PartsTable
Technical Data Sheet

M8791/1-026 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M8791/1-026: RETAINER,PACKING.

The RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL, joint_type: SCARF-PERIPHERAL BOTH ENDS CUT, peripheral_diameter: 1.359 INCHES MINIMUM AND 1.365 INCHES MAXIMUM IN, center_hole_diameter: 1.255 INCHES MINIMUM AND 1.257 INCHES MAXIMUM IN, cross-sectional_height: 0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN, cross-sectional_shape_style: SQUARE/RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-286-4697, 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
M8791/1-026
NSN: 5330-01-286-4697
NIINs: 012864697, 013517967
FSC: 5330 — Packing and Gasket Materials
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
joint_typeSCARF-PERIPHERAL BOTH ENDS CUT
peripheral_diameter1.359 INCHES MINIMUM AND 1.365 INCHES MAXIMUM IN
center_hole_diameter1.255 INCHES MINIMUM AND 1.257 INCHES MAXIMUM IN
cross-sectional_height0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationMIL-R-8791/1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-286-4697
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M8791/1-026 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
•
FSC APPLICATION DATA: 5 VALVE MANIFOLD
•
CROSS-SECTIONAL HEIGHT: 0.048 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: 1.376 INCHES MINIMUM AND 1.382 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATA5 VALVE MANIFOLD
CROSS-SECTIONAL HEIGHT0.048 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 DIAMETER1.376 INCHES MINIMUM AND 1.382 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.255 INCHES MINIMUM AND 1.257 INCHES MAXIMUM IN
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
SUBSTITUTES & CROSS-REFERENCES 8
M8791/1-026CPReference document
Same NSN cross-reference
Reference document — Design control — primary reference
MS28774-026CPReference document
Same NSN cross-reference
Reference document — Secondary reference
MS28774-026Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-R-8791/1CPReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-R-8791/1-026CPReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-R-8791/1-026Reference 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 M8791/1-026?
M8791/1-026 is a RETAINER,PACKING.
What parts can replace M8791/1-026?
There are 8 known substitutes for M8791/1-026: M8791/1-026CP, MS28774-026CP, MS28774-026 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M8791/1-026?
M8791/1-026 is cataloged in the U.S. Government catalog under NSN 5330-01-286-4697. 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.