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PartsTable / COMPONENT / GB505B-3
GB505B-3 ✓ 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 hole_diameter: 0.125 INCHES NOMINAL IN, overall_height: 0.313 INCHES NOMINAL IN, style_designator: DONUT TOP COUNTERBORED, first_counterbore_depth: 0.156 INCHES NOMINAL IN, first_counterbore_diameter: 0.250 INCHES NOMINAL IN, outside/top_flange_diameter: 0.625 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 5340-00-558-4424, 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
GB505B-3
NSN: 5340-00-558-4424
FSC: 5340
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
hole_diameter0.125 INCHES NOMINAL IN
overall_height0.313 INCHES NOMINAL IN
style_designatorDONUT TOP COUNTERBORED
first_counterbore_depth0.156 INCHES NOMINAL IN
first_counterbore_diameter0.250 INCHES NOMINAL IN
outside/top_flange_diameter0.625 INCHES NOMINAL IN
specification/standard_data26512-GB505B-3 MANUFACTURERS SPECIFICATION
NSN5340-00-558-4424
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: GB505B-3 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-GB505B-3 MANUFACTURERS SPECIFICATION
•
HOLE DIAMETER: 0.125 INCHES NOMINAL IN
•
FIRST COUNTERBORE DEPTH: 0.156 INCHES NOMINAL IN
•
STYLE DESIGNATOR: DONUT TOP COUNTERBORED
•
FIRST COUNTERBORE DIAMETER: 0.250 INCHES NOMINAL IN
•
OUTSIDE/TOP FLANGE DIAMETER: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.313 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA26512-GB505B-3 MANUFACTURERS SPECIFICATION
HOLE DIAMETER0.125 INCHES NOMINAL IN
FIRST COUNTERBORE DEPTH0.156 INCHES NOMINAL IN
STYLE DESIGNATORDONUT TOP COUNTERBORED
FIRST COUNTERBORE DIAMETER0.250 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
2-197Interchangeable
interchangeable cross-reference
interchangeable
10682611Interchangeable
interchangeable cross-reference
interchangeable
E121109Interchangeable
interchangeable cross-reference
interchangeable
BAC1503-1509Interchangeable
interchangeable cross-reference
interchangeable
1464708Interchangeable
interchangeable cross-reference
interchangeable
327C982H04Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GB505B-3?
GB505B-3 is a BUMPER.
What parts can replace GB505B-3?
There are 11 known substitutes for GB505B-3: 2-197, 10682611, E121109 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GB505B-3?
GB505B-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-558-4424. 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