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639AS5157 — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

639AS5157: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: ALUMINUM ALLOY 6061, open_end_inside_diameter: 4.4995 INCHES MINIMUM AND 4.5005 INCHES MAXIMUM IN, closed_end_overall_diameter: 4.780 INCHES NOMINAL IN, material_document_and_classification: QQ-A-225/8, ALLOY 6061-T6 FED SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-221-5853, 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
639AS5157
NSN: 5340-01-221-5853
FSC: 5340 — Hardware, Commercial
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061
open_end_inside_diameter4.4995 INCHES MINIMUM AND 4.5005 INCHES MAXIMUM IN
closed_end_overall_diameter4.780 INCHES NOMINAL IN
material_document_and_classificationQQ-A-225/8, ALLOY 6061-T6 FED SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-221-5853
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 639AS5157 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: 4.780 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/8, ALLOY 6061-T6 FED SPEC SINGLE MATERIAL RESPONSE
•
OPEN END INSIDE DIAMETER: 4.4995 INCHES MINIMUM AND 4.5005 INCHES MAXIMUM IN
•
MATERIAL: ALUMINUM ALLOY 6061
TECHNICAL CHARACTERISTICS
CLOSED END OVERALL DIAMETER4.780 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/8, ALLOY 6061-T6 FED SPEC SINGLE MATERIAL RESPONSE
OPEN END INSIDE DIAMETER4.4995 INCHES MINIMUM AND 4.5005 INCHES MAXIMUM IN
MATERIALALUMINUM ALLOY 6061
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 639AS5157?
639AS5157 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What is the NSN for 639AS5157?
639AS5157 is cataloged in the U.S. Government catalog under NSN 5340-01-221-5853. 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.