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4D1577 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4D1577: O-RING.

The O-RING is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5331-00-081-3139, 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
4D1577
NSN: 5331-00-081-3139
FSC: 5331 — O-ring
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
Part Number4D1577
NSN5331-00-081-3139
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4D1577 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
SUBSTITUTES & CROSS-REFERENCES 6
AS568-281Reference document
Same NSN cross-reference
Reference document — Secondary reference
281Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
0-2-3-7Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
115657176FN39Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
115657175FN39Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2-281-N674-70Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4D1577?
4D1577 is a O-RING.
What parts can replace 4D1577?
There are 6 known substitutes for 4D1577: AS568-281, 281, 0-2-3-7 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4D1577?
4D1577 is cataloged in the U.S. Government catalog under NSN 5331-00-081-3139. 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.