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Technical Data Sheet
PartsTable / COMPONENT / B5256PC2666
B5256PC2666 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: ASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL, hole_diameter: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 2.500 INCHES NOMINAL IN, overall_length: 2.500 INCHES NOMINAL IN, style_designator: NON-CIRCULAR, aperture_diameter: 1.406 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-559-2490, 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
B5256PC2666
NSN: 5330-00-559-2490
FSC: 5330
CAGE: 24785 — VICKERS INC (USA)
SPECIFICATIONS
materialASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
hole_diameter0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width2.500 INCHES NOMINAL IN
overall_length2.500 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
aperture_diameter1.406 INCHES NOMINAL IN
bolt_hole_quantity4
outside_corner_radius0.250 INCHES NOMINAL IN
cross-sectional_thickness0.016 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-A-17472 MIL SPEC ALL MATERIAL RESPONSES OVERALL
outside_edge_to_bolt_hole_center_distance_along_width0.344 INCHES NOMINAL IN
NSN5330-00-559-2490
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B5256PC2666 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 TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH: 1.812 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
BOLT HOLE QUANTITY: 4
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-A-17472 MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: NON-CIRCULAR
•
MATERIAL: ASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
•
OUTSIDE CORNER RADIUS: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH1.812 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OVERALL LENGTH2.500 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-A-17472 MIL SPEC ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORNON-CIRCULAR
MATERIALASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
OUTSIDE CORNER RADIUS0.250 INCHES NOMINAL IN
OVERALL WIDTH2.500 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.016 INCHES NOMINAL IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH0.344 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
J3356Interchangeable
interchangeable cross-reference
interchangeable
9366Interchangeable
interchangeable cross-reference
interchangeable
2666Interchangeable
interchangeable cross-reference
interchangeable
D3AZ-2004-DInterchangeable
interchangeable cross-reference
interchangeable
D3A2-200-DInterchangeable
interchangeable cross-reference
interchangeable
K27J809-20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B5256PC2666?
B5256PC2666 is a GASKET.
What parts can replace B5256PC2666?
There are 13 known substitutes for B5256PC2666: J3356, 9366, 2666 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B5256PC2666?
B5256PC2666 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-559-2490. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026