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RU51085 ✓ 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 length_under_shoulder: 0.875 INCHES NOMINAL IN, open_end_inside_diameter: 1.402 INCHES NOMINAL IN, closed_end_overall_diameter: 1.312 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7249, 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
RU51085
NSN: 5340-00-290-7249
FSC: 5340
CAGE: K0680 — ROLLS-ROYCE AIRLINES (GBR)
SPECIFICATIONS
length_under_shoulder0.875 INCHES NOMINAL IN
open_end_inside_diameter1.402 INCHES NOMINAL IN
closed_end_overall_diameter1.312 INCHES NOMINAL IN
NSN5340-00-290-7249
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RU51085 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
•
LENGTH UNDER SHOULDER: 0.875 INCHES NOMINAL IN
•
CLOSED END OVERALL DIAMETER: 1.312 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 1.402 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
LENGTH UNDER SHOULDER0.875 INCHES NOMINAL IN
CLOSED END OVERALL DIAMETER1.312 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER1.402 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
MILC52078Upgraded Successor
successor cross-reference
successor
22SUpgraded Successor
successor cross-reference
successor
M5501/7-F38Upgraded Successor
successor cross-reference
successor
M5501/1-R6Upgraded Successor
successor cross-reference
successor
MILC5501Upgraded Successor
successor cross-reference
successor
MIL-C-5501/1Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RU51085?
RU51085 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace RU51085?
There are 31 known substitutes for RU51085: MILC52078, 22S, M5501/7-F38 and 28 more. Substitute compatibility should be verified for your specific system.
Is RU51085 still available?
RU51085 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026