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MILC10387B ✓ 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 PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL, hardness_rating: 35.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL, peripheral_diameter: 7.344 INCHES MINIMUM AND 7.406 INCHES MAXIMUM IN, center_hole_diameter: 6.281 INCHES MINIMUM AND 6.343 INCHES MAXIMUM IN, cross-sectional_height: 1.110 INCHES MINIMUM AND 1.172 INCHES MAXIMUM IN, cross-sectional_shape_style: SPECIAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-141-4225, 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
MILC10387B
NSN: 5330-00-141-4225
FSC: 5330
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
hardness_rating35.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
peripheral_diameter7.344 INCHES MINIMUM AND 7.406 INCHES MAXIMUM IN
center_hole_diameter6.281 INCHES MINIMUM AND 6.343 INCHES MAXIMUM IN
cross-sectional_height1.110 INCHES MINIMUM AND 1.172 INCHES MAXIMUM IN
cross-sectional_shape_styleSPECIAL
material_document_and_classificationMIL-R-2765 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-141-4225
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MILC10387B 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
•
CENTER HOLE DIAMETER: 6.281 INCHES MINIMUM AND 6.343 INCHES MAXIMUM IN
•
CROSS-SECTIONAL HEIGHT: 1.110 INCHES MINIMUM AND 1.172 INCHES MAXIMUM IN
•
HARDNESS RATING: 35.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-2765 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
PERIPHERAL DIAMETER: 7.344 INCHES MINIMUM AND 7.406 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: SPECIAL
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER6.281 INCHES MINIMUM AND 6.343 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT1.110 INCHES MINIMUM AND 1.172 INCHES MAXIMUM IN
HARDNESS RATING35.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-2765 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
PERIPHERAL DIAMETER7.344 INCHES MINIMUM AND 7.406 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLESPECIAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
77A1-1/2INInterchangeable
interchangeable cross-reference
interchangeable
1025-30108 PC8Interchangeable
interchangeable cross-reference
interchangeable
77A1-1-2Interchangeable
interchangeable cross-reference
interchangeable
100SERIES4INGR00VETYPE2BUTYLInterchangeable
interchangeable cross-reference
interchangeable
77DTInterchangeable
interchangeable cross-reference
interchangeable
A-A-52598Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILC10387B?
MILC10387B is a PACKING,PREFORMED.
What parts can replace MILC10387B?
There are 22 known substitutes for MILC10387B: 77A1-1/2IN, 1025-30108 PC8, 77A1-1-2 and 19 more. Substitute compatibility should be verified for your specific system.
Is MILC10387B still available?
MILC10387B is currently cancelled.
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Last verified: July 2026