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Technical Data Sheet
PartsTable / COMPONENT / A31-139
A31-139 ✓ 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 TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: LEATHER OR RUBBER SYNTHETIC SEALING ELEMENT, body_width: 0.813 INCHES NOMINAL IN, case_style: SQUARE, seal_width: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN, body_height: 0.688 INCHES NOMINAL IN, body_length: 2.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-292-1612, 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
A31-139
NSN: 5330-00-292-1612
FSC: 5330
CAGE: 35301 — DRESSER INDUSTRIES INC LEROI DIV (USA)
SPECIFICATIONS
materialLEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
body_width0.813 INCHES NOMINAL IN
case_styleSQUARE
seal_width0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
body_height0.688 INCHES NOMINAL IN
body_length2.000 INCHES NOMINAL IN
rating_methodELECTRICAL AND WINDING TURNS SINGLE COMPONENT SINGLE WINDING
turn_quantity30 SINGLE COMPONENT SINGLE WINDING
coil_form_typeSOLID SINGLE COMPONENT
inclosure_typeFULLY INCLOSED
mounting_methodTERMINAL SINGLE GROUP
outside_diameter2.378 INCHES NOMINAL IN
NSN5330-00-292-1612
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A31-139 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
•
CASE STYLE: SQUARE
•
SEAL WIDTH: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: ANGULAR
•
SURFACE TREATMENT: PLASTIC CASE
•
OUTSIDE DIAMETER: 2.378 INCHES NOMINAL IN
•
MATERIAL: LEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
•
ACCOMMODATED SHAFT DIAMETER: 1.438 INCHES NOMINAL IN
•
HOUSING BORE DIAMETER: 2.374 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CASE STYLESQUARE
SEAL WIDTH0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
SEALING ELEMENT STYLEANGULAR
SURFACE TREATMENTPLASTIC CASE
OUTSIDE DIAMETER2.378 INCHES NOMINAL IN
MATERIALLEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER1.438 INCHES NOMINAL IN
HOUSING BORE DIAMETER2.374 INCHES NOMINAL IN
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
604-3-4Interchangeable
interchangeable cross-reference
interchangeable
A-1526Interchangeable
interchangeable cross-reference
interchangeable
W1146Interchangeable
interchangeable cross-reference
interchangeable
49306Interchangeable
interchangeable cross-reference
interchangeable
14282Interchangeable
interchangeable cross-reference
interchangeable
TA11477-00-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A31-139?
A31-139 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace A31-139?
There are 21 known substitutes for A31-139: 604-3-4, A-1526, W1146 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A31-139?
A31-139 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-292-1612. 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