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B48348 ✓ 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

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.5840 INCHES NOMINAL IN, bore_diameter: 0.4900 INCHES NOMINAL IN, overall_height: 0.5020 INCHES NOMINAL IN, style_designator: SEAT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-124-6989, 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
B48348
NSN: 5340-00-124-6989
FSC: 5340
CAGE: 88907 — BRUNSWICK CORP DBA MERCURY MARINE DIV MERCURY MARINE (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.5840 INCHES NOMINAL IN
bore_diameter0.4900 INCHES NOMINAL IN
overall_height0.5020 INCHES NOMINAL IN
style_designatorSEAT
bore_taper_in_deg6.0
first_step_length0.1250 INCHES NOMINAL IN
seat_angle_in_deg12.0
first_step_diameter0.7500 INCHES NOMINAL IN
second_end_diameter0.7950 INCHES NOMINAL IN
chamfer_angle_in_deg12.0
NSN5340-00-124-6989
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B48348 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
•
CHAMFER ANGLE IN DEG: 12.0
•
FIRST STEP DIAMETER: 0.7500 INCHES NOMINAL IN
•
BORE DIAMETER: 0.4900 INCHES NOMINAL IN
•
SECOND STEP DIAMETER: 1.1940 INCHES NOMINAL IN
•
BORE TAPER IN DEG: 6.0
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
SEAT ANGLE IN DEG: 12.0
TECHNICAL CHARACTERISTICS (FLIS)
CHAMFER ANGLE IN DEG12.0
FIRST STEP DIAMETER0.7500 INCHES NOMINAL IN
BORE DIAMETER0.4900 INCHES NOMINAL IN
SECOND STEP DIAMETER1.1940 INCHES NOMINAL IN
BORE TAPER IN DEG6.0
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SEAT ANGLE IN DEG12.0
END DIAMETER0.5840 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.2520 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
389693-4Interchangeable
interchangeable cross-reference
interchangeable
99821Interchangeable
interchangeable cross-reference
interchangeable
3-737Interchangeable
interchangeable cross-reference
interchangeable
TMT-99-821Interchangeable
interchangeable cross-reference
interchangeable
48348Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B48348?
B48348 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace B48348?
There are 5 known substitutes for B48348: 389693-4, 99821, 3-737 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B48348?
B48348 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-124-6989. 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