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PartsTable / COMPONENT / BUT-3263
BUT-3263 ✓ 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 BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER, overall_height: 0.438 INCHES NOMINAL IN, groove_diameter: 0.250 INCHES NOMINAL IN, style_designator: DOUBLE FLANGE, top_flange_width: 0.188 INCHES NOMINAL IN, bottom_flange_width: 0.125 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 5340-00-480-3905, 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
BUT-3263
NSN: 5340-00-480-3905
FSC: 5340
CAGE: 54481 — RUSSELL INDUSTRIES INC DBA RUSSELL INDUSTRIES INC (USA)
SPECIFICATIONS
materialRUBBER
overall_height0.438 INCHES NOMINAL IN
groove_diameter0.250 INCHES NOMINAL IN
style_designatorDOUBLE FLANGE
top_flange_width0.188 INCHES NOMINAL IN
bottom_flange_width0.125 INCHES NOMINAL IN
bottom_flange_diameter0.312 INCHES NOMINAL IN
outside/top_flange_diameter0.438 INCHES NOMINAL IN
specification/standard_data26512-GB505MI MANUFACTURERS SPECIFICATION
NSN5340-00-480-3905
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: BUT-3263 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
•
SPECIFICATION/STANDARD DATA: 26512-GB505MI MANUFACTURERS SPECIFICATION
•
TOP FLANGE WIDTH: 0.188 INCHES NOMINAL IN
•
GROOVE DIAMETER: 0.250 INCHES NOMINAL IN
•
BOTTOM FLANGE WIDTH: 0.125 INCHES NOMINAL IN
•
MATERIAL: RUBBER
•
OUTSIDE/TOP FLANGE DIAMETER: 0.438 INCHES NOMINAL IN
•
BOTTOM FLANGE DIAMETER: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIFICATION/STANDARD DATA26512-GB505MI MANUFACTURERS SPECIFICATION
TOP FLANGE WIDTH0.188 INCHES NOMINAL IN
GROOVE DIAMETER0.250 INCHES NOMINAL IN
BOTTOM FLANGE WIDTH0.125 INCHES NOMINAL IN
MATERIALRUBBER
OUTSIDE/TOP FLANGE DIAMETER0.438 INCHES NOMINAL IN
BOTTOM FLANGE DIAMETER0.312 INCHES NOMINAL IN
OVERALL HEIGHT0.438 INCHES NOMINAL IN
STYLE DESIGNATORDOUBLE FLANGE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
3FT31Interchangeable
interchangeable cross-reference
interchangeable
365948015Interchangeable
interchangeable cross-reference
interchangeable
3522Interchangeable
interchangeable cross-reference
interchangeable
831-63-811Interchangeable
interchangeable cross-reference
interchangeable
318M0007P001Interchangeable
interchangeable cross-reference
interchangeable
3263Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BUT-3263?
BUT-3263 is a BUMPER.
What parts can replace BUT-3263?
There are 16 known substitutes for BUT-3263: 3FT31, 365948015, 3522 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BUT-3263?
BUT-3263 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-480-3905. 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