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218-7377 — RING,EXTERNALLY THREADED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

218-7377: RING,EXTERNALLY THREADED.

The RING,EXTERNALLY THREADED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8740, surface_treatment: SILVER, end_item_identification: J52 ENGINE. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-070-2000, 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
218-7377
NSN: 5331-00-070-2000
NIINs: 000702000, 013563398
FSC: 5331 — O-ring
CAGE: 25184 — PARKER HANNIFIN CORPORATION DIV O-RING DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 8740
surface_treatmentSILVER
end_item_identificationJ52 ENGINE
NSN5331-00-070-2000
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 218-7377 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.228 INCHES MINIMUM AND 1.240 INCHES MAXIMUM IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.228 INCHES MINIMUM AND 1.240 INCHES MAXIMUM IN
MATERIALRUBBER
SUBSTITUTES & CROSS-REFERENCES 1
576R618H06Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 218-7377?
218-7377 is a RING,EXTERNALLY THREADED.
What parts can replace 218-7377?
There is 1 known substitute for 218-7377: 576R618H06. Substitute compatibility should be verified for your specific system.
What is the NSN for 218-7377?
218-7377 is cataloged in the U.S. Government catalog under NSN 5331-00-070-2000. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.