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PartsTable / COMPONENT / 257739R91
257739R91 ✓ 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 SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: LEATHER OR RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.375 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, housing_bore_diameter: 1.375 INCHES NOMINAL IN, sealing_element_style: ANGULAR, accommodated_shaft_diameter: 0.656 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 5330-00-285-6385, 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
257739R91
NSN: 5330-00-285-6385
FSC: 5330
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialLEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.375 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
housing_bore_diameter1.375 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter0.656 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed2000 FEET PER MINUTE FT
NSN5330-00-285-6385
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 257739R91 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
•
ACCOMMODATED SHAFT DIAMETER: 0.656 INCHES NOMINAL IN
•
MATERIAL: LEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 2000 FEET PER MINUTE FT
•
HOUSING BORE DIAMETER: 1.375 INCHES NOMINAL IN
•
SEAL WIDTH: 0.375 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: ANGULAR
•
CASE STYLE: SQUARE
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT DIAMETER0.656 INCHES NOMINAL IN
MATERIALLEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
HOUSING BORE DIAMETER1.375 INCHES NOMINAL IN
SEAL WIDTH0.375 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
SEALING ELEMENT STYLEANGULAR
CASE STYLESQUARE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
500-204Interchangeable
interchangeable cross-reference
interchangeable
500-24Interchangeable
interchangeable cross-reference
interchangeable
GC-6000-A-2-GInterchangeable
interchangeable cross-reference
interchangeable
656-4Interchangeable
interchangeable cross-reference
interchangeable
41B1944-364Interchangeable
interchangeable cross-reference
interchangeable
41B1944-355Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 257739R91?
257739R91 is a SEAL,PLAIN ENCASED.
What parts can replace 257739R91?
There are 18 known substitutes for 257739R91: 500-204, 500-24, GC-6000-A-2-G and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 257739R91?
257739R91 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-285-6385. 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