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Technical Data Sheet
MS9021D-020 ✓ 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 BUTADIENE-ACRYLONITRILE CLASS NBR, center_hole_diameter: 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN, cross-sectional_height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN, material_document_and_classification: AMS7271-80 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 5331-01-388-3987, 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
MS9021D-020
NSN: 5331-01-388-3987
FSC: 5331 — O-RING
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
center_hole_diameter0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
material_document_and_classificationAMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE
NSN5331-01-388-3987
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS9021D-020 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
MATERIAL DOCUMENT AND CLASSIFICATION: AMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE
CENTER HOLE DIAMETER: 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE
CENTER HOLE DIAMETER0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
AS3578-020Interchangeable
interchangeable cross-reference
interchangeable
PRP568-020-4024-65Interchangeable
interchangeable cross-reference
interchangeable
29822-96Interchangeable
interchangeable cross-reference
interchangeable
AS568-020Interchangeable
interchangeable cross-reference
interchangeable
MS9021-020Interchangeable
interchangeable cross-reference
interchangeable
5331PL1241454Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS9021D-020?
MS9021D-020 is a O-RING.
What parts can replace MS9021D-020?
There are 7 known substitutes for MS9021D-020: AS3578-020, PRP568-020-4024-65, 29822-96 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS9021D-020?
MS9021D-020 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-388-3987. This indicates validated use in U.S. government and defense supply chains.
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