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Technical Data Sheet
M8791/1-131CP ✓ 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 M8791/1-131CP is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-334-3660, 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
M8791/1-131CP
NSN: 5330-01-334-3660
FSC: 5330
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
Part NumberM8791/1-131CP
NSN5330-01-334-3660
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M8791/1-131CP 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 SHAPE STYLE: SQUARE/RECTANGULAR
CROSS-SECTIONAL HEIGHT: 0.052 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
JOINT TYPE: SCARF-PERIPHERAL OVERALL
CRITICALITY CODE JUSTIFICATION: ZZZW
DEPARTURE FROM CITED DOCUMENT: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
MATERIAL: PLASTIC TETRAFLUOROETHYLENE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-8791/1-131 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE DIAMETER: 1.689 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
CROSS-SECTIONAL HEIGHT0.052 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
JOINT TYPESCARF-PERIPHERAL OVERALL
CRITICALITY CODE JUSTIFICATIONZZZW
DEPARTURE FROM CITED DOCUMENTCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
MATERIALPLASTIC TETRAFLUOROETHYLENE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-8791/1-131 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE DIAMETER1.689 INCHES NOMINAL IN
PERIPHERAL DIAMETER1.859 INCHES MINIMUM AND 1.863 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
MIL-R-8791/1-133Interchangeable
interchangeable cross-reference
interchangeable
MS28774-133CPInterchangeable
interchangeable cross-reference
interchangeable
5330PL2126036Interchangeable
interchangeable cross-reference
interchangeable
M8791/1-133Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS8791/1Interchangeable
interchangeable cross-reference
interchangeable
M8791/1-131Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M8791/1-131CP?
M8791/1-131CP is a M8791/1-131CP.
What parts can replace M8791/1-131CP?
There are 8 known substitutes for M8791/1-131CP: MIL-R-8791/1-133, MS28774-133CP, 5330PL2126036 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M8791/1-131CP?
M8791/1-131CP is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-334-3660. This indicates validated use in U.S. government and defense supply chains.
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