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Technical Data Sheet

M8791/1-120 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M8791/1-120: 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: 1.172 INCHES MINIMUM AND 1.178 INCHES MAXIMUM IN, center_hole_diameter: 1.002 INCHES MINIMUM AND 1.004 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 5330-01-020-9508, 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
M8791/1-120
NSN: 5330-01-020-9508
NIINs: 010209508, 013523133
FSC: 5330 — Packing and Gasket Materials
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
joint_typeSCARF-PERIPHERAL INSERT
peripheral_diameter1.172 INCHES MINIMUM AND 1.178 INCHES MAXIMUM IN
center_hole_diameter1.002 INCHES MINIMUM AND 1.004 INCHES MAXIMUM IN
cross-sectional_height0.052 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationAS8791 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-020-9508
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M8791/1-120 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: 1.183 INCHES MINIMUM AND 1.189 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.013 INCHES MINIMUM AND 1.015 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 DIAMETER1.183 INCHES MINIMUM AND 1.189 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.013 INCHES MINIMUM AND 1.015 INCHES MAXIMUM IN
MATERIALPLASTIC TETRAFLUOROETHYLENE OVERALL
JOINT TYPESCARF-PERIPHERAL OVERALL
SUBSTITUTES & CROSS-REFERENCES 10
8120CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S1E10069 ITEM 47Reference document
Same NSN cross-reference
Reference document — Secondary reference
S1E10074 ITEM 52CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S1E10076 ITEM 52Reference document
Same NSN cross-reference
Reference document — Secondary reference
S1E10069 ITEM 47CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S1E10074 ITEM 52Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M8791/1-120?
M8791/1-120 is a RETAINER,PACKING.
What parts can replace M8791/1-120?
There are 10 known substitutes for M8791/1-120: 8120CP, S1E10069 ITEM 47, S1E10074 ITEM 52CP and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M8791/1-120?
M8791/1-120 is cataloged in the U.S. Government catalog under NSN 5330-01-020-9508. 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.