PartsTable
Technical Data Sheet
Download PDF

5223918 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5223918: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: STEEL, design_type: FRICTION, overall_diameter: 2.080 INCHES NOMINAL IN, surface_treatment: PHOSPHATE, fsc_application_data: MOUNT,GUN,TWIN,40MM,M4E1 MM, inside_diameter_length: 0.675 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-522-3918, 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
5223918
NSN: 5340-00-522-3918
FSC: 5340 — Hardware, Commercial
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL
design_typeFRICTION
overall_diameter2.080 INCHES NOMINAL IN
surface_treatmentPHOSPHATE
fsc_application_dataMOUNT,GUN,TWIN,40MM,M4E1 MM
inside_diameter_length0.675 INCHES NOMINAL IN
round_cap_outside_surface_conditionSMOOTH
opening_inside_diameter_for_which_designed2.046 INCHES NOMINAL IN
NSN5340-00-522-3918
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5223918 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
•
FSC APPLICATION DATA: MOUNT,GUN,TWIN,40MM,M4E1 MM
•
DESIGN TYPE: FRICTION
•
OVERALL DIAMETER: 2.080 INCHES NOMINAL IN
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 2.046 INCHES NOMINAL IN
•
SURFACE TREATMENT: PHOSPHATE
•
MATERIAL: STEEL
•
INSIDE DIAMETER LENGTH: 0.675 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: SMOOTH
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATAMOUNT,GUN,TWIN,40MM,M4E1 MM
DESIGN TYPEFRICTION
OVERALL DIAMETER2.080 INCHES NOMINAL IN
OPENING INSIDE DIAMETER FOR WHICH DESIGNED2.046 INCHES NOMINAL IN
SURFACE TREATMENTPHOSPHATE
MATERIALSTEEL
INSIDE DIAMETER LENGTH0.675 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONSMOOTH
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 5223918?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 5223918?
5223918 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for 5223918?
5223918 is cataloged in the U.S. Government catalog under NSN 5340-00-522-3918. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 5223918

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.