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SIZE20S ✓ 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: 0.375 INCHES NOMINAL IN, open_end_inside_diameter: 1.762 INCHES NOMINAL IN, closed_end_overall_diameter: 1.800 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 5340-00-290-7248, 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
SIZE20S
NSN: 5340-00-290-7248
FSC: 5340
CAGE: 95760 — PROTECTIVE CLOSURES CO INC (USA)
SPECIFICATIONS
materialPLASTIC
length_under_shoulder0.375 INCHES NOMINAL IN
open_end_inside_diameter1.762 INCHES NOMINAL IN
closed_end_overall_diameter1.800 INCHES NOMINAL IN
NSN5340-00-290-7248
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SIZE20S 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: 1.762 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.375 INCHES NOMINAL IN
•
CLOSED END OVERALL DIAMETER: 1.800 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC
OPEN END INSIDE DIAMETER1.762 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.375 INCHES NOMINAL IN
CLOSED END OVERALL DIAMETER1.800 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SIZE20S?
SIZE20S is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace SIZE20S?
There are 25 known substitutes for SIZE20S: MILC52078, RU51089, 28901-17 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SIZE20S?
SIZE20S is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7248. 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