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4491K71 — PLUG,PROTECTIVE,DUST AND MOISTUR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4491K71: PLUG,PROTECTIVE,DUST AND MOISTUR.

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: PLASTIC, POLYETHYLENE (PP), design_type: FRICTION, special_features: QUANITY 100;LARGE END 1.600 INCH;SMALL END 1.513 INCH;HGT .500 INCH;TEMP RANGE -94 TO +150 DEGREES F;COLOR ISRED IN, end_item_identification: FOR NPT THREADED FITTINGS, part_name_assigned_by_controlling_agency: PLUG 1-1/4IN IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-553-7970, 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
4491K71
NSN: 5340-01-553-7970
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeFRICTION
special_featuresQUANITY 100;LARGE END 1.600 INCH;SMALL END 1.513 INCH;HGT .500 INCH;TEMP RANGE -94 TO +150 DEGREES F;COLOR ISRED IN
end_item_identificationFOR NPT THREADED FITTINGS
part_name_assigned_by_controlling_agencyPLUG 1-1/4IN IN
NSN5340-01-553-7970
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4491K71 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
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
SPECIAL FEATURESQUANITY 100;LARGE END 1.600 INCH;SMALL END 1.513 INCH;HGT .500 INCH;TEMP RANGE -94 TO +150 DEGREES F;COLOR ISRED IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPLUG 1-1/4IN IN
END ITEM IDENTIFICATIONFOR NPT THREADED FITTINGS
MATERIALPLASTIC, POLYETHYLENE (PP)
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
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FREQUENTLY ASKED QUESTIONS
What is 4491K71?
4491K71 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What is the NSN for 4491K71?
4491K71 is cataloged in the U.S. Government catalog under NSN 5340-01-553-7970. 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.