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Technical Data Sheet

M8791/1-328 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M8791/1-328: RETAINER,PACKING.

The RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL, joint_type: SCARF-PERIPHERAL OVERALL, peripheral_diameter: 2.239 INCHES NOMINAL IN, center_hole_diameter: 1.872 INCHES MINIMUM AND 1.874 INCHES MAXIMUM IN, cross-sectional_height: 0.086 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN, cross-sectional_shape_style: SQUARE/RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-396-1191, 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
M8791/1-328
NSN: 5330-01-396-1191
NIINs: 013961191, 014241356
FSC: 5330 — Packing and Gasket Materials
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
joint_typeSCARF-PERIPHERAL OVERALL
peripheral_diameter2.239 INCHES NOMINAL IN
center_hole_diameter1.872 INCHES MINIMUM AND 1.874 INCHES MAXIMUM IN
cross-sectional_height0.086 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationMIL-R-8791/1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-396-1191
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M8791/1-328 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: 0.065 INCHES MINIMUM AND 0.075 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: 2.251 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.887 INCHES MINIMUM AND 1.889 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.065 INCHES MINIMUM AND 0.075 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 DIAMETER2.251 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.887 INCHES MINIMUM AND 1.889 INCHES MAXIMUM IN
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
SUBSTITUTES & CROSS-REFERENCES 6
AS879/1Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS28774-328Reference document
Same NSN cross-reference
Reference document — Secondary reference
3029-0001-3 FIND 18Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
1002-0030-328CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MS28774-328CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3029-0001-3 FIND 18CPSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 M8791/1-328?
M8791/1-328 is a RETAINER,PACKING.
What parts can replace M8791/1-328?
There are 6 known substitutes for M8791/1-328: AS879/1, MS28774-328, 3029-0001-3 FIND 18 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M8791/1-328?
M8791/1-328 is cataloged in the U.S. Government catalog under NSN 5330-01-396-1191. 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.