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PartsTable / COMPONENT / GB505B1
GB505B1 ✓ 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 SYNTHETIC, hole_diameter: 0.156 INCHES NOMINAL IN, overall_height: 0.375 INCHES NOMINAL IN, style_designator: DONUT TOP COUNTERBORED, fastening_device_size: NO. 8-32 MACHINE SCREW, fastening_device_type: MACHINE SCREW.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-818-5682, 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
GB505B1
NSN: 5340-00-818-5682
FSC: 5340
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
hole_diameter0.156 INCHES NOMINAL IN
overall_height0.375 INCHES NOMINAL IN
style_designatorDONUT TOP COUNTERBORED
fastening_device_sizeNO. 8-32 MACHINE SCREW
fastening_device_typeMACHINE SCREW
first_counterbore_depth0.188 INCHES NOMINAL IN
first_counterbore_diameter0.281 INCHES NOMINAL IN
outside/top_flange_diameter0.750 INCHES NOMINAL IN
specification/standard_data26512-GB505B1 MANUFACTURERS SPECIFICATION
NSN5340-00-818-5682
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: GB505B1 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
•
HOLE DIAMETER: 0.156 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
SPECIFICATION/STANDARD DATA: 26512-GB505B1 MANUFACTURERS SPECIFICATION
•
FIRST COUNTERBORE DEPTH: 0.188 INCHES NOMINAL IN
•
FASTENING DEVICE SIZE: NO. 8-32 MACHINE SCREW
•
FASTENING DEVICE TYPE: MACHINE SCREW
•
STYLE DESIGNATOR: DONUT TOP COUNTERBORED
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.156 INCHES NOMINAL IN
OVERALL HEIGHT0.375 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
SPECIFICATION/STANDARD DATA26512-GB505B1 MANUFACTURERS SPECIFICATION
FIRST COUNTERBORE DEPTH0.188 INCHES NOMINAL IN
FASTENING DEVICE SIZENO. 8-32 MACHINE SCREW
FASTENING DEVICE TYPEMACHINE SCREW
STYLE DESIGNATORDONUT TOP COUNTERBORED
OUTSIDE/TOP FLANGE DIAMETER0.750 INCHES NOMINAL IN
FIRST COUNTERBORE DIAMETER0.281 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
4969Interchangeable
interchangeable cross-reference
interchangeable
0261Interchangeable
interchangeable cross-reference
interchangeable
0C265Interchangeable
interchangeable cross-reference
interchangeable
21-98Interchangeable
interchangeable cross-reference
interchangeable
CH126-5HInterchangeable
interchangeable cross-reference
interchangeable
CH126-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GB505B1?
GB505B1 is a BUMPER.
What parts can replace GB505B1?
There are 14 known substitutes for GB505B1: 4969, 0261, 0C265 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GB505B1?
GB505B1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-818-5682. 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