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Technical Data Sheet
PartsTable / O-RING / 39502
39502 ✓ Verified by PartsTable
Legrand · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

PROTECTOR,THERMAL-OVERLOAD,ELECT. Key specifications include material: STEEL BLADE, tip_type: PHILLIPS CROSS, ball_stud: INCLUDED, design_type: BALL STUD, temp_rating: -20.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF, thread_size: 1/2-20. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-166-1111, 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
39502
NSN: 5331-00-166-1111
FSC: 5331 — O-RING
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
materialSTEEL BLADE
tip_typePHILLIPS CROSS
ball_studINCLUDED
design_typeBALL STUD
temp_rating-20.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
thread_size1/2-20
blade_length7.000 INCHES NOMINAL IN
current_typeAC
taper_length1.562 INCHES NOMINAL IN
thread_length0.625 INCHES NOMINAL IN
hardness_rating90.0 SHORE DUROMETER A NOMINAL
outside_diameter1.637 INCHES NOMINAL IN
NSN5331-00-166-1111
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 39502 MFR: Legrand ⚠ 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
•
TEMP RATING: -20.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.347 INCHES MINIMUM AND 1.371 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.637 INCHES NOMINAL IN
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
TEMP RATING-20.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.347 INCHES MINIMUM AND 1.371 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.637 INCHES NOMINAL IN
MATERIALRUBBER FLUOROCARBON CLASS FPM
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
AS3581-220Interchangeable
interchangeable cross-reference
interchangeable
AC180-220Interchangeable
interchangeable cross-reference
interchangeable
ARP568-220MILG23652TYPE2Interchangeable
interchangeable cross-reference
interchangeable
8126699-2Interchangeable
interchangeable cross-reference
interchangeable
9992-2Interchangeable
interchangeable cross-reference
interchangeable
35360064Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 39502?
39502 is a PROTECTOR,THERMAL-OVERLOAD,ELECT manufactured by Legrand.
What parts can replace 39502?
There are 27 known substitutes for 39502: AS3581-220, AC180-220, ARP568-220MILG23652TYPE2 and 24 more. Substitute compatibility should be verified for your specific system.
Is 39502 still available?
39502 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