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Technical Data Sheet
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MS29561-240 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MS29561-240: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include part_name_assigned_by_controlling_agency: PACKING,PREFORMED,O-RING,SYNTHETIC LUBRICANT RESISTANT.. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-725-0758, 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
MS29561-240
NSN: 5331-00-725-0758
NIINs: 007250758, 016237027
FSC: 5331 — O-ring
CAGE: AC910 — AERTEKNO S.R.L. (ITA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyPACKING,PREFORMED,O-RING,SYNTHETIC LUBRICANT RESISTANT.
NSN5331-00-725-0758
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS29561-240 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 4.012 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 250 MAXIMUM
•
CENTER HOLE DIAMETER: 3.719 INCHES MINIMUM AND 3.749 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
OUTSIDE DIAMETER4.012 INCHES NOMINAL IN
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE250 MAXIMUM
CENTER HOLE DIAMETER3.719 INCHES MINIMUM AND 3.749 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
SUBSTITUTES & CROSS-REFERENCES 3
SAE-AS29561Reference document
Same NSN cross-reference
Reference document — Secondary reference
2-240 N4771-70Reference document
Same NSN cross-reference
Reference document — Secondary reference
2-240 47-071Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedAcquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS29561-240?
MS29561-240 is a O-RING.
What parts can replace MS29561-240?
There are 3 known substitutes for MS29561-240: SAE-AS29561, 2-240 N4771-70, 2-240 47-071. Substitute compatibility should be verified for your specific system.
What is the NSN for MS29561-240?
MS29561-240 is cataloged in the U.S. Government catalog under NSN 5331-00-725-0758. 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.