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SIZE43A ✓ 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: 1.000 INCHES NOMINAL IN, open_end_inside_diameter: 2.688 INCHES NOMINAL IN, closed_end_overall_diameter: 2.457 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7263, 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
SIZE43A
NSN: 5340-00-290-7263
FSC: 5340
CAGE: 95760 — PROTECTIVE CLOSURES CO INC (USA)
SPECIFICATIONS
materialPLASTIC
length_under_shoulder1.000 INCHES NOMINAL IN
open_end_inside_diameter2.688 INCHES NOMINAL IN
closed_end_overall_diameter2.457 INCHES NOMINAL IN
NSN5340-00-290-7263
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SIZE43A 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
•
LENGTH UNDER SHOULDER: 1.000 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 2.688 INCHES NOMINAL IN
•
CLOSED END OVERALL DIAMETER: 2.457 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC
LENGTH UNDER SHOULDER1.000 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER2.688 INCHES NOMINAL IN
CLOSED END OVERALL DIAMETER2.457 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
102C1279-1Upgraded Successor
successor cross-reference
successor
8028447Upgraded Successor
successor cross-reference
successor
353122-4Upgraded Successor
successor cross-reference
successor
MILC52078Upgraded Successor
successor cross-reference
successor
22SUpgraded Successor
successor cross-reference
successor
M5501/7-F38Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SIZE43A?
SIZE43A is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace SIZE43A?
There are 32 known substitutes for SIZE43A: 102C1279-1, 8028447, 353122-4 and 29 more. Substitute compatibility should be verified for your specific system.
Is SIZE43A still available?
SIZE43A 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