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B43764 ✓ 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: STEEL CORROSION RESISTING CASE, case_style: SQUARE, seal_width: 1.000 INCHES NOMINAL IN, housing_bore_diameter: 5.905 INCHES NOMINAL IN, sealing_element_style: ANGULAR, end_item_identification: 2320-01-452-5579;TRUCK TRACTOR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-509-1521, 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
B43764
NSN: 5330-01-509-1521
FSC: 5330
CAGE: 4GJA3 — BOSS SEALS, LLC DIV CLARK SEALS LTD (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING CASE
case_styleSQUARE
seal_width1.000 INCHES NOMINAL IN
housing_bore_diameter5.905 INCHES NOMINAL IN
sealing_element_styleANGULAR
end_item_identification2320-01-452-5579;TRUCK TRACTOR
accommodated_shaft_diameter4.375 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencySEAL;OIL-STEMCO SS4 FOR EFA-20/FL-941
NSN5330-01-509-1521
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B43764 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
•
SEAL WIDTH: 1.000 INCHES NOMINAL IN
•
ACCOMMODATED SHAFT DIAMETER: 4.375 INCHES NOMINAL IN
•
HOUSING BORE DIAMETER: 5.905 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING SPRING
•
CASE STYLE: SQUARE
•
SEALING ELEMENT STYLE: ANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
SEAL WIDTH1.000 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYSEAL;OIL-STEMCO SS4 FOR EFA-20/FL-941
ACCOMMODATED SHAFT DIAMETER4.375 INCHES NOMINAL IN
HOUSING BORE DIAMETER5.905 INCHES NOMINAL IN
MATERIALSTEEL CORROSION RESISTING SPRING
CASE STYLESQUARE
SEALING ELEMENT STYLEANGULAR
END ITEM IDENTIFICATION2320-01-452-5579;TRUCK TRACTOR
MATERIALSTEEL CORROSION RESISTING CASE
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEALING ELEMENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
7031Interchangeable
interchangeable cross-reference
interchangeable
07031.0000Interchangeable
interchangeable cross-reference
interchangeable
SM1009-01Interchangeable
interchangeable cross-reference
interchangeable
SM1009Interchangeable
interchangeable cross-reference
interchangeable
D-734Interchangeable
interchangeable cross-reference
interchangeable
CV292Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B43764?
B43764 is a SEAL,PLAIN ENCASED.
What parts can replace B43764?
There are 19 known substitutes for B43764: 7031, 07031.0000, SM1009-01 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B43764?
B43764 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-509-1521. 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