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Technical Data Sheet

M8791/1-128 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M8791/1-128: RETAINER,PACKING.

The RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL, joint_type: SCARF-PERIPHERAL INSERT, peripheral_diameter: 1.674 INCHES MINIMUM AND 1.680 INCHES MAXIMUM IN, center_hole_diameter: 1.504 INCHES MINIMUM AND 1.506 INCHES MAXIMUM IN, cross-sectional_height: 0.052 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN, cross-sectional_shape_style: SQUARE/RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-072-2200, 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
M8791/1-128
NSN: 5330-01-072-2200
NIINs: 010722200, 013814006
FSC: 5330 — Packing and Gasket Materials
CAGE: 5N582 — SEAL DYNAMICS LLC (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
joint_typeSCARF-PERIPHERAL INSERT
peripheral_diameter1.674 INCHES MINIMUM AND 1.680 INCHES MAXIMUM IN
center_hole_diameter1.504 INCHES MINIMUM AND 1.506 INCHES MAXIMUM IN
cross-sectional_height0.052 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationSAE-AS8791 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-072-2200
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M8791/1-128 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: 0.045 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE-AS8791 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR
•
CUT TYPE: DIAGONAL OVERALL
•
DEPARTURE FROM CITED DOCUMENT: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
•
PERIPHERAL DIAMETER: 1.627 INCHES MINIMUM IN
•
CENTER HOLE DIAMETER: 1.521 INCHES MINIMUM AND 1.523 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.045 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
CRITICALITY CODE JUSTIFICATIONZZZW
MATERIAL DOCUMENT AND CLASSIFICATIONSAE-AS8791 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
CUT TYPEDIAGONAL OVERALL
DEPARTURE FROM CITED DOCUMENTCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
PERIPHERAL DIAMETER1.627 INCHES MINIMUM IN
CENTER HOLE DIAMETER1.521 INCHES MINIMUM AND 1.523 INCHES MAXIMUM IN
MATERIALPLASTIC TETRAFLUOROETHYLENE OVERALL
JOINT TYPESCARF-PERIPHERAL OVERALL
SUBSTITUTES & CROSS-REFERENCES 8
PL2850-0020 FIND64CPReference document
Same NSN cross-reference
Reference document — Secondary reference
MS28774-128Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS28774-128CPReference document
Same NSN cross-reference
Reference document — Secondary reference
MS28774Reference document
Same NSN cross-reference
Reference document — Identification reference
910751Reference document
Same NSN cross-reference
Reference document — Secondary reference
910751CPReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M8791/1-128?
M8791/1-128 is a RETAINER,PACKING.
What parts can replace M8791/1-128?
There are 8 known substitutes for M8791/1-128: PL2850-0020 FIND64CP, MS28774-128, MS28774-128CP and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M8791/1-128?
M8791/1-128 is cataloged in the U.S. Government catalog under NSN 5330-01-072-2200. 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.