PartsTable
Technical Data Sheet
Download PDF

B831-6400-74 — BUMPER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

B831-6400-74: BUMPER.

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER, overall_height: 0.280 INCHES NOMINAL IN, style_designator: FLAT TOP, end_item_identification: PAWL ASSEMBLY,RAMMER,CARGO BAY, outside/top_flange_diameter: 0.250 INCHES NOMINAL IN, material_document_and_classification: MIL-R-6855, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-503-1039, 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
B831-6400-74
NSN: 5340-01-503-1039
FSC: 5340 — Hardware, Commercial
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialRUBBER
overall_height0.280 INCHES NOMINAL IN
style_designatorFLAT TOP
end_item_identificationPAWL ASSEMBLY,RAMMER,CARGO BAY
outside/top_flange_diameter0.250 INCHES NOMINAL IN
material_document_and_classificationMIL-R-6855, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-503-1039
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B831-6400-74 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
•
OUTSIDE/TOP FLANGE DIAMETER: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT TOP
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-6855, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.280 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER0.250 INCHES NOMINAL IN
STYLE DESIGNATORFLAT TOP
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-6855, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
END ITEM IDENTIFICATIONPAWL ASSEMBLY,RAMMER,CARGO BAY
MATERIALRUBBER
SUBSTITUTES & CROSS-REFERENCES 1
7409747Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy B831-6400-74?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is B831-6400-74?
B831-6400-74 is a BUMPER.
What parts can replace B831-6400-74?
There is 1 known substitute for B831-6400-74: 7409747. Substitute compatibility should be verified for your specific system.
What is the NSN for B831-6400-74?
B831-6400-74 is cataloged in the U.S. Government catalog under NSN 5340-01-503-1039. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — B831-6400-74

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.