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4491K12 — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4491K12 is CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: PLASTIC, POLYETHYLENE (PP), special_features: FOR HYDRAULIC FITTINGS 5/16-24, length_under_shoulder: 0.375 INCHES NOMINAL IN, closed_end_overall_diameter: 0.235 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-577-5743, 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
4491K12
NSN: 5340-01-577-5743
FSC: 5340 — Hardware, Commercial
CAGE: 07BY4 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
special_featuresFOR HYDRAULIC FITTINGS 5/16-24
length_under_shoulder0.375 INCHES NOMINAL IN
closed_end_overall_diameter0.235 INCHES NOMINAL IN
NSN5340-01-577-5743
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4491K12 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
•
CLOSED END OVERALL DIAMETER: 0.235 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.375 INCHES NOMINAL IN
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
TECHNICAL CHARACTERISTICS
CLOSED END OVERALL DIAMETER0.235 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.375 INCHES NOMINAL IN
SPECIAL FEATURESFOR HYDRAULIC FITTINGS 5/16-24
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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4491K12?
4491K12 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What is the NSN for 4491K12?
4491K12 is cataloged in the U.S. Government catalog under NSN 5340-01-577-5743. 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.