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361SL18 ✓ 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: SPLIT, end_diameter: 1.1250 INCHES NOMINAL IN, bore_diameter: 1.1250 INCHES NOMINAL IN, overall_height: 0.2500 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 5340-00-734-9687, 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
361SL18
NSN: 5340-00-734-9687
FSC: 5340
CAGE: 76040 — MACK TRUCKS INC PARTS OPN (USA)
SPECIFICATIONS
materialSTEEL
design_typeSPLIT
end_diameter1.1250 INCHES NOMINAL IN
bore_diameter1.1250 INCHES NOMINAL IN
overall_height0.2500 INCHES NOMINAL IN
style_designatorSEAT
surface_treatmentCADMIUM
first_step_diameter1.1870 INCHES NOMINAL IN
distance_from_end_to_first_step0.2180 INCHES NOMINAL IN
NSN5340-00-734-9687
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 361SL18 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
•
DESIGN TYPE: SPLIT
•
END DIAMETER: 1.1250 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.2180 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SEAT
•
MATERIAL: STEEL
•
SURFACE TREATMENT: CADMIUM
•
BORE DIAMETER: 1.1250 INCHES NOMINAL IN
•
FIRST STEP DIAMETER: 1.1870 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DESIGN TYPESPLIT
END DIAMETER1.1250 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.2180 INCHES NOMINAL IN
STYLE DESIGNATORSEAT
MATERIALSTEEL
SURFACE TREATMENTCADMIUM
BORE DIAMETER1.1250 INCHES NOMINAL IN
FIRST STEP DIAMETER1.1870 INCHES NOMINAL IN
OVERALL HEIGHT0.2500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
251-010Interchangeable
interchangeable cross-reference
interchangeable
2N3055Interchangeable
interchangeable cross-reference
interchangeable
2489900420380Interchangeable
interchangeable cross-reference
interchangeable
10135246Interchangeable
interchangeable cross-reference
interchangeable
404709Interchangeable
interchangeable cross-reference
interchangeable
5248453Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 361SL18?
361SL18 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 361SL18?
There are 16 known substitutes for 361SL18: 251-010, 2N3055, 2489900420380 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 361SL18?
361SL18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-734-9687. 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