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RU51090 ✓ 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

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: PLASTIC, length_under_shoulder: 0.630 INCHES NOMINAL IN, open_end_inside_diameter: 0.868 INCHES NOMINAL IN, closed_end_overall_diameter: 0.815 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-826-5696, 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
RU51090
NSN: 5340-00-826-5696
FSC: 5340
CAGE: K0680 — ROLLS-ROYCE AIRLINES (GBR)
SPECIFICATIONS
materialPLASTIC
length_under_shoulder0.630 INCHES NOMINAL IN
open_end_inside_diameter0.868 INCHES NOMINAL IN
closed_end_overall_diameter0.815 INCHES NOMINAL IN
NSN5340-00-826-5696
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RU51090 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
•
CLOSED END OVERALL DIAMETER: 0.815 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 0.868 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
•
LENGTH UNDER SHOULDER: 0.630 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CLOSED END OVERALL DIAMETER0.815 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER0.868 INCHES NOMINAL IN
MATERIALPLASTIC
LENGTH UNDER SHOULDER0.630 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
S47-036Interchangeable
interchangeable cross-reference
interchangeable
2805Interchangeable
interchangeable cross-reference
interchangeable
18X2Interchangeable
interchangeable cross-reference
interchangeable
04-1409Interchangeable
interchangeable cross-reference
interchangeable
11XInterchangeable
interchangeable cross-reference
interchangeable
NDC63104-0000-11Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RU51090?
RU51090 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace RU51090?
There are 6 known substitutes for RU51090: S47-036, 2805, 18X2 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RU51090?
RU51090 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-826-5696. 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