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18902 PC3 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

18902 PC3: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: COPPER ALLOY, design_type: FRICTION, overall_diameter: 1.600 INCHES NOMINAL IN, special_features: MILITARY CRITICAL, EXPORT CONTROL; PHOS BRONZE; HAS KEY SLOT, inside_diameter_length: 0.300 INCHES NOMINAL IN, end_item_identification: MK11 40MM SALUTING, MOUNT MM. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-556-2018, 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
18902 PC3
NSN: 5340-01-556-2018
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY
design_typeFRICTION
overall_diameter1.600 INCHES NOMINAL IN
special_featuresMILITARY CRITICAL, EXPORT CONTROL; PHOS BRONZE; HAS KEY SLOT
inside_diameter_length0.300 INCHES NOMINAL IN
end_item_identificationMK11 40MM SALUTING, MOUNT MM
criticality_code_justificationFEAT
round_cap_outside_surface_conditionSMOOTH
part_name_assigned_by_controlling_agencyGIB
opening_inside_diameter_for_which_designed1.400 INCHES NOMINAL IN
NSN5340-01-556-2018
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 18902 PC3 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
•
DESIGN TYPE: FRICTION
•
OVERALL DIAMETER: 1.600 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 1.400 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER1.600 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONFEAT
OPENING INSIDE DIAMETER FOR WHICH DESIGNED1.400 INCHES NOMINAL IN
SPECIAL FEATURESMILITARY CRITICAL, EXPORT CONTROL; PHOS BRONZE; HAS KEY SLOT
PART NAME ASSIGNED BY CONTROLLING AGENCYGIB
END ITEM IDENTIFICATIONMK11 40MM SALUTING, MOUNT MM
MATERIALCOPPER ALLOY
INSIDE DIAMETER LENGTH0.300 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 18902 PC3?
18902 PC3 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for 18902 PC3?
18902 PC3 is cataloged in the U.S. Government catalog under NSN 5340-01-556-2018. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.