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Technical Data Sheet
PartsTable / COMPONENT / 389-20
389-20 ✓ 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 ATTENUATOR,FIXED is a the manufacturer industrial component. Key specifications include diameter: 0.204 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING CUSHION, body_style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE, power_rating: 2.0 WATTS AVERAGE AND 0.2 KILOWATTS PEAK, overall_width: 0.500 INCHES NOMINAL IN, overall_length: 2.656 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-637-1939, 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
389-20
NSN: 5340-00-637-1939
FSC: 5340
CAGE: 83930 — TRANSDIGM INC DBA ADEL WIGGINS GROUP DIV ADEL WIGGINS (USA)
SPECIFICATIONS
diameter0.204 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING CUSHION
body_styleROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE
power_rating2.0 WATTS AVERAGE AND 0.2 KILOWATTS PEAK
overall_width0.500 INCHES NOMINAL IN
overall_length2.656 INCHES MAXIMUM IN
frequency_range0.000 HERTZ MINIMUM AND 18.000 GIGAHERTZ MAXIMUM
mounting_methodCONNECTOR
overall_diameter0.812 INCHES NOMINAL IN
style_designatorSINGLE LOOP
tongue_hole_typeROUND, UNTHREADED
surface_treatmentPASSIVATE BAND
NSN5340-00-637-1939
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 389-20 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 DOCUMENT AND CLASSIFICATION: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE BAND
•
SURFACE TREATMENT: PASSIVATE BAND
•
MATERIAL THICKNESS: 0.064 INCHES NOMINAL IN
•
CUSHIONING ENVIRONMENTAL PROTECTION: HEAT
•
MATERIAL: STEEL CORROSION RESISTING CUSHION
•
TONGUE HOLE TYPE: ROUND, UNTHREADED
•
LOOP INSIDE DIAMETER: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE BAND
SURFACE TREATMENTPASSIVATE BAND
MATERIAL THICKNESS0.064 INCHES NOMINAL IN
OVERALL WIDTH0.500 INCHES NOMINAL IN
CUSHIONING ENVIRONMENTAL PROTECTIONHEAT
MATERIALSTEEL CORROSION RESISTING CUSHION
TONGUE HOLE TYPEROUND, UNTHREADED
LOOP INSIDE DIAMETER1.250 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN LOOP AND MOUNTING HOLE1.125 INCHES NOMINAL IN
STYLE DESIGNATORSINGLE LOOP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
63B47001-1Interchangeable
interchangeable cross-reference
interchangeable
397-20Interchangeable
interchangeable cross-reference
interchangeable
416821-2DInterchangeable
interchangeable cross-reference
interchangeable
801621-018 PIECE 1Interchangeable
interchangeable cross-reference
interchangeable
17BC02XPP3H26Interchangeable
interchangeable cross-reference
interchangeable
286834Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 389-20?
389-20 is a ATTENUATOR,FIXED.
What parts can replace 389-20?
There are 14 known substitutes for 389-20: 63B47001-1, 397-20, 416821-2D and 11 more. Substitute compatibility should be verified for your specific system.
Is 389-20 still available?
389-20 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