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Technical Data Sheet
MS9970-256 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER FLUOROCARBON CLASS FPM, center_hole_diameter: 4.711 INCHES MINIMUM AND 5.757 INCHES MAXIMUM IN, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN, material_document_and_classification: AMS7279 ASSN STD SINGLE MATERIAL RESPONSE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-377-8615, 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
MS9970-256
NSN: 5331-01-377-8615
FSC: 5331 — O-RING
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER FLUOROCARBON CLASS FPM
center_hole_diameter4.711 INCHES MINIMUM AND 5.757 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
material_document_and_classificationAMS7279 ASSN STD SINGLE MATERIAL RESPONSE
NSN5331-01-377-8615
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS9970-256 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
CENTER HOLE DIAMETER: 4.711 INCHES MINIMUM AND 5.757 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION: AMS7279 ASSN STD SINGLE MATERIAL RESPONSE
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER4.711 INCHES MINIMUM AND 5.757 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS7279 ASSN STD SINGLE MATERIAL RESPONSE
MATERIALRUBBER FLUOROCARBON CLASS FPM
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
AS568-256Interchangeable
interchangeable cross-reference
interchangeable
611980-4Interchangeable
interchangeable cross-reference
interchangeable
M83248/2-256Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS9970-256?
MS9970-256 is a O-RING.
What parts can replace MS9970-256?
There are 3 known substitutes for MS9970-256: AS568-256, 611980-4, M83248/2-256. Substitute compatibility should be verified for your specific system.
What is the NSN for MS9970-256?
MS9970-256 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-377-8615. This indicates validated use in U.S. government and defense supply chains.
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