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Technical Data Sheet
PartsTable / COMPONENT / 310525R91
310525R91 ✓ 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: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.625 INCHES NOMINAL IN, temp_rating: -30.0 FAHRENHEIT AND 300.0 FAHRENHEIT DEGF, housing_bore_diameter: 4.381 INCHES NOMINAL IN, sealing_element_style: ANGULAR. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-810-8482, 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
310525R91
NSN: 5330-00-810-8482
FSC: 5330
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.625 INCHES NOMINAL IN
temp_rating-30.0 FAHRENHEIT AND 300.0 FAHRENHEIT DEGF
housing_bore_diameter4.381 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter3.375 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed3000 FEET PER MINUTE FT
NSN5330-00-810-8482
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 310525R91 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 MAXIMUM RATED SPEED: 3000 FEET PER MINUTE FT
•
CASE STYLE: SQUARE
•
SEALING ELEMENT STYLE: ANGULAR
•
MATERIAL: STEEL CASE
•
ACCOMMODATED SHAFT DIAMETER: 3.375 INCHES NOMINAL IN
•
TEMP RATING: -30.0 FAHRENHEIT AND 300.0 FAHRENHEIT DEGF
•
HOUSING BORE DIAMETER: 4.381 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3000 FEET PER MINUTE FT
CASE STYLESQUARE
SEALING ELEMENT STYLEANGULAR
MATERIALSTEEL CASE
ACCOMMODATED SHAFT DIAMETER3.375 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
TEMP RATING-30.0 FAHRENHEIT AND 300.0 FAHRENHEIT DEGF
HOUSING BORE DIAMETER4.381 INCHES NOMINAL IN
SEAL WIDTH0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
1173588Interchangeable
interchangeable cross-reference
interchangeable
W205PPC3FS381AInterchangeable
interchangeable cross-reference
interchangeable
S3505Interchangeable
interchangeable cross-reference
interchangeable
M440Interchangeable
interchangeable cross-reference
interchangeable
125BInterchangeable
interchangeable cross-reference
interchangeable
432TInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 310525R91?
310525R91 is a SEAL,PLAIN ENCASED.
What parts can replace 310525R91?
There are 10 known substitutes for 310525R91: 1173588, W205PPC3FS381A, S3505 and 7 more. Substitute compatibility should be verified for your specific system.
Is 310525R91 still available?
310525R91 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