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RU51088 ✓ 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: 0.750 INCHES NOMINAL IN, open_end_inside_diameter: 1.027 INCHES NOMINAL IN, closed_end_overall_diameter: 0.094 INCHES NOMINAL IN, nondefinitive_spec/std_data: 1 TYPE AND 22 SIZE, departure_from_cited_document: MIL-C-52078. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7215, 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
RU51088
NSN: 5340-00-290-7215
FSC: 5340
CAGE: K0680 — ROLLS-ROYCE AIRLINES (GBR)
SPECIFICATIONS
materialPLASTIC
length_under_shoulder0.750 INCHES NOMINAL IN
open_end_inside_diameter1.027 INCHES NOMINAL IN
closed_end_overall_diameter0.094 INCHES NOMINAL IN
nondefinitive_spec/std_data1 TYPE AND 22 SIZE
departure_from_cited_documentMIL-C-52078
NSN5340-00-290-7215
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RU51088 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
•
MATERIAL: PLASTIC
•
OPEN END INSIDE DIAMETER: 1.027 INCHES NOMINAL IN
•
DEPARTURE FROM CITED DOCUMENT: MIL-C-52078
•
LENGTH UNDER SHOULDER: 0.750 INCHES NOMINAL IN
•
CLOSED END OVERALL DIAMETER: 0.094 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 22 SIZE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC
OPEN END INSIDE DIAMETER1.027 INCHES NOMINAL IN
DEPARTURE FROM CITED DOCUMENTMIL-C-52078
LENGTH UNDER SHOULDER0.750 INCHES NOMINAL IN
CLOSED END OVERALL DIAMETER0.094 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 22 SIZE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
MILC52078Upgraded Successor
successor cross-reference
successor
RU51089Upgraded Successor
successor cross-reference
successor
28901-17Upgraded Successor
successor cross-reference
successor
21Upgraded Successor
successor cross-reference
successor
MIL-C-5501Upgraded Successor
successor cross-reference
successor
57AUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RU51088?
RU51088 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace RU51088?
There are 24 known substitutes for RU51088: MILC52078, RU51089, 28901-17 and 21 more. Substitute compatibility should be verified for your specific system.
Is RU51088 still available?
RU51088 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