PartsTable
Technical Data Sheet
4B9371 ✓ 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 color: BLACK, material: RUBBER SYNTHETIC SEALING ELEMENT B, case_style: SQUARE, seal_width: 0.437 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, temp_rating: -40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF, hardness_rating: 80.0 SHORE DUROMETER A NOMINAL OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-641-2069, 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
4B9371
NSN: 5330-00-641-2069
FSC: 5330
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
colorBLACK
materialRUBBER SYNTHETIC SEALING ELEMENT B
case_styleSQUARE
seal_width0.437 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
temp_rating-40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
hardness_rating80.0 SHORE DUROMETER A NOMINAL OVERALL
housing_bore_diameter4.999 INCHES NOMINAL IN
sealing_element_styleANGULAR
maximum_pressure_rating7.0 POUNDS PER SQUARE INCH (PSI) LBS
accommodated_shaft_diameter3.500 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed2000 FEET PER MINUTE FT
NSN5330-00-641-2069
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4B9371 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: 2000 FEET PER MINUTE FT
ACCOMMODATED SHAFT DIAMETER: 3.500 INCHES NOMINAL IN
TEMP RATING: -40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
SEAL WIDTH: 0.437 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
HARDNESS RATING: 80.0 SHORE DUROMETER A NOMINAL OVERALL
CASE STYLE: SQUARE
HOUSING BORE DIAMETER: 4.999 INCHES NOMINAL IN
COLOR: BLACK
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2000 FEET PER MINUTE FT
ACCOMMODATED SHAFT DIAMETER3.500 INCHES NOMINAL IN
TEMP RATING-40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
SEAL WIDTH0.437 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
HARDNESS RATING80.0 SHORE DUROMETER A NOMINAL OVERALL
CASE STYLESQUARE
HOUSING BORE DIAMETER4.999 INCHES NOMINAL IN
COLORBLACK
MATERIALRUBBER SYNTHETIC SEALING ELEMENT B
MATERIALLEATHER SEALING ELEMENT A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
2378Interchangeable
interchangeable cross-reference
interchangeable
M112-00Interchangeable
interchangeable cross-reference
interchangeable
M112Interchangeable
interchangeable cross-reference
interchangeable
A2104Interchangeable
interchangeable cross-reference
interchangeable
MS17162Interchangeable
interchangeable cross-reference
interchangeable
B4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4B9371?
4B9371 is a SEAL,PLAIN ENCASED.
What parts can replace 4B9371?
There are 22 known substitutes for 4B9371: 2378, M112-00, M112 and 19 more. Substitute compatibility should be verified for your specific system.
Is 4B9371 still available?
4B9371 is currently cancelled.
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