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6448K46 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6448K46: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: RUBBER SYNTHETIC, design_type: FRICTION, overall_height: 1.000 INCHES NOMINAL IN, end_item_identification: MK 109 MOD 1, round_cap_outside_surface_condition: SMOOTH, part_name_assigned_by_controlling_agency: PUSH-ON RUBBER CAP. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-640-6603, 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
6448K46
NSN: 5340-01-640-6603
FSC: 5340 — Hardware, Commercial
CAGE: 2V507 — MCMASTER-CARR SUPPLY COMPANY (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
design_typeFRICTION
overall_height1.000 INCHES NOMINAL IN
special_featuresMATERIAL IS EPDM;HEIGHT LISTED IS INSIDE HEIGHT;COLOR IS BLCK;DUROMETER IS 40A-70A;CHEMICAL RESISTANT;MAX TEMPERATURE IS 200.0 DEGREES F A
end_item_identificationMK 109 MOD 1
round_cap_outside_surface_conditionSMOOTH
part_name_assigned_by_controlling_agencyPUSH-ON RUBBER CAP
opening_inside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN5340-01-640-6603
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6448K46 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
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
ROUND CAP OUTSIDE SURFACE CONDITION: SMOOTH
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.000 INCHES NOMINAL IN
DESIGN TYPEFRICTION
OPENING INSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
SPECIAL FEATURESMATERIAL IS EPDM;HEIGHT LISTED IS INSIDE HEIGHT;COLOR IS BLCK;DUROMETER IS 40A-70A;CHEMICAL RESISTANT;MAX TEMPERATURE IS 200.0 DEGREES F A
PART NAME ASSIGNED BY CONTROLLING AGENCYPUSH-ON RUBBER CAP
END ITEM IDENTIFICATIONMK 109 MOD 1
MATERIALRUBBER SYNTHETIC
ROUND CAP OUTSIDE SURFACE CONDITIONSMOOTH
SUBSTITUTES & CROSS-REFERENCES 1
6448K77Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 6448K46?
6448K46 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 6448K46?
There is 1 known substitute for 6448K46: 6448K77. Substitute compatibility should be verified for your specific system.
What is the NSN for 6448K46?
6448K46 is cataloged in the U.S. Government catalog under NSN 5340-01-640-6603. 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.