PartsTable
Technical Data Sheet
TYPE1SIZE51 ✓ 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: 3.078 INCHES NOMINAL IN, closed_end_overall_diameter: 2.995 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7229, 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
TYPE1SIZE51
NSN: 5340-00-290-7229
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialPLASTIC
length_under_shoulder0.750 INCHES NOMINAL IN
open_end_inside_diameter3.078 INCHES NOMINAL IN
closed_end_overall_diameter2.995 INCHES NOMINAL IN
NSN5340-00-290-7229
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: TYPE1SIZE51 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
OPEN END INSIDE DIAMETER: 3.078 INCHES NOMINAL IN
LENGTH UNDER SHOULDER: 0.750 INCHES NOMINAL IN
MATERIAL: PLASTIC
CLOSED END OVERALL DIAMETER: 2.995 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OPEN END INSIDE DIAMETER3.078 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.750 INCHES NOMINAL IN
MATERIALPLASTIC
CLOSED END OVERALL DIAMETER2.995 INCHES NOMINAL IN
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 TYPE1SIZE51?
TYPE1SIZE51 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace TYPE1SIZE51?
There are 24 known substitutes for TYPE1SIZE51: MILC52078, RU51089, 28901-17 and 21 more. Substitute compatibility should be verified for your specific system.
Is TYPE1SIZE51 still available?
TYPE1SIZE51 is currently cancelled.
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