓ 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

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: THREADED, thread_class: 2A A, overall_diameter: 0.750 INCHES NOMINAL IN, special_features: THREAD CLASS CAN ALSO BE 1A OR 3A A, inside_diameter_length: 0.563 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-579-5669, 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
MST206
NSN: 5340-00-579-5669
FSC: 5340
CAGE: 34669 — BUNZL PLASTIC INC DBA ALLIANCE PLASTICS (USA)
SPECIFICATIONS
materialPLASTIC
design_typeTHREADED
thread_class2A A
overall_diameter0.750 INCHES NOMINAL IN
special_featuresTHREAD CLASS CAN ALSO BE 1A OR 3A A
inside_diameter_length0.563 INCHES NOMINAL IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator9/16-18 UNF
NSN5340-00-579-5669
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MST206 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: PLASTIC
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 9/16-18 UNF
•
OVERALL DIAMETER: 0.750 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
•
DESIGN TYPE: THREADED
•
INSIDE DIAMETER LENGTH: 0.563 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESTHREAD CLASS CAN ALSO BE 1A OR 3A A
MATERIALPLASTIC
THREAD SIZE AND SERIES/TYPE DESIGNATOR9/16-18 UNF
OVERALL DIAMETER0.750 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
DESIGN TYPETHREADED
INSIDE DIAMETER LENGTH0.563 INCHES NOMINAL IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
717-013015Interchangeable
interchangeable cross-reference
interchangeable
52607Interchangeable
interchangeable cross-reference
interchangeable
1604-206YInterchangeable
interchangeable cross-reference
interchangeable
218220Interchangeable
interchangeable cross-reference
interchangeable
M2-06Interchangeable
interchangeable cross-reference
interchangeable
5B0426Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MST206?
MST206 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace MST206?
There are 15 known substitutes for MST206: 717-013015, 52607, 1604-206Y and 12 more. Substitute compatibility should be verified for your specific system.
Is MST206 still available?
MST206 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026